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FOR IMMEDIATE RELEASE UMVtltMll UfelLmMJlS July 6, 19 62 



INSECT SURVEY BULLETIN NO. 12 



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. 



Grasshoppe rs: Hard, beating rains, particularly in northern Illinois, 

 where grasshoppers are still small, may have helped to reduce the grasshopper prob- 

 lem this week. Farther south, where 'hoppers were larger, rains may not have been 

 so beneficial. Check closely for the next few weeks to determine the situation. 

 Typical areas to check are clover, alfalfa and grass sods, grass waterways, ditch 

 banks and similar areas. 



Grasshoppers will soon be migrating in numbers to soybeans and corn in the 

 southern part of the state. If they are abundant in grain and legume fields, be 

 prepared to protect adjacent bean and corn fields. In some instances they may dam- 

 age only marginal rows; in other instances they may damage the entire field. 



If 'hoppers are extremely numerous in diverted acres, fence rows, ditch 

 banks, grass waterways, roadsides and similar areas, apply 1/8 lb. of dieldrin, 

 1 1/2 lb. of toxaphene, l/k lb. of aldrin or l/k lb. of heptachlor to areas that 

 will not be grazed or used as hay for dairy animals or livestock fattening for 

 slaughter. 



When treating hay crops or pastures, use 2>/k lb. of dibrom, 1 lb. of 

 malathion or 1 to 1 1/2 lb. of Sevin per acre. (Grasshoppers in many areas are now 

 over half -grown, so the rate of Sevin should be increased.) Allow k days to elapse 

 between treatment with dibrom and harvest and one week with malathion. No interval 

 is required with Sevin when used on hay or pasture or with dibrom when used on pas- 

 ture. Diazinon, 1/2 lb. per acre, can be used on alfalfa for hay with a 7-day in- 

 terval between treatment and harvest. Toxaphene, 1 1/2 lb. per acre, can be used 

 on permanent pastures only, and for beef cattle only. If toxaphene is also being 

 applied to the cattle to control flies, allow k2 days to elapse between last grazing 

 on treated pasture and slaughter. Do not graze dairy animals on toxaphene -treated 

 forage or pasture. 



Our Illinois recommendations and precautions for insecticides used on 

 forage and hay crops are conservative. In some instances labels are more generous 

 than our recommendations, but may be followed if desired. For example, a single 

 treatment of 1 ounce of dieldrin may be applied to hay crops to control grasshoppers, 

 but not after the new growth is 6 to 8 inches tall or within 35 days of harvest. 

 This procedure must be followed exactly to prevent illegal residues on hay crops. 



To protect seedings in small grain, apply l/8 lb. of dieldrin or 1 1/2 

 lb. of toxaphene. Do not treat within one week of harvest of the grain; with toxa- 

 phene on barley, however, allow a two-week interval. To protect corn or soybeans, 

 apply 1/8 lb. of dieldrin or 1 1/2 lb. of toxaphene per acre. Do not apply toxa- 

 phene to corn or soybeans to be used for hay, ensilage or stover for dairy cattle 

 or animals being finished for slaughter. Up to 1/4 lb. of dieldrin may be applied 

 to corn or soybeans provided there is an interval of 60 days between application and 

 harvest or feeding to livestock. 



