-3- 



As a rule of thumb, the minimum average population requiring control is 6 per 

 linear foot of row. To determine the field average, shake the plants over the 

 center of the row and count the worms in several places in the field. 



Use 11/2 pounds of toxaphene per acre or 1 pound of carbaryl (Sevin) per acre 



to control these pests. When using toxaphene, do not feed treated forage to dairy 



animals or livestock fattening for slaughter. 



Leafhoppers are still abundant in soybeans. These small, green gnatlike insects 

 are the same leafhoppers that attack alfalfa. When attack is severe, they cause 

 leaves to yellow and brown (die back from tip). If needed, a spray containing 

 1 pound of malathion per acre for soybeans will control this insect. 



Homeowner Insect Problems 



Fall webworm caterpillars were observed defoliating apple, birch, and shade trees 

 this week. These pale-green or yellow worms with a dark stripe down their backs 

 extend a webbing over the branches and strip the leaves inside as they grow. 

 They skeletonize the leaves, which then curl and dry up. Small trees and shrubs 

 may be completely webbed over by the time the caterpillars mature. Carbaryl ap- 

 plied as a spray is effective. To mix, use 2 tablespoons of 50-percent wettable 

 powder per gallon of water. 



Leafhoppers are abundant around street lights and house lights. These wedge- 

 shaped insects may appear in swarms at night. A space spray of pyrethrins or 

 dichlorvos (DDVP) applied from a pressurized spray can will provide a quick knock- 

 down and temporary relief. For control on lawns, apply carbaryl as a spray or 

 granule. Use 2 tablespoons of Sevin (50-percent wettable powder) per gallon of 

 water, or 1 1/4 pounds of actual carbaryl per 5,000 square feet. 



Millipedes can be a problem at this time of year. These many- 

 legged, brown, wirelike insects migrate from waste areas to areas 

 in and around homes. If they become a problem, apply carbaryl or 

 diazinon as a spray to the foundation of the house for 3 or 4 feet 

 into the yard. 



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. 



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 the USDA Agricultural Research Service, Plant 

 Pest Control Branch, from information gathered by entomologists and cooperators 

 who send in weekly reports from their own localities. 



