CROP AND PEST IDENTIFICATION
for AGRONOMY 105
Demonstrate your ability to identify the following 100 crops, weeds, insects and diseases that are common to
Indiana and the Midwest as a part of Agronomy 105. Utilize the links below, plus the books, live plants,
mounts, and other materials in the Crops Resource Center. Please note that many of the resources go beyond
identification and include life cycles, management options, and other information. You only need to be able to
identify each, and with diseases/insects to know the crops they infect/infest.
20 FIELD CROPS
Identify the following crops and at the seedling, vegetative, and reproductive growth stages
Some General Resources:
http://www.agry.purdue.edu/courses/agry105/forages/forages.htm
http://www.uwyo.edu/plantsciences/uwplant/forages/
Crop
Some Specific Resources
alfalfa
barley
common oats
corn (maize)
cotton
field bean
grain sorghum (milo)
Kentucky bluegrass
orchardgrass
http://www2.ca.uky.edu/agc/pubs/agr/agr175/alfa.htm
http://oregonstate.edu/instruct/css/330/five/BarleyOverview.htm
http://www.uky.edu/Ag/GrainCrops/oat.htm
http://www.agry.purdue.edu/ext/corn/news/timeless/vstagemethods.html
http://www.plantoftheweek.org/week342.shtml
https://plantdatabase.kwantlen.ca/plant/plantDetail/1362
http://www.agry.purdue.edu/courses/agry105/forages/sorghum.htm
http://www2.ca.uky.edu/agc/pubs/agr/agr175/kent.htm
http://www2.ca.uky.edu/agc/pubs/agr/agr175/orch.htm
http://www.uwyo.edu/plantsciences/uwplant/forages/grasses/orchardgrass.html
red clover
http://www2.ca.uky.edu/agc/pubs/agr/agr175/redc.htm
http://www.uwyo.edu/plantsciences/uwplant/forages/legume/red-clover.html
rice
rye
ryegrass
smooth bromegrass
soft red winter wheat
soybean
sugar beet
sunflower
tall fescue
white clover
http://plants.usda.gov/core/profile?symbol=ORSA (click on images tab)
http://plants.usda.gov/core/profile?symbol=sece (click on images tab)
http://www2.ca.uky.edu/agc/pubs/agr/agr175/ryea.htm
http://www.agry.purdue.edu/courses/agry105/forages/sbromegrass.htm
http://www.gipsa.usda.gov/fgis/educout/commgallery/gr_srw.html
http://extension.agron.iastate.edu/soybean/production_growthstages.html
http://www.britannica.com/EBchecked/topic/571957/sugar-beet
http://plants.usda.gov/core/profile?symbol=hean3 (click on images tab)
http://www2.ca.uky.edu/agc/pubs/agr/agr175/tall.htm
http://www2.ca.uky.edu/agc/pubs/agr/agr175/whit.htm
http://plants.usda.gov/core/profile?symbol=TRRE3 (click on images tab)
CROP AND PEST IDENTIFICATION FOR AGRONOMY 105
FALL 2015
40 FIELD CROP WEEDS
Identify the following weeds at seedling, vegetative, and reproductive growth stages. Seed identification is
not required.
Some General Resources:
https://ag.purdue.edu/btny/weedscience/Pages/default.aspx
http://oak.ppws.vt.edu/weedindex.htm
http://courses.missouristate.edu/pbtrewatha/Midwest_Weeds.htm
http://fieldcrop.msu.edu/uploads/documents/Ncr607.pdf
Weed
Some Specific Resources
barnyardgrass
http://oak.ppws.vt.edu/~flessner/weedguide/echcg.htm
http://courses.missouristate.edu/pbtrewatha/barnyardgrass.htm
http://oak.ppws.vt.edu/~flessner/weedguide/siyan.htm
http://weeds.cropsci.illinois.edu/images/Burcucumber/index.htm
http://oak.ppws.vt.edu/~flessner/weedguide/cirar.htm
http://weedid.missouri.edu//weedinfo.cfm?weed_id=64
http://oak.ppws.vt.edu/~flessner/weedguide/steme.htm
http://weedid.missouri.edu//weedinfo.cfm?weed_id=280
http://oak.ppws.vt.edu/~flessner/weedguide/xanst.htm
http://www.ipm.ucdavis.edu/PMG/WEEDS/common_cocklebur.html
http://www.fcps.edu/islandcreekes/ecology/common_milkweed.htm
http://oak.ppws.vt.edu/~flessner/weedguide/ascsy.htm
http://www.fcps.edu/islandcreekes/ecology/common_ragweed.htm
https://oak.ppws.vt.edu/~flessner/weedguide/ambtr.htm
http://www.extension.iastate.edu/publications/pm1786.pdf
