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State / County 



Local Groups 



INSECT 



SURVEY 



BULLETIN 



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College of Agriculture 



University of Illinois 



and Natural History Survey, Urbana, Illinois 



U. S. Department of Agriculture Cooperatinq 



THE UBRARV fir fflf 



FOR IMMEDIATE RELEASE 



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I IS 



UNIVERSITY Of ILUNUK 



INSECT SURVEY BULLETIN NO. 5 



April 12, 1968 



This series of weekly bulletins provides a general look at the insect situation 

 (fruit insects excepted) along with suggested, abbreviated control measures. Each 

 individual should check his own fields to determine local conditions. Before ap- 

 plying insecticides, read the labels carefully and follow all precautions. This 

 will not only insure personal safety, but will also prevent residue hazards. 



The alfalfa weevil is damaging alfalfa south of Highway 13. A few fields have 

 already been sprayed. Feeding is more evident than usual on the lower leaves 

 possibly because of the cool weather of recent weeks. Infestations and damage 

 vary from field to field and each field should be judged on an individual basis. 

 At least two and possibly three treatments will be needed to protect alfalfa 

 stands in this area. 



In the area between Highways 13 and 40, larvae are present and feeding i 

 able. Some fields in this area will probably need treatment by the end 

 week (April 19 or 20) . Peak spraying in this area should occur the week^of 

 April 21. 



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In the area between Highway 40 and a line from Watseka to Hardin, weev f rK-ac£)iwi'ty, 

 is just beginning, and it will be at least another 2 weeks before the situation"" 

 becomes critical. 



Apply the insecticide when larval feeding has become apparent on 25 percent or 

 more of the terminals. Serious injury can occur within a few days after this 

 feeding level is reached. 



The recommendations are: 



Experienced commercial applicators who have the proper protective clothing 

 will get best results with methyl parathion applied at 1/2 pound per acre or 

 a special alfalfa weevil spray of azinphosmethyl (Guthion) at 1/2 pound per 

 acre. Azinphosmethyl can be applied only once per cutting . Do not harvest 

 for 15 days after treatment with methyl parathion and for 16 days with azin- 

 phosmethyl . 



The person not properly equipped with protective clothing to use methyl para - 

 thion or azinphosmethyl can use a mixture of 3/4 pound of malathion and 3/4 

 pound of methoxychlor per acre (3 pints of a concentrate containing 2 pounds 

 of methoxychlor and 2 pounds of malathion per gallon) or a mixture containing 



