-2- 



For corn or soybeans, apply 1/8 lb. of dieldrin or 1 l/2 lb. of toxaphene 

 per acre. Do not apply toxaphene to corn or soybeans to be used for hay, ensilage 

 or stover for dairy cattle or animals being finished for slaughter. Dieldrin, l/8 lb. 

 per acre, can be applied to corn to within kO days of harvest or ensiling and to 

 soybeans to within 60 days of harvest or feeding. One ounce of dieldrin per acre may 

 be applied to soybeans to within 35 days of harvest or feeding. 



All of these insecticides can be used on lawns for grasshopper control. 

 One ounce of actual dieldrin (5 fluid ounces of 15$ concentrate) per 10,000 square 

 feet will control them and provide residual control. For gardens, Diazinon, dibrom, 

 malathion or Sevin can be used. Read the label for interval between application and 

 harvest of vegetables. 



Armyworms : A few worms have been reported in northern Illinois in luxuriant 

 stands of oats and grasses. Some infestations may appear in corn where grass is 

 abundant. One-fourth pound of dieldrin may be used to control armyworms in corn. 

 Do not treat within 60 days of harvest or cutting for ensilage. Toxaphene, 1 1/2 lb. per 

 acre, may be used on corn that is not to be used for ensilage or stover. 



Use l/k lb. of dieldrin on oats, but allow one week between application 

 and harvest. Do not feed or graze the straw for 30 days after treatment. Toxaphene 

 may also be used on oats with one week between application and harvest. Do not feed 

 the straw to dairy animals or livestock fattening for slaughter. 



If hay crops need treatment before cutting, apply 1 l/2 lb. of Sevin or 

 1 lb. of malathion per acre. Wo interval between application and harvest is required 

 with Sevin; one week is needed for malathion. Methoxychlor will not kill the worms 

 but will stop them from feeding; use 1 1/2 to 2 lb. per acre, and allow one week 

 between application and harvest or pasture. 



Corn borer pupation this week has reached 50$, with only slight emergence of 

 moths. Pupation of first- generation borers may reach almost 100$ this year compared 

 with 50 to 75$ in an average year. Thus we can expect some increase in second- 

 generation corn borer this year compared with the past five years. Egg laying will prob- 

 ably start in central Illinois this week. Sweet corn growers, particularly canners, 

 should watch fields that are 15 days or more from harvest. 



Crickets: Large numbers are developing in fields this year. If they begin 

 to migrate, last year's invasion of crickets may be repeated. If migration occurs, 

 apply 2$ chlordane or l/2$ dieldrin around the foundation of the house and around 

 doorways. Follow label precautions in handling insecticide concentrates. 



A bristly brown and orange caterpillar with no common name may be present 

 in moderate numbers in late-maturing corn. This insect is a general feeder, eating 

 the leaves and giving the plant a ragged appearance. Control is usually not neces- 

 sary, since wasp parasites ordinarily control this insect. 



Caution : Before applying insecticides, read the labels, carefully and 

 follow all precautions. This not only will insure personal safety, but will also 

 eliminate insecticide residue hazards. 



********** 



This weekly report was prepared by H. B. Petty, Illinois Agricultural Ex- 

 tension Service and Illinois Natural History Survey, in cooperation with USDA Agri- 

 cultural Research Service, Plant Pest Control Branch, from information gathered by 

 entomologists and cooperators who send in weekly reports from their own localities. 



7/20/62 



