Insect Management in Drip Irrigation John Palumbo Yuma Agricultural Center 1 Insect Management in Drip Irrigation Insect Management in Drip Irrigation Advantages Advantages • Water / Nutrient management • Water / Nutrient management • Access to field with ground equipment Ellsworth 1999 Insect Management in Drip Irrigation Chemigation Advantages • Water / Nutrient management • Access to field with ground equipment • • • • Vapam Cloropicrin Vydate MSR • Ability to Chemigate Soil Application • Pre-plant bed shaping • At-planting 2 Chemigation Drip irrigation is the optimal application method for Admire and Platinum Surface drip Sub-surface drip Influence of Drip Irrigation on Imidicloprid Efficacy & Whitefly Control Yuma, AZ - June 4, 2001 Nymphs / cm 60 55DAT DAT 2 40 Sub-surface Drip 30 Surface Drip 20 10 0 Admire Actara 16 oz Check Untreated Platinum Confidor 11 oz Green Peach Aphid Control with Admire in Lettuce via Drip Chemigation Wet Date – Nov 17 Mean aphids per plant 200 150 100 25 20 15 10 5 0 Yuma Ag Center, Spring 1996 200 Admire 5 oz Admire 10 oz Admire 15 oz Admire 20 oz Untreated 12/30 1/14 Lettuce Aphid Efficacy In Drip Irrigated Romaine 150 100 1/28 2/12 2/26 3/11 25 20 15 10 5 0 3 Lettuce Aphid Efficacy on Drip Romaine Lettuce – Spring 2002 Lettuce Aphid Efficacy on Drip Romaine Lettuce – Spring 2001 Romaine 15 20 15 10 Injection 5 10 5 0 0 6 Mar 12 Mar 25 Mar 4 Apr 11 Apr 18 Apr 300 Mean Lettuce Aphids /Plant 20 25 Admire 16 oz Platinum 8 oz Dinotefuron 0.4 lb ai Orthene 97 - 1 lb Check Harvest Mean aphids / plant 25 250 Admire 12 oz (1) ; 6 oz (2) Platinum 7 oz (1) ; 4 oz (2) Pirimor 6 oz Untreated 200 150 100 Drip # 1 Drip # 2 Drip # 1 Drip # 1 50 0 Feb 20 March 8 March 22 April 2 April 16 Insect Management in Drip Irrigation Uniform Chemigation is Critical for Effective Insect Management -You need to have the injection period be long enough to move the chemical through the entire drip system AND -You need to have a post-injection period of clean irrigation water. Insect Management in Drip Irrigation Uniform Chemigation: The injection period should be at least as long as it takes water / chemical to move from the head to tail-end of the drip system. Twice as long is better. The post-injection, clean water irrigation period should be at least as long as it takes water / chemical to move from the head to tail-end of the drip system. Twice as long is definitely better. Timing of Admire / Platinum Application • The easiest way to determine travel times of chemicals (and water) through a drip system: » Inject chlorine (at about 10 - 20 ppm) into the system and follow its movement through the drip system. » It is easy to spot when chlorine reaches any point by testing the water with a pool/spa test kit. 4 Neonicotinoids For Flea Beetle Control Fall Melon Trial Brown Ranch Somerton, AZ Fall 2002 Pale-stripped Flea Beetle Nymphs / cm 10 Admire Platinum Check 8 6 * Admire 16 oz 4 * Platinum 8 oz 2 0 7 DAT 21 DAT 35 DAT 50 DAT Desert Flea Beetle 65 DAT Flea Beetle Control on Melons Flea Beetle Control on Melons Fall 2001- Furrow Irrigated Fall 2002 – Drip Irrigated 14 DAT a % Damaged Plants 80 Coty. Cotyledons Leaves 60 % Damaged Plants 60 50 14 DAT Leaves Cotyledons 40 40 Leaves b 20 0 a 30 b b 20 c 10 c c c 0 Admire 16 oz Platinum 8 oz Platinum 5 oz dinotefuron Untreated Admire Platinum Dinotefuron Untreated 5