Agricultural Plant Pest Control Category
1A- Missouri Exam Questions and
Answers
Weeds
Problematic Weeds in no-till production systems - Correct Answers -● Field bindweed
● Johnsongrass
● Hemp dogbane
● Common milkweed
● Yellow nutsedge
Weeds
Forage-type sorghums
(most troublesome to grain sorghum) - Correct Answers -● Shattercane
● Johnsongrass
Weeds
Soy bean problem weeds in northern Missouri - Correct Answers -● Cocklebur
● Common waterhemp
Weeds
Problem weeds in southeastern Missouri - Correct Answers -● 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. - Correct Answers -4 to 6 weeks
Soybean foliage disease
Downy mildew - Correct Answers -● Pale green to light yellow spots or blotches on the
upper surface of young leaves.
● Eventually the lesions turn grayish brown to dark brown with a yellowish-green
margin.
● During periods of heavy dew or wet weather, a gray to purple fuzz of mold develops
on the lower leaf surface in the diseased areas.
Soybean foliage disease
, Powdery mildew - Correct Answers -● Begin as small areas of white mold growth on the
upper leaf surface.
● These lesions may expand to cover larger areas of the leaf surface.
●They may also form on the lower leaf surfaces, stems, petioles, and pods.
Management of soybean foliage diseases should include the following: - Correct
Answers -● Planting good quality seeds of resistant varieties
● Planting disease-free seed
● Maintaining good plant vigor
● Applying foliar fungicides if warranted
Weeds
Soybeans planted in narrow rows, 20 inches apart, require ____ days for the foliar
canopy to develop and provide full soil shading - Correct Answers -45 days
Weeds
Soybeans planted in rows spaced 30 inches apart require ____ days for full soil
shading. - Correct Answers -60 days
Weeds
A typical weed management strategy for no-till corn and grain sorghum production is to
apply a mixture of a _____________ - Correct Answers -Burndown (herbicide to control
existing vegetation)
Weeds
There must be at least ____________ inches of actively growing weed shoot to obtain
goo d herbicide contact. - Correct Answers -8 to 12 inches
Corn Insects
The most severe corn pests include - Correct Answers -● Northern rootworms
● Western rootworms
● European corn borer
● Black cutworm
● Southwestern corn borer
● Fall armyworm
● Corn earworm
Corn Insects
European corn borer - Correct Answers -● 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
1A- Missouri Exam Questions and
Answers
Weeds
Problematic Weeds in no-till production systems - Correct Answers -● Field bindweed
● Johnsongrass
● Hemp dogbane
● Common milkweed
● Yellow nutsedge
Weeds
Forage-type sorghums
(most troublesome to grain sorghum) - Correct Answers -● Shattercane
● Johnsongrass
Weeds
Soy bean problem weeds in northern Missouri - Correct Answers -● Cocklebur
● Common waterhemp
Weeds
Problem weeds in southeastern Missouri - Correct Answers -● 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. - Correct Answers -4 to 6 weeks
Soybean foliage disease
Downy mildew - Correct Answers -● Pale green to light yellow spots or blotches on the
upper surface of young leaves.
● Eventually the lesions turn grayish brown to dark brown with a yellowish-green
margin.
● During periods of heavy dew or wet weather, a gray to purple fuzz of mold develops
on the lower leaf surface in the diseased areas.
Soybean foliage disease
, Powdery mildew - Correct Answers -● Begin as small areas of white mold growth on the
upper leaf surface.
● These lesions may expand to cover larger areas of the leaf surface.
●They may also form on the lower leaf surfaces, stems, petioles, and pods.
Management of soybean foliage diseases should include the following: - Correct
Answers -● Planting good quality seeds of resistant varieties
● Planting disease-free seed
● Maintaining good plant vigor
● Applying foliar fungicides if warranted
Weeds
Soybeans planted in narrow rows, 20 inches apart, require ____ days for the foliar
canopy to develop and provide full soil shading - Correct Answers -45 days
Weeds
Soybeans planted in rows spaced 30 inches apart require ____ days for full soil
shading. - Correct Answers -60 days
Weeds
A typical weed management strategy for no-till corn and grain sorghum production is to
apply a mixture of a _____________ - Correct Answers -Burndown (herbicide to control
existing vegetation)
Weeds
There must be at least ____________ inches of actively growing weed shoot to obtain
goo d herbicide contact. - Correct Answers -8 to 12 inches
Corn Insects
The most severe corn pests include - Correct Answers -● Northern rootworms
● Western rootworms
● European corn borer
● Black cutworm
● Southwestern corn borer
● Fall armyworm
● Corn earworm
Corn Insects
European corn borer - Correct Answers -● 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
