■5- 



Blaak widow 

 spider 



Infested areas in homes and buildings should be sprayed with 

 2-percent chlordane or 5-percent DDT from a pressurized spray 

 can. In addition, apply 2-percent chlordane as a water-base 

 spray to the outside foundation wall of your home in the spring 

 and fall to help prevent spiders and other insects from enter- 

 ing. 



Chiggers annoy campers, picnickers, hikers, fishermen, berry 

 pickers--even homeowners in their yard on occasion. These tiny 

 mites burrow into a skin pore and cause a red blotch. The 

 blotches itch and do not subside for a week or more. There is 

 little that can be done to alleviate the problem once the mites 

 become embedded. The mites attack where clothing is tight 

 against the skin. 



When entering possible chigger- infested areas, use a repellent such as DEET (di- 

 ethyltoluamide) . Take a warm, soapy shower or bath immediately after returning 

 from a chigger- infested area. It takes the mites several hours to penetrate into 

 the skin; they can often be washed off before becoming embedded. 



To reduce chigger infestations in a home yard, spray lightly over grass, low 

 flowers, and shrubs with either malathion or diazinon. 



First-generation mimosa webworms will be hatching soon on honey locust and mimosa 

 trees. These are small, gray -to -brown, striped, active caterpillars that use a 

 silken thread to tie a bunch of leaflets together. They skeletonize these leaflets 

 and then form a new nest. The old nest turns brown and the leaflets die. There 

 will be a second generation and possibly a third generation later on. Spray in- 

 fested trees with malathion, using 2 teaspoons of emulsion concentrate per gallon 

 of water. This is 1 quart in 100 gallons of water. Repeat treatments may be needed. 



Euonymus scale crawlers are setting up housekeeping on the branches and leaves of 

 euonymus . The male scales are white and quite conspicuous ; the female scales are 

 brown and less readily seen. Infested plants should be sprayed immediately and 

 again in about two weeks. Apply malathion, using 2 teaspoons of 50-to-57-percent 

 emulsion concentrate per gallon of water. 



Begin bagworm spraying in the central sections this week. Carbaryl (Sevin) , mala- 

 thion, diazinon, or lead arsenate are all effective. Follow label directions and 

 check the plants that may be injured if sprayed with the insecticide you are using. 



In the southern half of the state, first generation elm leaf beetles are skele- 

 tonizing the leaves of Chinese elms, and to some extent other species of elms. 

 These small, dirty yellow-to-black worms can be found on the undersides of leaves. 

 If control becomes necessary, spray with carbaryl (Sevin), using 2 pounds of 50- 

 percent wettable powder per 100 gallons of water; with lead arsenate, use 4 pounds 

 of wettable powder per 100 gallons of water. An additional treatment may be needed 

 for second- generation worms in late July or August. 



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 USDA Agricultural Research Service, Plant Pest 

 Control Branch, from information gathered by entomologists and cooperators who 

 send in weekly reports from their own localities. 



