The University of Maryland Extension Agriculture and Food Systems and Environment and Natural Resources Focus Teams proudly present this publication for commercial vegetable and fruit industries. Volume 6 Issue 6 September 11, 2015 Vegetable Crop Insect Update By Joanne Whalen DE Extension IPM Specialist jwhalen@udel.edu Cole Crops Continue to sample for cabbage looper, diamondback larvae, beet and fall armyworms and Harlequin bug. Although the pyrethroids will provide control of Harlequin bugs they are not effective on beet armyworm or diamondback. Be sure to scout and select controls options based on the complex of insects present in the field. Lima Beans Continue to scout for stink bugs, lygus bugs, soybean looper and corn earworm. If present in the mix, be sure to select a material labeled for soybean loopers. Melons Continue to scout all melons for aphids and cucumber beetles and rind feeding caterpillars. Treatments for aphids should be applied before populations explode and leaf curling occurs. In addition, be sure to read the label regarding when a penetrating surfactant is needed in order to achieve effective control. Peppers At this time of year, aphids, corn borer, corn earworm, beet armyworm and fall armyworm are all potential problems in peppers. Be sure to select the material that will control the complex of insects present in the field. Spinach Webworms and beet armyworms moths continue to be active at this time and controls need to be applied when worms first hatch and before they have moved deep into the hearts of the plants. Also, remember that both insects can produce webbing on the plants. Generally, at least 2 applications are needed to achieve control of webworms and beet armyworm. Available at: https://extension.umd.edu/sites/default/files/_docs/IPMGui deVegetables2009.pdf Gold Flecking on Tomatoes By Jerry Brust Extension IPM Vegetable Specialist University of Maryland jbrust@umd.edu “Why do I still have gold fleck on my tomatoes when I have sprayed repeatedly for thrips? I must have a resistant thrips population.” I have heard growers tell me this a few times this year. When I ask why they think they have a thrips problem since they usually tell me they do not see any thrips it is because of the gold flecking (fig 1) they see on their tomatoes at harvest. While gold fleck on tomatoes can be caused by a moderately high thrips population, at this time of year the explanation of the cause of flecking is more likely due to the weather conditions we have been having. I have conducted research and read many other studies on gold flecking over the last 5 years and they all point to 3 main possible causes. The most likely and common one is when we have high daytime (>88oF) and nighttime (>68oF) temperatures combined with high humidity (dew point temperatures >68o F) and that is what we are experiencing now and have been from July through August. The second most common cause is high populations of either two spotted spider mites (more common) or thrips (less common) feeding on the plant. High populations are when the mites or thrips feeding on the leaves cause white speckles (stippling) on the leaves Local Governments • U.S. Department of Agriculture It is the policy of the University of Maryland, College of Agriculture and Natural Resources, Maryland Agricultural Experiment Station, and University of Maryland Extension that all persons have equal opportunity and access to programs and facilities without regard to race, color, gender, religion, national origin, sexual orientation, age, marital or parental status, or disability. Fig. 2 Moderate flecking on tomato leaves caused by twospotted spider mite feeding. of a plant (figs 2 and 3). Sometimes the damage becomes so bad that the edge of a leaf will turn brown and die because of the feeding (fig 4). Fig. 1 Gold flecking on red round and plum tomatoes. Fig. 3 Heavy feeding damage on tomato leaves caused by twospotted spider mite feeding. Fig. 4 Very heavy TSSM feeding on a tomato leaf. Gold flecking is not from direct mite or thrips feeding on the fruit itself—it can’t be because gold flecking can be induced in tomatoes with no thrips or mites being present with high temperatures and humidity. Mites and thrips CAN feed directly on tomato fruit and this damage can superficially look like gold flecking. But the actual ‘fleck’ in gold flecking is caused by calcium salt crystals that form inside a cell. Mites or thrips damage the fruit to get at the juices and leave damaged cells behind (fig 4). If you rub you finger or thumb lightly over gold flecked fruit it will feel smooth, but rub it over thrips or mite damaged fruit and it feels rough. At times if mite populations are high you could get both gold flecking and direct mite feeding on a single fruit. The third possibility that is pretty rare for field production tomatoes is excessive levels of calcium and phosphorous, but these levels have to