What kind of damage does black cutworm larvae do to corn seedlings?
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young - chew holes in leaves
older - cut plants
Describe the following herbicide application timing: Preplant incorporated (PPI)
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applied and mechanically incorporated prior to planting
What do Japanese beetle adults look like?
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Metallic green beetles that are 3/8 to 1/2 inch long with
coppery wing covers
What affects spray droplet size?
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Surface Tension
Guidelines suggest applying foliar fungicides under the following conditions for
intermediate hybrids
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- disease symptoms are present on the third leaf below the ear or higher on
50% of the plants examined
- field is within an area with a history of foliar disease problems
- previous crop was corn
- there is a surface residue of 35% or more
- weather is warm and humid
Should you use a higher or lower POST herbicide rate based on the following
conditions: high weed density
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, higher label rate
What units is density measured in?
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pounds per gallon
Droplets smaller than __________ microns are at high risk of drifting
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150
PWM is not compatible with
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air induction nozzles
What is the recommended methods for managing black cutworms in Illinois?
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, apply a rescue treatment when 3% or more plants are cut
preventative treatments not effective
What kind of damage does alfalfa weevil cause?
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- larvae skeletonize leaves, causing fields to appear "frosted"
- adults "feather" the leaves and chew on stems
Economic Thresholds:
-at first cutting: >3 larvae per stem and 20% of the tips skeletonized
-later cuttings: feeding on 50% of crowns and no regrowth for 3-6 days
Cotyledons
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food source for the seedling
most weed seeds germinate in the top ______ of soil
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2"
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young - chew holes in leaves
older - cut plants
Describe the following herbicide application timing: Preplant incorporated (PPI)
Give this one a try later!
applied and mechanically incorporated prior to planting
What do Japanese beetle adults look like?
,Give this one a try later!
Metallic green beetles that are 3/8 to 1/2 inch long with
coppery wing covers
What affects spray droplet size?
Give this one a try later!
Surface Tension
Guidelines suggest applying foliar fungicides under the following conditions for
intermediate hybrids
Give this one a try later!
- disease symptoms are present on the third leaf below the ear or higher on
50% of the plants examined
- field is within an area with a history of foliar disease problems
- previous crop was corn
- there is a surface residue of 35% or more
- weather is warm and humid
Should you use a higher or lower POST herbicide rate based on the following
conditions: high weed density
Give this one a try later!
, higher label rate
What units is density measured in?
Give this one a try later!
pounds per gallon
Droplets smaller than __________ microns are at high risk of drifting
Give this one a try later!
150
PWM is not compatible with
Give this one a try later!
air induction nozzles
What is the recommended methods for managing black cutworms in Illinois?
Give this one a try later!
, apply a rescue treatment when 3% or more plants are cut
preventative treatments not effective
What kind of damage does alfalfa weevil cause?
Give this one a try later!
- larvae skeletonize leaves, causing fields to appear "frosted"
- adults "feather" the leaves and chew on stems
Economic Thresholds:
-at first cutting: >3 larvae per stem and 20% of the tips skeletonized
-later cuttings: feeding on 50% of crowns and no regrowth for 3-6 days
Cotyledons
Give this one a try later!
food source for the seedling
most weed seeds germinate in the top ______ of soil
Give this one a try later!
2"
