-2- 



If migration from small grain to corn appears likely, apply 1/2 pound of 

 dieldrin per acre as a barrier treatment. Apply it in a strip two rods vide into the 

 grain and the same distance into the corn just as migration begins . If the grain is 

 being damaged and the entire field is to be sprayed, use only 1/k pound of actual 

 dieldrin per acre. Do not apply dieldrin within one week of harvest, and do not feed 

 the straw to dairy cattle or livestock being fattened for slaughter. 



Dairy farmers should not use dieldrin but might try one pound of carbaryl 

 per acre on the corn. Direct the spray to the base of the plants. Repeated treat- 

 ments may be needed during migration, as carbaryl is not so effective as dieldrin. 



Thrips , which are tiny yellow or black insects (about l/l6 inch) with rasp- 

 ing, sucking mouth parts, are common in the whorl leaves of corn. Their feeding ap- 

 pears as tiny streaks of white on leaves. When thrips are abundant, the leaves take 

 on a silvery appearance. The plants usually outgrow the damage, and rain helps. (Al- 

 though it has not been verified, thrips must be listed as a potential vector for maize 

 dwarf mosaic virus.) If control became necessary, carbaryl at 1 pound of actual chem- 

 ical per acre should be satisfactory. 



Stored-grain insects : With the beginning of wheat harvest , stored-grain 

 insects are preparing for the big feast. Prevent damage from these pests by sweeping 

 up and cleaning out all old grain and other debris from inside and around the bin. 

 Then spray all inside surfaces to runoff with 1.5% premium-grade malathion or 2.5% 

 methoxychlor . Also treat the wheat, as it is being binned, with a liquid or dust form 

 of premium-grade malathion. These three steps will insure insect-free wheat for a 

 year or more. 



Bagworms have hatched and are attacking evergreens and other shrubs . In the 

 central section, the worms are about 1/U inch long and are enclosed in a brown, cone- 

 shaped sack that they carry with them. Larger worms in their protective sacks are 

 difficult to kill and in another two or three weeks spray results may be unsatisfac- 

 tory. Therefore, apply the sprays immediately if worms are present. An insecticide 

 like malathion, carbaryl or diazinon will control bagworms. Follow the directions on 

 the label for treatment. 



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

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

 nate residue hazards. 



********** 



Prepared by H. B. Petty, Steve Moore, Roscoe Randell and Clarence E. White 

 Extension Entomologists, University of Illinois College of Agriculture 

 and Illinois Natural History Survey 



********** 



Steve Moore III 

 Extension Specialist 

 in Entomology 



