-J- 



when approached and leave white scratch marks on the leaves. For control, apply 

 3/4 pound of carbaryl (Sevin) , or 1 1/2 pounds of toxaphone per acre as a band over 

 the row. Carbaryl would be the preferred material for use on dairy farms. 



Corn soil insects can be controlled best by broadcasting 1 1/2 pounds of aldrin or 

 heptachlor per acre, then disking in immediately. Do not use on dairy farms and 

 do not expect control of resistant northern or western corn rootworms with these 

 materials. For fields with an average infestation of soil insects and without a 

 history of cutworm problems, row treatments with aldrin or heptachlor at 1 pound 

 per acre have been highly satisfactory. No insecticide treatment of seeds is needed 

 when aldrin or heptachlor is used as a soil treatment. 



Dairy farmers or farmers having a known or suspected field of resistant rootworms 

 should use phorate (Thimet) , diazinon, 0-5353 (Buxten) , disulfoton (Di-Syston), or 

 parathion as granules in a band. In addition, when a phosphate insecticide is 

 banded, the seed corn itself should be treated with dieldrin or heptachlor to pro- 

 tect against seed- infesting insects. 



Seed corn maggot adults were observed this week at Champaign. Populations appeared 

 to be higher than last year. This insect is laying its eggs in the soil (particu- 

 larly soils with higher levels of organic matter) and the maggots will attack the 

 germinating corn seeds. Row and broadcast applications of aldrin or heptachlor ef- 

 fectively control this insect. Also seed treatments with dieldrin, heptachlor, 

 aldrin, or lindane are effective. 



Homeowner Insect Problems 



Forest tent caterpillars have defoliated trees in a few localities in southern Illi- 

 nois this past week. The worm is hairy and pale-blue, with a row of keyhole- 

 shaped white spots down the middle of the back and pale-yellow stripes along the 

 sides. They prefer poplar, but are also destructive to oaks and maple. For con- 

 trol, spray the foliage with carbaryl (Sevin) or lead arsenate when the feeding and 

 worms are first noticed. Use 2 pounds of carbaryl, 50-percent wettable powder in 

 100 gallons of water, or 4 pounds of lead arsenate wettable powder in 100 gallons 

 of water. 



If grubs were a problem in your lawn last summer or you wish to prevent a problem, 

 apply chlordane at 1 1/4 pounds of actual chemical per 10,000 square feet. In es- 

 tablished sod, apply as granules or spray on a small area, then water- in thoroughly 

 before spraying another small area. For new seedings, mix in soil before planting. 

 Do not plant vegetable root crops in treated soil for five years. This treatment 

 should also eliminate ants and soil-nesting wasps from the yard. 



Ticks are already annoying campers, hikers, picnickers, fishermen, and others. Use 

 a repellent on socks, pant cuffs, and exposed parts of the body when entering tick- 

 infested areas (wooded and grassy areas) . A material called DEET (diethyl toluamide) 

 is one of the best tick repellents. 



For control of ticks in home yards, spray grass, weeds, flowers, and low shrubbery 

 with diazinon, malathion, or carbaryl (Sevin) . Do not apply diazinon to ferns or 

 hibiscus, malathion to cannaert red cedar, or carbaryl to Boston ivy. 



