-3- 



at least 18 inches wide. This bare soil serves as a barrier to the mites. Re- 

 planting this strip to such flowers as zinnia, marigold, chrysanthemum, or salvia 

 (which do not attract clover mites), will prevent clover mite problems next year. 



Cluster flies (attic flies) are a nuisance in some homes. The adult flies entered 

 houses and buildings last fall to get shelter for the winter. Since attics and 

 basements are not as carefully sealed as other areas, large numbers of flies can 

 gather there. With the onset of warm, sunny days, they become active and leave 

 the partitions and voids to congregate at windows. Clusters sometimes include 

 thousands of flies. Though they are a nuisance, cluster flies don't injure 

 either persons or materials. They are slightly larger and more sluggish than 

 house flies. 



The best indoor control is 20-percent dichlorvos (DDVP) resin strips placed in 

 attics, basements, and other fly- infested rooms. One strip per 1,000 cubic feet 

 (one strip per average room) is effective about 4 to 6 weeks. Do not use in 

 rooms where tropical fish are present or in pet shops . 



CAUTION: REMEMBER- -READ THE INSECTICIDE LABEL AND FOLLOW ALL PRECAUTIONS 

 CAREFULLY. 



This weekly re-port was prepared by H.B. Petty, Steve Moore, Rosaoe Randell, Don 

 Ruhlman, and Stephen Sturgeon, Illinois Natural History Survey and University of 

 Illinois College of Agriculture , in cooperation with the USDA Agricultural Re- 

 search Service, Plant Pest Control Branch, from information gathered by entomolo- 

 gists and cooperators who send in weekly reports from their own localities. 