be extremely high and rarely if ever occur under field conditions. They do occur, though, at times in hydroponic production systems where gold flecking is considered more of a nutrient imbalance. This is just a quick summary of the work that has been done on this very difficult-to-pin-down problem. So if you have been spraying for thrips because of gold flecking and you are still seeing it, STOP SPRAYING and check for 1. Thrips and 2. Two-spotted spider mites. You might find a few of each of these, especially the mites as they like hot dry weather, exactly what we have been having, but look at the foliage to see if there is white speckling over most of the middle and top half of the plant. If it is mites Oberon or Portal (both have a 1-day phi) or Acramite (with a 3-day phi) can be used. But chances are you have only low levels of either of these two pests and it is more likely because of our weather conditions that you continue to see gold flecking on your tomatoes. 2 Fig. 5 Comparison of gold flecking on the left and mite or thrips feeding on the right. Botrytis impacts are not Sour rot of grapes. typically severe unless you get a lot of infested fruit, which can provide secondary inoculum to infect new fruit. We manage for this by applying bloom-time sprays to protect flowers (which are the most susceptible) and reducing humidity in the canopy through thinning, but this will not control the disease if berries become wounded during an infection period, since the pathogen easily enters fruit through wounds. Sour rot in grapes is primarily a woundmediated pathogen, and wound-management is one of the primary strategies to manage this disease. Wounds can be caused by mechanical injury (rubbing, sun damage) or by insects. In small fruits, spotted wing drosophila (SWD) is one new candidate on the scene that is capable of wounding fruit. SWD makes wounds as it lays its eggs, and this may facilitate fruit rot development if not kept in check. For a review of SWD management, please see the recent special alert article (special alert #2—July 10, 2015) in the UMD Vegetable and Fruit Headline News. Two of Our Least Favorite Fall Pest Problems May be Consorting Together: Fruit Rot and Spotted Wing Drosophila in Fall Berries By Cassandra Swett, Department of Plant Science and Landscape Architecture University of Maryland We are conducting studies at the University of Maryland to evaluate whether SWD activity can facilitate outbreaks of Botrytis fruit rot in fall raspberries and facilitate both Botrytis and sour rot in grapes in the midAtlantic. In raspberries, we are trapping SWD at moderate to high levels, we have confirmed larval infestation in fruit, and we have found SWD larvae in Botrytis infected fruit (arrow), indicating that SWD may initiate fruit rot development. Studies are underway to better understand the importance of this potential association. In grapes, studies in other regions indicate that SWD can initiate sour rot development, and may play a similar role in facilitating Botrytis fruit rot. SWD was present and moderate to high levels in vineyard monitoring trials this year, but we are currently working to see if we can confirm larval infestation in grapes. SWD is likely only able to attack very thin-skinned grape varieties (penetration force of less than 40cN). Botrytis and sour rot are just starting to appear in most vineyards our region, and we will be looking to see if there is an association with SWD. clswett@umd.edu & By Kelly Hamby Department of Entomology University of Maryland kahamby@umd.edu Warm rains in the spring and some rains and heavy dews in late summer have made this a bad year for insects and fruit rots, and we continue to see problems going into fall in berry crops. The main fruit rot issues are currently Botrytis in raspberries, and both Botrytis and sour rot in grapes. We have reason to suspect that insects, particularly spotted wing drosophila, may be contributing to the severity of fruit rot damage we are seeing this fall. Botrytis fruit rot on raspberries and grapes. For more information and updates, please refer to the UMD Berry Pathology Twitter site at: https://twitter.com/berry_pathology 3 How Late is Too Late for Pumpkins to Color? and 0-day PHI. The amount of chlorothalonil in Zing! is an intermediate rate (1.18 lb/A chlorothalonil) of the labeled rate range for downy mildew in products with just chlorothalonil (1.125-1.5 lb/A). Chlorothalonil is labeled for use at a higher rate (1.5-2.25) to manage several other diseases including powdery mildew. Growers trying to manage these diseases as well as downy mildew should apply additional Bravo to bring the amount of chlorothalonil up to the higher rate. This necessitates applying Bravo at less than lowest labeled rate. It is acceptable to apply a pesticide at less than labeled rates for agricultural purposes only, unless the labeling specifically prohibits such use. There is not