FOR IMMEDIATE RELEASE July 27, 1962 



INSECT SURVEY BULLETIN NO. 15 



These weekly bulletins, prepared "by entomologists of the University of 

 Illinois College of Agriculture, Illinois Natural History Survey and cooperating 

 agencies, report general trends in insect populations in Illinois (fruit insects 

 excepted). Check your own fields to determine local conditions. 



Corn b or er numbers may increase more in some areas this year than -we anti- 

 cipated in last week's report. We are now surveying to determine the abundance of 

 the first- generation borer and the percentage that are pupating to form the second 

 generation. In some counties both the population and the percentage that are 

 pupating are high enough to indicate a moderately high second generation. It appears 

 now that this area may be northward almost to the state line from a line extending 

 across the state through Bloomington and Peoria. We will complete our survey this 

 coming week, and we hope to present a more accurate picture in next week's report. 



Moths have been emerging for about a week to ten days in central and 

 north-central Illinois. No emergence was recorded this week in northern Illinois. 

 Moths have begun to lay eggs, and some hatch has occurred. 



Observe sweet corn fields that are 10 or more days from harvest, and be 

 prepared to treat at first egg hatch. Late field corn may warrant treatment if there 

 are 100 or more egg masses per 100 plants. Use 1 l/2 lb. of DDT per acre on corn 

 for grain,but do not apply to corn for ensilage or stover for dairy animals or 

 animals that will be finished for slaughter. One application of l/2 lb. of endrin 

 may be used to within k^ days of harvest. Toxaphene granules, 1 l/2 lb. per acre, 

 one application only, can be used, but not on corn for ensilage or stover for dairy 

 cattle or animals being finished for slaughter. 



Grasshoppers are still with us, but the situation is spotted; some fields 

 are heavily infested and others have comparatively low populations. In many areas 

 the 'hoppers have already migrated to bean and corn fields. These migrations occur 

 when the legumes or grasses are cut for hay or dry out. In some areas foliage may 

 be so luxuriant in fence rows and ditch banks that the grasshoppers may remain in 

 them. 



Our recommendations for control are: For areas that will not be grazed 

 or used as hay for livestock, use l/8 lb. of dieldrin, 1 l/2 lb. of toxaphene, 

 l/k lb. of aldrin or l/k lb. of heptachlor per acre. This includes such areas as 

 roadsides, diverted acres, etc. 



On pastures for dairy animals and beef cattle, use l/h lb. of dibrom or 

 1 to 1 1/2 lb. of Sevin per acre. No interval is required between application and 

 grazing. 



For pastures to be grazed only by beef cattle, use 1 l/21b. of toxaphene. 

 If toxaphene is also being applied to the cattle to control flies, allow k2 days 

 between last grazing on treated pasture and slaughter. Do not graze dairy animals 

 on toxaphene- treated forage or pasture. 