http://oak.ppws.vt.edu/~flessner/weedguide/rumcr.htm
http://weeds.cropsci.illinois.edu/images/Curly%20dock/index.htm
http://www.fcps.edu/islandcreekes/ecology/common_dandelion.htm
http://weeds.cropsci.illinois.edu/images/Dandelion/index.htm
http://oak.ppws.vt.edu/~flessner/weedguide/solpt.htm
http://weeds.cropsci.illinois.edu/images/Eastern%20black%20nightshade/
http://www.ipm.ucdavis.edu/PMG/WEEDS/fall_panicum.html
https://oak.ppws.vt.edu/~flessner/weedguide/pandi.htm
http://oak.ppws.vt.edu/~flessner/weedguide/conar.htm
http://weeds.cropsci.illinois.edu/images/Field%20bindweed/index.htm
http://oak.ppws.vt.edu/~flessner/weedguide/thlar.htm
http://weeds.cropsci.illinois.edu/images/Field%20pennycress/index.htm
https://oak.ppws.vt.edu/~flessner/weedguide/setfa.htm
http://courses.missouristate.edu/pbtrewatha/giant_foxtail.htm
https://oak.ppws.vt.edu/~flessner/weedguide/ambtr.htm
http://weeds.cropsci.illinois.edu/images/Giant%20ragweed/index.htm
http://oak.ppws.vt.edu/~flessner/weedguide/apcca.htm
http://weeds.cropsci.illinois.edu/images/Hemp%20dogbane/index.htm
http://oak.ppws.vt.edu/~flessner/weedguide/lamam.htm
http://www.ipm.ucdavis.edu/PMG/WEEDS/henbit.html
http://oak.ppws.vt.edu/~flessner/weedguide/solca.htm
http://weeds.cropsci.illinois.edu/images/Horsenettle/index.htm
http://oak.ppws.vt.edu/~flessner/weedguide/erica.htm
http://weeds.cropsci.illinois.edu/images/Horseweed/index.htm
burcucumber
Canada thistle
common chickweed
common cocklebur
common milkweed
common ragweed
common waterhemp
curly dock
dandelion
eastern black nightshade
fall panicum
field bindweed
field pennycress
giant foxtail
giant ragweed
hemp dogbane
henbit
horsenettle
horseweed (marestail)
CROP AND PEST IDENTIFICATION FOR AGRONOMY 105
FALL 2015
FIELD CROP WEEDS, continued
Identify the following weeds at seedling, vegetative, and reproductive growth stages. Seed identification is
not required.
Weed
Some Specific Resources
jimsonweed
http://oak.ppws.vt.edu/~flessner/weedguide/datst.htm
http://weeds.cropsci.illinois.edu/images/Jimsonweed/index.htm
http://oak.ppws.vt.edu/~flessner/weedguide/sorha.htm
http://courses.missouristate.edu/pbtrewatha/johnsongrass.htm
http://oak.ppws.vt.edu/~flessner/weedguide/kchsc.htm
http://www.fcps.edu/islandcreekes/ecology/lambs_quarters.htm
http://www.ipm.ucdavis.edu/PMG/WEEDS/lambsquarters.html
http://oak.ppws.vt.edu/~flessner/weedguide/cheal.htm
http://oak.ppws.vt.edu/~flessner/weedguide/digsa.htm
http://courses.missouristate.edu/pbtrewatha/large_crabgrass.htm
http://www.ipm.ucdavis.edu/PMG/WEEDS/morningglories.html
http://weeds.cropsci.illinois.edu/images/Ivyleaf%20morningglory/index.htm
http://oak.ppws.vt.edu/~flessner/weedguide/amapa.htm
http://www.extension.iastate.edu/publications/pm1786.pdf
http://oak.ppws.vt.edu/~flessner/weedguide/polpy.htm
http://weedid.missouri.edu//weedinfo.cfm?weed_id=225
http://oak.ppws.vt.edu/~flessner/weedguide/coima.htm
http://weeds.cropsci.illinois.edu/images/Poison%20hemlock/index.htm
http://oak.ppws.vt.edu/~flessner/weedguide/phtam.htm
http://weeds.cropsci.illinois.edu/images/Pokeweed/index.htm
http://oak.ppws.vt.edu/~flessner/weedguide/lampu.htm
http://weedid.missouri.edu//weedinfo.cfm?weed_id=153
http://oak.ppws.vt.edu/~flessner/weedguide/agrre.htm
http://weedid.missouri.edu//weedinfo.cfm?weed_id=5
http://oak.ppws.vt.edu/~flessner/weedguide/amare.htm
http://www.extension.iastate.edu/publications/pm1786.pdf
http://ohioline.osu.edu/b866/b866_13.html
http://weedid.missouri.edu//weedinfo.cfm?weed_id=315
http://www.ipm.ucdavis.edu/PMG/WEEDS/velvetleaf.html
https://oak.ppws.vt.edu/~flessner/weedguide/abuth.htm
http://oak.ppws.vt.edu/~flessner/weedguide/dauca.htm
http://weeds.cropsci.illinois.edu/images/Wild%20carrot/index.htm