a prohibiting statement on the Bravo label. To obtain an application rate of 1.5-2.25 lb/A chlorothalonil, tank mix Bravo WeatherStik at 0.43-1.43 pts/A with Zing!. Zing! is labeled for use at 36 fl ozs/A; maximum seasonal use is 8 applications with no more than 2 sequential applications permitted before it must be alternated with another fungicide.” By Gordon Johnson DE Extension Vegetable & Fruit Specialist gcjohn@udel.edu Delayed fruit set in pumpkin can be caused by many factors including late planting, heat and water stress, poor pollination and excess fertility (too much N). When set is delayed until August, the question is will the pumpkin develop and color in time for sales. Under favorable summer growing conditions pumpkins will start to color about 4 weeks after fruit set and will be completely colored by 7 weeks after set. If fruit set is delayed until August, reduced day lengths and cooler temperatures may increase the time for full color development. Varietal differences in days to maturity also come into play. In research at Purdue University, pumpkins that set in August were tagged and then evaluated for maturity in October. They found that for flowers that opened between August 10 and August 21, at least 70% produced pumpkins that were either turning or fully orange by October 2 and 10, respectively. The remaining 20 to 30% either never set a fruit, or the fruit was still immature at the time of harvest. By Stanton A. Gill Extension Specialist in IPM and Entomology University of Maryland Extension Sgill@umd.edu www.Extension.umd.edu/ipm - IPM Alerts This indicates that pumpkins set in mid-August will be ready for October sales. In fields with delayed set, it will be critical to keep vines healthy through September. This will mean additional fungicide sprays through the month with special attention being paid to powdery mildew and downy mildew. Sept 11, 2015 Hot and Droughty Continues Two weeks ago I wrote that NOAA is predicting a hotter and drier than normal September and it looks like their prediction was “on the money.” On Labor Day Monday I was mountain biking on the canal from Seneca Lake to Great Falls to look at the ripening of Paw Paws. I was surprised on how stressed the Paw Paw trees looked along the canal. Many of the leaves were showing leaf scorch from the extended dry weather. Yes, some of the wild Paw Paw are ripening but I saw several that were dropping prematurely from the dry conditions. This weather is great, with all of the sunshine, but it will make watering of new transplants this fall very challenging. Keep the water coming, especially with trickle irrigation systems, until the weather breaks. Fungicide Product News Kate Everts Vegetable Pathologist University of Delaware and University of Maryland keverts@umd.edu ZeroTol 2.0 is a hydrogen dioxide and peroxyacetic acid product that has been added to the OMRI products list. ZeroTol is a broad-spectrum bactericide/fungicide that is registered to manage plant pathogens on greenhouse-grown fruits, vegetables and herbs. Hot Weather and Mite Activity We have gone most of the summer without reporting on spider mites. From April through July we had frequent enough rain storms that suppressed most mite populations. The outcome has been that we saw just a few isolated cases in nurseries and landscapes in the first ¾ of the summer. Now that we have moved into hot and dry weather the spider mite populations are flourishing. We are finding two-spotted spider mites on a wide range of plants including many herbaceous perennials. Adults of two-spotted spider mites have two dark spots on the body. Southern red mites are being found on mainly Meg McGrath at Cornell provided the following information on a new product, Zing!, that may be useful for managing fall cucurbits: “Zing! is a new fungicide that has the same active ingredient with targeted activity for oomycete pathogens as Gavel but is applied at a slightly higher rate (0.2 lbs/A zoxamide versus 0.12-0.17 lbs/A with an application of Gavel, depending on the rate used). Both fungicides also contain a protectant. Gavel contains mancozeb and thus has 48-hr REI and 5-day PHI. Zing! contains chlorothalonil and thus has 12-hr REI 4 oriental holly species. Southern red mites are reddish brown and darker than most red spider mites found on woody ornamentals. The southern red mite is usually active in spring and again in the late summer when we start to have cool nights and warm days. The southern red mite can also be found on boxwood, hibiscus and cotoneaster. Monitoring: Use a light colored paper on a clipboard and place it under branches and tap them sharply. The mites, if present, should be easily seen running around on the light colored surface. Control: There are several products labeled for mite control including Akari, Aza-Direct, Abamectin (Avid), and Forbid. but it had cut their losses tremendously. I think this disruption pheromone