If corn is planted in these resistant rootworm fields, use one of the organic 

 phosphate insecticides as a basal application during cultivation. Organic phos- 

 phates applied to corn planted prior to May 15 may not be entirely effective, 

 since they do not control rootworms hatching in late June or early July. Planting- 

 time applications of an organic phosphate applied to corn after May 15 should con- 

 trol rootworms. 



Organic phosphate insecticides are the only effective means of controlling resist- 

 ant rootworm populations. The following organic phosphate insecticides have label 

 approval and are recommended for the control of resistant rootworms in Illinois: 



Rate per acre 



phorate (Thimet) 1 pound 



Buxten 1 pound 



diazinon 1 pound 



disulfoton (Di-Syston) 1 pound 



parathion 1 pound 



A basal application of the insecticide can be made during cultivation. A special 

 applicator on the cultivator directs the phosphate granules at the base of the 

 plant and dirt is thrown over this deposit. 



Special Reminder: Agronomy Day Is June 15 



You'll have a chance to get an up-to-the minute report on the insect situation on 

 Agronomy Day- -June 15, at the Agronomy South Farm, Urbana. The Extension Ento- 

 mology staff will be on hand to discuss current insect problems. We'll be happy 

 to discuss specific insect problems you may have in your area. 



Besides insect information, you'll get information on 18 Agronomy Department re- 

 search projects that are intended to improve farming. The 3-hour tours of research 

 projects begin at 7 a.m. Tours will leave every 10 minutes thereafter until 1 p.m. 

 If it rains, the group will meet in the east side of the football stadium. 



CAUTION: BEFORE APPLYING INSECTICIDES, READ THE LABELS CAREFULLY AND FOLLOW ALL 

 PRECAUTIONS. THIS WILL NOT ONLY INSURE PERSONAL SAFETY, BUT WILL ALSO 

 PREVENT RESIDUE HAZARDS. 



NOT FOR PUBLICATION; SPECIAL NOTE TO FARM ADVISERS 



There have been questions from homeowners regarding the effectiveness of light 

 traps sold for insect control- -especially mosquitoes and flies. Not all harmful 

 or pesky flying insects are attracted to light- -especially many flies, gnats, and 

 mosquitoes. If the light traps are nearby, they may actually increase insect dam- 

 age in a vegetable garden. There are more effective means of insect control for 

 the homeowner than the light trap. 



********** 



This weekly report was prepared by H. B. Petty, Steve Moore, Roscoe Randell, and 

 Don KuhLman, University of Illinois College of Agriculture and Illinois Natural 

 History Survey, in cooperation with USDA Agricultural Research Service, Plant Pest 

 Control Branch, from information gathered by entomologists and cooperators who send 

 in weekly reports from their own localities. 