https://oak.ppws.vt.edu/~flessner/weedguide/allvi.htm
http://weedid.missouri.edu//weedinfo.cfm?weed_id=10
http://oak.ppws.vt.edu/~flessner/weedguide/sinar.htm
http://extension.missouri.edu/p/ipm1007-39
http://weedid.missouri.edu//weedinfo.cfm?weed_id=426
http://oak.ppws.vt.edu/~flessner/weedguide/cypes.htm
http://courses.missouristate.edu/pbtrewatha/yellow_nutsedge.htm
Johnsongrass
kochia
lambsquarters
large crabgrass
morningglories
Palmer amaranth
Pennsylvania smartweed
poison hemlock
pokeweed
purple deadnettle
quackgrass
redroot pigweed
shattercane
velvetleaf
wild carrot
wild garlic
wild mustard
woolly cupgrass
yellow nutsedge
CROP AND PEST IDENTIFICATION FOR AGRONOMY 105
FALL 2015
20 FIELD CROP DISEASES
Identify the symptoms of the following diseases and identify the crops they infect.
General Resources:
https://ag.purdue.edu/btny/Extension/Pages/CropPathology.aspx
http://extension.cropsci.illinois.edu/fieldcrops/diseases/
https://www.pioneer.com/home/site/us/agronomy/crop-management/corn-insect-disease-main/
Disease
Crop
Some Specific Resources
anthracnose stalk
rot
corn
Asian rust
brown stem rot
common rust
soybeans
soybeans
corn
common smut
corn
crazy top
corn
diplodia stalk and
ear rot
corn
frogeye leaf spot
fusarium stalk
and ear rot
soybeans
corn
gibberella stalk
and ear rot
Goss’s leaf blight
corn
http://ohioline.osu.edu/ac-fact/0022.html
https://www.pioneer.com/home/site/us/agronomy/crop-management/corninsect-disease/anthracnose-stalk-rot/
http://www.ppdl.purdue.edu/PPDL/pubs/soybean_rust_symptoms_web.pdf
http://www.extension.purdue.edu/extmedia/BP/BP-41-W.pdf
https://www.pioneer.com/home/site/ca/agronomy/crop-management/corninsect-disease/common-rust-of-corn/
http://ohioline.osu.edu/hyg-fact/3000/3119.html
https://pdc.unl.edu/agriculturecrops/corn/commonsmut
http://ohioline.osu.edu/ac-fact/0034.html
http://www.apsnet.org/publications/imageresources/Pages/Iw000015.aspx
http://ohioline.osu.edu/ac-fact/0046.html
https://www.pioneer.com/home/site/ca/agronomy/crop-management/corninsect-disease/diplodia-ear-rot/
www.extension.purdue.edu/extmedia/BP/BP-131-W.pdf
https://www.pioneer.com/home/site/us/agronomy/crop-management/corninsect-disease/fusarium-stalk-rot/
https://www.pioneer.com/home/site/ca/agronomy/crop-management/corninsect-disease/fusarium-ear-rot/
http://ohioline.osu.edu/ac-fact/0033.html
http://www.extension.purdue.edu/extmedia/BP/BP-77-W.pdf
gray leaf spot
corn
head blight (scab)
northern corn
leaf blight
phytophthora
root rot
wheat
corn
powdery mildew
soybeans
seedling blights
corn and
soybeans
soybeans
soybean cyst
nematode
sudden death
syndrome
white mold
corn
soybeans
http://pdc.unl.edu/agriculturecrops/corn/gosswilt
https://www.pioneer.com/home/site/ca/agronomy/crop-management/corninsect-disease/goss-wilt/
http://ohioline.osu.edu/ac-fact/0038.html
https://www.pioneer.com/home/site/us/agronomy/crop-management/corninsect-disease/gray-leaf-spot/
http://www.extension.purdue.edu/extmedia/BP/BP-33-W.pdf
http://www.extension.purdue.edu/extmedia/BP/BP-84-W.pdf
http://www.extension.iastate.edu/publications/pm914.pdf
https://www.pioneer.com/home/site/us/agronomy/crop-management/soybeaninsect-disease/prr/
http://fyi.uwex.edu/fieldcroppathology/files/2010/12/powdery_mildew_06.pdf
http://www.extension.umn.edu/agriculture/cropdiseases/soybean/powderymildew.html
http://bulletin.ipm.illinois.edu/print.php?id=556
http://extension.missouri.edu/p/G4450
http://extension.entm.purdue.edu/nematology/soybeannems.html
soybeans
https://www.extension.purdue.edu/extmedia/bp/bp-58-w.pdf
soybeans
http://www.extension.purdue.edu/extmedia/BP/BP-43-W.pdf
CROP AND PEST IDENTIFICATION FOR AGRONOMY 105
FALL 2015
20 FIELD CROP INSECTS
Identify the following at the stage listed (L=larvae, A=adult) and identify the crops they infest.