has potential for use in Maryland nurseries that are troubled with peachtree borer in cherry laurel, peaches or ornamental plums. If you want to work with me in 2016, contact me at sgill@u,md.edu or 410-868-9400. I have been using the Isomate pheromone dispensers for oriental fruit moth and codling moth in my orchard since 2011 and I have experienced very little damage from either of these pests. The scout at Hollabaugh’s orchard said they had been using the oriental fruit moth and codling moth disruption pheromone for over 7 years and it was very effective in reducing their damage from these two pest. The use of disruption pheromones would be best done in a nursery setting. I don’t think it would be as cost effective in a residential landscape, but I could be wrong. Using Disruption Pheromones Last week I mentioned I would talk about using disruption pheromones to deal with certain insects. Back in late spring I wrote an article about controlling the peachtree borer in cherry laurel. With the growing popularity of cherry laurels we have seen a large increase in damage form peachtree borer. Robin Rosetta, Oregon University Extension, picked up on my article and sent me an e-mail saying that they had been working with a nursery in Oregon that was trying to control peachtree borer with disruption pheromones. Pheromones are airborne chemicals which are emitted to attract the opposite sex. Pheromones are believed to be detected on an instinctual, subconscious level. In other words, you don’t know that you’re receiving them. There is a commercial product called Isomate which is an insect pheromone that is impregnated into a plastic stick with a metal core called a twist tie. The plastic twist tie is twisted around tree branches at approximately 4 to 10 ft high and about 9 ft apart in the nursery. The twist tie emits pheromone for 120 -180 days. The pheromone twist ties come containing chemicals that mimic the naturally produced pheromone of the female insect species. Isomate is a brand name for several different pheromones for specific insect species. We have used the twist ties for peachtree borer and another for oriental fruit moth. Helping out Pollinators To help out pollinators we need to think what we can use in the nursery and landscape that will provide a good food source. Good food sources helps increase the health of pollinators. For the last 5 years I have written several articles about a spectacular plant called the seven son plant, Heptacodium miconiodes. I first saw this plant in 2002 when I was giving a talk in Chicago at the Morton Arboretum. They called it the mid-west substitute for crape myrtles. It blooms with beautiful white blooms in mid-August to mid-September. I have several planted at my farm in Westminster that I trained into small tree form of about 15 ft. height. For the last 3 weeks honeybees, wasp, and pollinating flies have been hanging out on these flowers. There is so much buzzing going on around the trees it sounds like an electric substation. This plant is an excellent pollen source for pollinators and for predators to obtain nectars during part of the year when there is not an abundance of sources available. I would highly recommend using this plant to help diversify a landscape and help out the pollinators I obtained peachtree disruption pheromone from Isomate Company this spring. The nursery that was planning to work with us on this project made an application of an insecticide that would negate our measuring its impact. I decided to deploy the pheromone at my orchard in Westminster since I suffered damage on cherry and plum trees with 21 trees hit with peachtree borer in 2014. The Isomate disruption pheromone was placed out in early June covering two acres of growing area. I just finished examining the trees on August 16 and found 3 peachtree borer hits on the trees in 2015. CDMS: Pesticide Labels and MSDS On-Line at: http://www.cdms.net/ I spoke with the IPM scout from Hollabaugh Orchard in Biglerville, PA and he said they had been using the peachtree disruption pheromone for over 3 years and they had dramatically reduced the incidence of peachtree borer damage in their orchard. He said it was expensive, 5 The Maryland Rural Enterprise Development Center (MREDC) records from the past year. Additionally, any beginning farmer and rancher may qualify by using the former farm operator's federal farm tax records if the beginning farmer or rancher assumes at least 90 percent of the farm operation • Livestock Producers – RMA removed the previous cap that limited participants to those who received 35 percent or less of their income from livestock production. Producers will now be able to insure up to $1 million worth of animals and animal products. • Expanding Operations – RMA increased the cap on historical revenue for expanding operations to 35 percent from its previous 10 percent to better allow growing farms the opportunity