FOR IMMEDIATE RELEASE July 13, 19o2 



INSECT SURVEY BULLETIN NO. 13 



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. 



Grasshoppers : The situation remains about the same as in the past few 



weeks except that the grasshoppers are growing larger. Hatching is complete or 



nearly so in the southern two-thirds of the state; it is well started in the northern 

 third and will probably be complete within the next week to ten days. 



At present grass and legume fields are more severely infested than other 

 crops, and as long as there is sufficient food for the 'hoppers they will remain in 

 these fields. Inspect hay crop fields. When defoliation occurs or the hay is cut, 

 the 'hoppers will migrate in search of food. Soybeans, corn or any other green 

 food will be attacked. 



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

 used as hay for dairy cattle or livestock fattening for slaughter, use 1/8 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 or beef cattle, use 3/k 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/2 lb. 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. 



For hay crops, apply 3/k lb. of dibrom, 1 lb. of malathion or 1 to 1 l/2 lb. 

 of Sevin per acre. No interval between application and harvest is required for 

 Sevin. Allow k days when using dibrom and 7 days for malathion. Diazinon, 1/2 lb. 

 per acre, can be used on alfalfa, with 7 days between application and harvest. A 

 single treatment of 1 oz. of dieldrin per acre may be applied to hay crops, but not 

 after the new growth is over six to eight inches high or within 35 days of harvest. 



For corn or soybeans, apply 1/8 lb. of dieldrin or 1 1/2 lb. of toxaphene per 

 acre. Do not apply toxaphene to corn or soybeans to be used for hay, ensilage or 

 stover for dairy cattle or animals being finished for slaughter. Dieldrin, l/8 lb. 

 per acre, can be applied to corn to within kO days of harvest or ensiling and to 

 soybeans to within 60 days of harvest or feeding. One ounce of dieldrin per acre 

 may be applied to soybeans to within 35 days of harvest or feeding. 



Black cutworms : We received one report of damage to corn this past week. 

 At this stage of corn growth, black cutworms hollow out the stalk below ground level. 

 The first symptom of damage is wilting and dying of stalks in low wet spots in fields. 

 With severe infestations this damage becomes quite noticeable on the first hot day. 

 If control becomes necessary, direct the spray at the base of the plant and use 3 lb. 

 of toxaphene or l/2 lb. of dieldrin per acre. The greater the quantity of water you 

 use, the tetter the results will be. 