General Resources:
http://extension.entm.purdue.edu/publications/pubs/f_crop.html
http://extension.cropsci.illinois.edu/fieldcrops/insects/
http://extension.entm.purdue.edu/fieldcropsipm/corn.php
http://extension.entm.purdue.edu/fieldcropsipm/soybean.php
https://www.pioneer.com/home/site/ca/agronomy/crop-management/corn-insect-disease-guide/
Insect
Crop
Some Specific Resources
alfalfa weevil L
alfalfa
armyworm L
bean leaf beetle
A
brown stink bug
A
corn leaf aphid
A
corn rootworms
L,A
cutworms L
corn earworm L
corn
soybeans
http://extension.cropsci.illinois.edu/fieldcrops/insects/alfalfa_weevil/
http://extension.entm.purdue.edu/fieldcropsipm/insects/alfalfa-weevil.php
http://extension.entm.purdue.edu/fieldcropsipm/insects/corn-armyworm.php
http://www.ent.iastate.edu/soybeaninsects/bean_leaf_beetle
http://extension.entm.purdue.edu/fieldcropsipm/insects/bean-leaf-beetle.php
European corn
borer L,A
flea beetle A
corn
Hessian fly L,A
Japanese beetle
L,A
potato
leafhopper A
seedcorn
maggot L
soybean aphid A
spider mites A
stalk borer L
wheat
soybeans
Western bean
cutworm L
white grubs L
corn
corn
http://extension.entm.purdue.edu/fieldcropsipm/insects/corn-whitegrubs.php
wireworm L
corn
http://extension.entm.purdue.edu/fieldcropsipm/insects/corn-wireworms.php
corn
http://extension.entm.purdue.edu/fieldcropsipm/insects/brown-stinkbug.php
corn
http://www2.ca.uky.edu/entomology/entfacts/ef126.asp
http://extension.entm.purdue.edu/fieldcropsipm/insects/corn-leaf-aphid.php
corn
http://extension.entm.purdue.edu/fieldcropsipm/insects/corn-rootworms.php
corn
corn
http://extension.entm.purdue.edu/fieldcropsipm/insects/corn-cutworms.php
http://extension.entm.purdue.edu/fieldcropsipm/insects/corn-occasionals.php
(scroll to earworm information)
http://extension.entm.purdue.edu/fieldcropsipm/insects/euro-cornborer.php
corn
http://www.extension.iastate.edu/CropNews/2011/0521hodgson.htm
http://extension.entm.purdue.edu/fieldcropsipm/insects/corn-flea-beetle.php
http://extension.entm.purdue.edu/fieldcropsipm/insects/hessianfly.php
http://extension.entm.purdue.edu/fieldcropsipm/insects/corn-japanesebeetles.php
alfalfa
http://extension.entm.purdue.edu/fieldcropsipm/insects/sg-potatoleafhopper.php
corn
http://extension.entm.purdue.edu/fieldcropsipm/insects/corn-seedcornmaggot.php
soybeans
soybeans
corn
http://extension.entm.purdue.edu/fieldcropsipm/insects/soybean-aphid.php
http://extension.entm.purdue.edu/fieldcropsipm/insects/soybean-spidermite.php
http://ipm.illinois.edu/fieldcrops/insects/stalk_borer/
http://extension.entm.purdue.edu/fieldcropsipm/insects/stalk-borer.php
http://extension.entm.purdue.edu/fieldcropsipm/insects/western-beancutworm.php
CROP AND PEST IDENTIFICATION FOR AGRONOMY 105
FALL 2015