-2- 



type of growth that armyworm moths lay eggs. Examine all lodged spots carefully. 

 If an infestation develops, control will probably not be needed for two weeks or 

 more. 



Toxaphene, 1 1/2 pounds, or dieldrin, l/k pound per acre, is recommended 

 for small grains. Allow 7 days between treatment with dieldrin and harvest of 

 grains and 7 days for toxaphene , except for barley, which requires a 1^-day waiting 

 period. For beef pastures, use toxaphene; allow a ^2-day period between last 

 grazing on treated pastures and slaughter. For dairy pastures, use 2 pounds of 

 methoxychlor per acre, but do not graze for one week after treatment. 



Greenbug : Be on the watch for small yellow or dead spots in small grain 

 fields in which the dying grain is covered with aphids, as greenbugs may appear 

 this year. 



Spring cankerworm ; These measuring or inch worms begin to feed on elm 

 leaves just before or as they are emerging from the bud in the early spring. Con- 

 trol when the worms are small will be beneficial. Apply a spray of k pounds of 

 lead arsenate, 2 pounds of 50 percent wettable DDT, or 1 quart of 25 percent emul- 

 sifiable DDT per 100 gallons of water as the leaf buds are opening or shortly there- 

 after. 



Caution : Before applying insecticides, read labels carefully and follow 

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

 nate insecticide residue hazards. 



Special Note to Farm Advisers : It is difficult to distinguish the English 

 grain aphid from the greenbug. A hand lens is needed to observe this difference. 

 Cornicles are tubes or protuberances on the back of an aphid. The cornicles and 

 legs on the English grain aphid are slender and long; and on a greenbug, short and 

 stubby. 



If you are not already doing so , please send us your estimate of the 

 percent of the corn crop that was planted on May 2, 9, 16, 23, and 30. This in- 

 formation will help us anticipate abundance of various corn insect pests. 



■*##■*■*•*#### 



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

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

 Agricultural Service, Plant Pest Control Branch, from information gathered by ento- 

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



HBP:bb 

 5/12/61 



