-4- 



tin cans, childrens ' toys, storm sewers, etc. (2) Apply a water-base spray con- 

 taining 1-percent malathion (2 ounces of 50- to 57-percent liquid emulsion concen- 

 trate per gallon of water) to shrubbery and tall grass. Repeat the treatment every 

 week or two if needed. (3) Keep the screens on doors and windows in good repair. 

 (4) Hang plastic resin strips (2" x 10") containing 20-percent dichlorvos (DDV))-- 

 one strip per 1,000 cubic feet of space, or about one per room. These strips will 

 kill mosquitoes and flies for 4 to 6 weeks. As an added precaution, hang the 

 'strips where children can't reach them and away from fish bowls and food counters. 

 A 0.1-percent pyrethrin space spray- -applied from a pressurized spray can--can be 

 used for quick knockdown in place of the dichlorvos resin strips. Frequent treat- 

 ments will be needed during problem periods. (5) When entering mosquito -infested 

 areas, use a repellent. One of the most effective mosquito repellents is DEET 

 (diethyl to luamide) . (6) For quick knockdown at cookouts , outdoor parties, or pic- 

 nics, use either 0.1 -percent pyrethrin or 0.5- to 1 -percent dichlorvos (DDVP) as 

 an oil- or water-base space spray. Spray the mist lightly beneath tables and 

 chairs and into the air for a few feet around the area. Repeat the treatment as 

 needed. 



Sod webworm moths can be seen flying over lawns at dusk. They hide in the tall 

 grass and shrubbery during the day. These buff -colored moths have been laying 

 eggs for the last 2 to 3 weeks. If the worms are going to be a problem, they 

 should be causing damage by now. Brown, irregular spots in the lawn are an indi- 

 cation of possible webworm damage. The worm stage hides in the thatch and is dif- 

 ficult to find. Their silken-lined tunnels, droppings, and cut pieces of grass 

 are more apparent. If treatment becomes necessary, apply 2 pounds of actual car- 

 baryl, 1 pound of actual diazinon, or 1 1/4 pounds of actual trichlorfon per 

 10,000 square feet. Apply the amount of insecticide suggested in at least 25 gal- 

 lons of water. Do not water for 3 days after treatment. Granular forms of the 

 same insecticide can be applied from a fertilizer spreader in place of the spray. 



Fall webworms continue to defoliate certain shade trees and shrubs. They can be 

 controlled by spraying with carbaryl. Use 2 tablespoons of the 50 -percent wettable 

 powder per gallon of water (2 pounds per 100 gallons) . 



********** 



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. 



