AGRICULTURAL PLANT PEST
CONTROL CATEGORY 1A- MISSOURI
Weeds
Problematic-Weeds-in-no-till-production-systems---ans-✔✔●-Field-bindweed
●-Johnsongrass
●-Hemp-dogbane
●-Common-milkweed
●-Yellow-nutsedge
Weeds
Forage-type-sorghums-
(most-troublesome-to-grain-sorghum)---ans-✔✔●-Shattercane
●-Johnsongrass
Weeds
Soy-bean-problem-weeds-in-northern-Missouri---ans-✔✔●-Cocklebur
●-Common-waterhemp
Weeds
Problem-weeds-in-southeastern-Missouri---ans-✔✔●-Sicklepod
Weeds
The-critical-weed-free-period-for-these-crops-is-during-the-first-___________-weeks-
following-crop-emergence-because-weed-competition-during-this-period-will-reduce-
yields.---ans-✔✔4-to-6-weeks
Weeds
Soybeans-planted-in-narrow-rows,-20-inches-apart,-require-____-days-for-the-foliar-
canopy-to-develop-and-provide-full-soil-shading---ans-✔✔45-days
Weeds
Soybeans-planted-in-rows-spaced-30-inches-apart-require-____-days-for-full-soil-
shading.---ans-✔✔60-days
Weeds
A-typical-weed-management-strategy-for-no-till-corn-and-grain-sorghum-production-is-to-
apply-a-mixture-of-a-_____________---ans-✔✔Burndown-(herbicide-to-control-existing-
vegetation)
, Weeds
There-must-be-at-least-____________-inches-of-actively-growing-weed-shoot-to-obtain-
goo-d-herbicide-contact.---ans-✔✔8-to-12-inches
Corn-Insects
The-most-severe-corn-pests-include---ans-✔✔●-Northern-rootworms
●-Western-rootworms
●-European-corn-borer
●-Black-cutworm
●-Southwestern-corn-borer
●-Fall-armyworm
●-Corn-earworm
Corn-Insects
European-corn-borer---ans-✔✔●-Overwinters-in-Missouri-in-the-pupal-stage-and-can-
become-a-severe-pest-of-corn-in-later-years.
●-Adults-emerge-in-the-spring,-mate-and-lay-eggs-in-masses-of-about-30-eggs-each.-
●-Eggs-are-generally-laid-on-the-underside-of-leaves-and-have-an-appearance-similar-to-a-
small-mass-of-white-fish-scales.
Corn-Insects
Most-corn-varieties-contain-a-chemical-called-______________---ans-✔✔●-DIMBOA
Corn-Insects
What-does-DIMBOA-do?---ans-✔✔●-Provides-some-resistance-from-first-generation-
European-corn-borer-when-plants-are-less-than-20-inches-tall.
Corn-Insects
Occasional-corn-insect-pests:---ans-✔✔●-Wireworms-
●-White-grubs-
●-Grasshoppers-
●-Grape-colaspis-
●-Dingy-cutworm-
●-True-armyworm-
●-Flea-beetles-
●-Maize-billbug-
●-Chinch-bugs
Corn-Insects
Fall-armyworm---ans-✔✔●-Feed-deep-inside-the-whorl-on-developing-leaves-causing-
ragged-edge-holes-and-leaving-moist,-brown-frass.
●-Larvae-are-variable-in-color,-ranging-from-nearly-black-to-green-to-light-tan.-They-have-
three-narrow-yellowish-white-lines-running-down-the-back-from-the-head-to-the-tail.-
Darker-stripes-extend-down-the-side-of-the-body.-Black-tubercles-(bumps)-with-spines-are-
scattered-along-the-body.
CONTROL CATEGORY 1A- MISSOURI
Weeds
Problematic-Weeds-in-no-till-production-systems---ans-✔✔●-Field-bindweed
●-Johnsongrass
●-Hemp-dogbane
●-Common-milkweed
●-Yellow-nutsedge
Weeds
Forage-type-sorghums-
(most-troublesome-to-grain-sorghum)---ans-✔✔●-Shattercane
●-Johnsongrass
Weeds
Soy-bean-problem-weeds-in-northern-Missouri---ans-✔✔●-Cocklebur
●-Common-waterhemp
Weeds
Problem-weeds-in-southeastern-Missouri---ans-✔✔●-Sicklepod
Weeds
The-critical-weed-free-period-for-these-crops-is-during-the-first-___________-weeks-
following-crop-emergence-because-weed-competition-during-this-period-will-reduce-
yields.---ans-✔✔4-to-6-weeks
Weeds
Soybeans-planted-in-narrow-rows,-20-inches-apart,-require-____-days-for-the-foliar-
canopy-to-develop-and-provide-full-soil-shading---ans-✔✔45-days
Weeds
Soybeans-planted-in-rows-spaced-30-inches-apart-require-____-days-for-full-soil-
shading.---ans-✔✔60-days
Weeds
A-typical-weed-management-strategy-for-no-till-corn-and-grain-sorghum-production-is-to-
apply-a-mixture-of-a-_____________---ans-✔✔Burndown-(herbicide-to-control-existing-
vegetation)
, Weeds
There-must-be-at-least-____________-inches-of-actively-growing-weed-shoot-to-obtain-
goo-d-herbicide-contact.---ans-✔✔8-to-12-inches
Corn-Insects
The-most-severe-corn-pests-include---ans-✔✔●-Northern-rootworms
●-Western-rootworms
●-European-corn-borer
●-Black-cutworm
●-Southwestern-corn-borer
●-Fall-armyworm
●-Corn-earworm
Corn-Insects
European-corn-borer---ans-✔✔●-Overwinters-in-Missouri-in-the-pupal-stage-and-can-
become-a-severe-pest-of-corn-in-later-years.
●-Adults-emerge-in-the-spring,-mate-and-lay-eggs-in-masses-of-about-30-eggs-each.-
●-Eggs-are-generally-laid-on-the-underside-of-leaves-and-have-an-appearance-similar-to-a-
small-mass-of-white-fish-scales.
Corn-Insects
Most-corn-varieties-contain-a-chemical-called-______________---ans-✔✔●-DIMBOA
Corn-Insects
What-does-DIMBOA-do?---ans-✔✔●-Provides-some-resistance-from-first-generation-
European-corn-borer-when-plants-are-less-than-20-inches-tall.
Corn-Insects
Occasional-corn-insect-pests:---ans-✔✔●-Wireworms-
●-White-grubs-
●-Grasshoppers-
●-Grape-colaspis-
●-Dingy-cutworm-
●-True-armyworm-
●-Flea-beetles-
●-Maize-billbug-
●-Chinch-bugs
Corn-Insects
Fall-armyworm---ans-✔✔●-Feed-deep-inside-the-whorl-on-developing-leaves-causing-
ragged-edge-holes-and-leaving-moist,-brown-frass.
●-Larvae-are-variable-in-color,-ranging-from-nearly-black-to-green-to-light-tan.-They-have-
three-narrow-yellowish-white-lines-running-down-the-back-from-the-head-to-the-tail.-
Darker-stripes-extend-down-the-side-of-the-body.-Black-tubercles-(bumps)-with-spines-are-
scattered-along-the-body.
