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INSECT 



SURVEY 



BULLETIN. JUN io ■■:X«^ 



College of Agriculture . ,,, f 



University of Illinois 



and Natural History Survey, Urbana, Illinois 



U. S. Department of Agriculture Cooperating 



May 3, 1968 



INSECT SURVEY BULLETIN NO. 8 



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

 (fruit and aommeraial vegetables excepted) , along with suggested, abbreviated 

 control measures. Each individual should check his own fields to determine local 

 conditions. The plant disease report was prepared by the Department of Plant 

 Pathology , the insect situation by the Department of Agricultural Entomolgy and 

 the Illinois Natural History Survey, and the weed report by the Department of 

 Agronomy and the Illinois Natural History Survey. 



FIELD CROP PEST PROBLEMS 



Insects 



Alfalfa weevil development has returned to normal speed, with the warmer weather 

 of the past week. Egg hatch and larval feeding have greatly increased. Most 

 alfalfa fields in the area south of a line from Harrisburg to Carbondale have been 

 treated once, sometimes twice. Treatments should have been applied this past week 

 to most alfalfa fields south of Route 50. Alfalfa stands are growing rapidly with 

 the warmer weather. First cutting of alfalfa will be occurring in a week to 10 

 days in the southern part of the state. In general, insecticide treatments have 

 been effective in this heavily infested area. 



The alfalfa is still ahead of the weevil, especially where the first treatment was 

 timed correctly. In many instances, the second treatment can be delayed until 

 after cutting the first crop. Remove the first crop along with many eggs in the 

 stems and treat the new growth of the second crop. 



Next week, egg hatch and larval feeding will increase in areas to the north of 

 Route 50. Treatments will need to be made on some fields in the area up to a line 

 through Jerseyville to Pana to Paris during the week of May 6. 



Watch for weevil feeding; when 25 percent of plant terminals show feeding, apply 

 an insecticide. However, some fields may not require treatment if cut early. 

 Weevil feeding will continue for another three weeks. 



The insecticide recommendations are: 



1. Experienced commercial applicators who have the proper protective clothing will 



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get the 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, 16 days for azinphosmethyl . 



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

 thTon or azinphosmethyl can use a mixture of 5/4 pound of malathion and 5/4 

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



