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Cooperative Extension Service, University of 

 Illinois College of Agriculture in Cooperation With 

 the Illinois Natural History Survey and U.S.D.A. 



FOR IMMEDIATE RELEASE June 2k, I966 



INSECT SURVEY BULLETIN NO. 10 



This tenth weekly bulletin on the general insect situation in Illinois 

 (fruit insects excepted), prepared by entomologists of the University of Illinois 

 College of Agriculture, Illinois Natural History Survey and cooperating agencies, 

 reports general trends in insect activity and suggests abbreviated control measures, 

 Each individual should check his own fields to determine local conditions. 



Present Farm Insect Problems 



Armyworm populations are decreasing rapidly, and we are recommending 

 insecticide control measures only in special instances, as it is now too late to 

 reap maximum profit by controlling the worms. Armyworm adults are heavy -bodied 

 brown moths that are now emerging. They are attracted to lights in large numbers. 



Black cutworm moths are present and will continue to be for some time. 

 Damage from the worms of this generation is practically over. 



European corn borer is not expected to present a general problem, and 

 only an occasional exceptionally advanced field will be damaged. In many areas, 

 there are no exceptionally advanced fields, as most fields were planted at the 

 same time. Thus moths will scatter small numbers of eggs in many fields instead 

 of concentrating on a few fields, as often happens. 



Moth flight and egg-laying are about complete in the south half or two- 

 thirds of Illinois. Where needed, insecticide applications should be made before 

 July 1. 



In general, moth flight in the north one -third of the state will peak 

 this week, and egg-laying should be declining rapidly or even be completed by 

 July k. We do not now anticipate much need for insecticide applications on com- 

 mercial field corn. Sweet corn and early-planted fields of seed corn should be 

 observed to determine need for treatment . 



Potato leafhoppers are not so abundant this year as previously. No 

 yellowing of second -growth alfalfa was noted this week due to their feeding. 



Start your stored grain insect control program now. Sweep out the bin. 

 Clean up grain debris outside the bin, and destroy it. Then spray the bin with 

 premium-grade malathion or methoxy chlor . As you bin the wheat, treat it with a 

 premium-grade malathion spray or dust . 



Flies are becoming more numerous on pastured cattle. Horn flies are 

 heavy on some herds, particularly in the southern section. Stable flies are 

 numerous, and populations will continue to increase until September. Occasional 

 horse and deer flies are also attacking cattle. 



