Illinois Field Crop Applicators Test with Verified Solutions 2024/2025

Illinois Field Crop Applicators Test with Verified Solutions 2024 various, economical, environmentally sound, socially acceptable - Answer -An integrated pest management program is based upon what factors? Economic threshhold - Answer -What is the number of pests that should be controlled to prevent economic damage from occurring? Economic Injury level - Answer -Number of pests, costs of various treatments, expected yield, and expected grain value are all factors to determine.... Do not treat, but scout again later. - Answer -What should be done if scouting detects an important pest, but its numbers do not reach the economic threshold? random - Answer -When scouting, where in the field should you sample? Cultural, Mechanical, Biological, Chemical - Answer -What are the 4 types of control measures used in an IPM? Larvae - Answer -At what stage in the life-cycle of a Corn rootworm does it prune and tunnel through the roots causing stalk lodging? Adult - Answer -At what life-cycle stage does a corn rootworm cause ear damage by feeding on the silks? When silks are green, 5 or more beetles per plant if silks are clipped within 1/2 inch of the ear tip. - Answer -What are the economic thresholds when scouting for corn rootworm beetles in corn? From late July to late august at least 5 beetles per unbaited pherocon AM trap in soybeans or .75 beetles per plant in non-rotated corn. - Answer -What are the economic thresholds when scouting for corn rootworm beetles in soy? feed on the leaves and older larvae cause leaf cutting leading to reduced stands. - Answer -What damage does a black cutworm larvae do to corn seedlings? Crop debris, winter annaul weeds, late planted - Answer -What are 3 factors that have the most potential to lead to black cutworm damage? rescue treatments when nessisary - Answer -What is the recommended method for managing black cutworms in IL? European corn borer - Answer -What type of larvae causes whorl damage in 1st generation, stalk tunneling damage in the 2nd generation with possible ear tunneling and stalk rot?Leaf Aphid - Answer -Damages corn by coating the tassels and silks with honeydew which reduces pollination. Japanese beetle grubs and other white grubs. - Answer -What insects have white, C-shaped, and about 1 inch long larvea which can be differentiated by their raster patterns? Japanese beetle grubs - Answer -They chew on the roots and root hairs of seedlings resulting in irregular emergence, reduced stands, and stunted or wilted plants. Injured plants may turn purple because they cannot take up phosphorus. Japanese beetle adults. - Answer -They are metallic looking green beetles that are 3/8 to 1/2 and inch long with coppery wing covers. feed on the silks - Answer -What kind of damage do Japanese beetle adults cause? adult bean leaf beetle. - Answer -1/4 inch beetle, black triangle on neck just below the head? 16 or more - Answer -When bean leaf beetles feed on cotyledons and first true leaves what is the amount of beetles per foot of row that is the economic threshold? 30-40% - Answer -When bean leaf beetles eat holes in leaves during the vegetative growth stage what is the percent defoliation that is the economic threshold? 20% defoliation or 5-10% injured pods - Answer -when bean leaf beetles feed during pod fill what is the percentage of defoliation or damaged pods that is the economic threshold? soybean aphids - Answer -pinhead sized, yellow, round, soft bodied, insects on the undersides of soybean leaves soybean aphids - Answer -What pest causes the following damage: suck sap from sobean plants causing the leaves to curl and turn yellow, excrete honeydew, sooty mold grows on the honeydew lowering photosynthesis, heavy infestations cause lowers pod counts, and they act as a vector for pathogens. spider mites - Answer -What pest causes the following damage: Stripping leaves, fine silk on leaves and between plants, bronzing leaves, curled leaves and leaf drop. Larvae - Answer -What alfalfa weevil lifecycle stage is described here: up to 1/2 inch long with dark heel. Green with stripe down back. adult - Answer -What alfalfa weevil lifecycle stage is described here: 1/2 inch long beetle that is meduim brown w/ dark brown stripe. hard shell. alfalfa weevil - Answer -What pest causes this damage: larvae skeltonize leaves, causes fields to appear frosted, adults feather the leaves and chew stems alfalfa weevil - Answer -What pest has this economic threshold? first crop- 3 or more larvae per stem and 20% of the tips cuttings- feeding on 50% of crowns and no regrowth for 3-6 days. potato leafhopper - Answer -Name this pest: 1/8 inch long, green, wedge shaped potato leafhopper - Answer -what pest causes this damage: yellowish leaflets and dark brown triangular leaflet tips. after the first crop - Answer -when is alfalfa most susceptible to potato leafhopper damage and as a consequence when is the most critical time to scout for this pest? armyworm larvae - Answer -name the pest- Appearance is grean brown w/ orange stripes up to 1.