to cover their growth in the insurance guarantee. AG Marketing Alert! Please see the link below on the following information/application for the 2015 CSX Sm all Grants P rogram for Transporting Healthy Food. http://www.conservationfund.org/images/partner/files/2015_CSX_Small _Grants_Program_Application.pdf Ginger S. Myers Marketing Specialist, University of Maryland Extension Director, Maryland Rural Enterprise Development Center VOICE: 301-432-2767 Extension: 338 FAX: 301-432-4089 EMAIL: gsmyers@umd.edu Whole-Farm Revenue Protection includes a wide range of available coverage levels, provides coverage for replanting annual commodities, includes provisions that increase coverage for expanding operations, and allows the inclusion of market readiness costs in the coverage. The policy is tailored for most farms, including farms with specialty or organic commodities (both crops and livestock), or those marketing to local, regional, farmidentity preserved, specialty, or direct markets. The policy covers farms or ranches with up to $8.5 million in insured revenue. USDA Expands Farm Safety Net, Offers Greater Flexibility for Beginning, Organic and Fruit and Vegetable Growers For more information, including product availability, visit the RMA Whole-Farm Web page. Crop insurance is sold and delivered solely through private crop insurance agents. A list of crop insurance agents is available at all USDA Service Centers and online at the RMA Agent Locator. Learn more about crop insurance and the modern farm safety net at www.rma.usda.gov Whole Farm Coverage Now Available in Every County Across the Nation Agriculture Deputy Secretary Krysta Harden today announced that Whole-Farm Revenue Protection insurance will be available in every county in the nation in 2016. The U.S. Department of Agriculture (USDA) is also making changes to the policy to help farmers and ranchers with diversified crops including beginning, organic, and fruit and vegetable growers, better access Whole-Farm Revenue Protection. The University of Maryland Extension Woodland Stewardship Education program serves woodland owners, natural resource professionals and interested citizens. Please consider attending one of these offerings. Additional events are listed on the Event Calendar at http://extension.umd.edu/woodland "Whole-Farm Revenue Protection insurance allows producers who have previously had limited access to a risk management safety net, to insure all of the commodities on their farm at once instead of one commodity at a time," said Deputy Secretary Krysta Harden. "That gives them the option of embracing more crop diversity on their farm and helps support the production of a wider variety of foods." Nature-based Forestry: The Pro Silva Movement in Europe – September 17, 2015, 12:00 pm – 1:00 pm, online USDA also provided additional flexibility to producers by making the following changes, including: • Beginning Farmers and Ranchers – RMA makes it easier for more beginning farmers and ranchers to participate in the program by reducing the required records from five to three historical years, plus farming The next presentation in our WSE Webinars series features Lyle Almond, University of Maryland Forest Stewardship Educator. Lyle will provide an overview of the “Pro Silva” movement that is sweeping across the continent. It promotes continuous cover forestry, which 6 mimics natural forest stand development for optimizing social, ecological, and economic benefits. The webinar will include Lyle’s first-hand experience with the movement through his work in the nation of Slovenia. This webinar is free and will be conducted through Adobe Connect. Registration is requested. To register, go to: http://woodlandwebinarsprosilvamovement.eventbrite.com. Secretary Bartenfelder Announces Record Cover Crop Enrollment Visit our website: http://extension.umd.edu/woodland During the Governor’s Agriculture Day lunch at the 134th Maryland State Fair, Maryland Department of Agriculture Secretary Joe Bartenfelder announced record cover crop program enrollment by Maryland farmers as he applauded the agriculture community for their extraordinary stewardship efforts. For the 2015/2016 Cover Crop Program, 1,835 Maryland farmers requested funding to plant a record 656,170 acres of winter grains. Maryland farmers have exceeded the Watershed Implementation Plan milestone goals in 2011, 2013 and 2015 for cover crops and are on track to exceed the next two year milestone in 2017 with this new record enrollment acreage. Cover crops are one of the most cost-effective means of helping to restore the Chesapeake Bay. The State has allocated $22.5 million for the 2015/2016 program, which is estimated to pay for every certified planted acre in program. Agricultural Law Education Initiative http://umaglaw.org The Potential Impacts of Mandatory Labeling for Genetically Engineered Food in the United States “The State Fair is a chance to remind ourselves of our roots and to see the work that Maryland farmers are doing to create jobs, strengthen our economy, and feed our families. Agriculture contributes $8.25 billion annually to our state and the future of agriculture and our rural economies is strong,” said Governor Hogan. “Our record cover crop announcement is great news for our farmers who continue to voluntarily take strong conservation actions on their farms, diversify their operations and use new technologies as they become available.” “Not only is Maryland’s cover crop program a very attractive and flexible program, it has the potential to do more for the Bay than ever before,” said Agriculture Secretary Bartenfelder. “We commend and thank all farmers who, together, have applied to plant more than half a million acres of small grain crops that protect our soil and water by taking up any remaining nutrients and preventing soil erosion over the winter.” http://www.castscience.org/publications/?the_potential_impacts_of _mandatory_labeling_for_genetically_engineered_f ood_in_the_united_states_qc&show=product&prod uctID=282272 For a chart showing cover crop acres and applications, 2007 to 2015: http://www.mda.maryland.gov/resource_conservation/Docu ments/CC_2015_Poster.pdf For enrollment statistics by county, visit: www.mda.maryland.gov/resource_conservation/Documents/c c_by_county15.16.pdf 7 Reports produced by the Office of Pesticide Programs Annual Reports, Performance Management & Accountability, Pesticide Industry Sales and Usage, Progress Reports, Restricted Use Products Reports Pesticide News Stories Pesticide related articles appearing in news media Publications | Glossary | A-Z Index | Pesticide Regulation The Pesticide Regulation Section administers Maryland's Pesticide Applicator's Law, approves training courses in the handling, storage and use of pesticides, conducts examinations to determine that pesticide applicators are competent to follow prescribed pest control practices, enforces federal laws on the sale and use of pesticides, and investigates pesticide accidents or incidents and consumer complaints on pesticide misuse. Commercial 2015 Vegetable Production Recommendations Maryland EB 236 On-Line at http://extension.umd.edu/sites/default/files/_d ocs/programs/mdvegetables/2015_CommercialV egRecommend_MarylandBook.pdf New! Online Pesticide Licensing and Certification renewal & Pesticide Search Pesticide Regulation • Pesticide Regulation Home • Searchable Pesticide Database • Pesticide Information for Consumers • Pesticide Information for Professionals • Integrated Pest Management (IPM) in Schools • Pesticide Applicator Certification and Business Licensing Requirements To find out more, call Pesticide Regulation at (410) 841-5710. EPA Site Quick Finder About EPA's Pesticides Program Types of Pesticides Frequently Asked Questions Answers to questions from the public. Fact Sheets Information Sources Pesticide Program Reports M ore I nfo & R egistration 8 Rescheduled: 2015 Aronia Twilight Tour September 17th Subscribe to the Terp Farm Newsletter! We'll be sending monthly updates of what we're up to at the Terp Farm - thanks for following along! Terp Farm Newsletter Subscription The 2015 Aronia Twilight Tour has been rescheduled for Thursday, September 17th at 5 PM at the Wye Research and Education Center in Queenstown, MD. This twilight tour will be focused on useful information for both new farmers interested in growing Aronia and for veteran Aronia growers. Whether you are organic or conventional, a veteran Aronia grower or just interested in possibly growing Aronia, this is a program you do not want to miss! RSVP by calling Debby Dant at 410-827-8056 x 115 or Linda Dawkins, x 114. Vegetable & Fruit News A timely publication for the commercial vegetable and fruit industry available electronically in 2015 from April through October on the following dates: April 16; May 14; June 11; July 9; August 13; September 11; and October 22. Published by the University of Maryland Extension Focus Teams 1) Agriculture and Food Systems; and 2) Environment and Natural Resources. Submit Articles to: Editor, R. David Myers, Extension Educator Agriculture and Natural Resources 97 Dairy Lane Gambrills, MD 21054 410 222-3906 myersrd@umd.edu Article submission deadlines for 2015 at 4:30 p.m. on: April 15; May 13; June 10; July 8; August 12; September 9; and October 21. The University of Maryland Extension programs are open to any person and will not discriminate against anyone because of race, age, sex, color, sexual orientation, physical or mental disability, religion, ancestry, national origin, marital status, genetic information, political affiliation, and gender identity or expression. Note: Registered Trade Mark® Products, Manufacturers, or Companies mentioned within this newsletter are not to be considered as sole endorsements. The information has been provided for educational purposes only. 9