-2- 



The mimosa webworm , a relatively new pest in Illinois, has partly de- 

 foliated mimosa and honey locust in some areas in southern Illinois. These gray 

 to "brown worms build nests in which they skeletonize the leaves. A second genera- 

 tion is expected to develop during the next two months. If the worms are still 

 small, apply 2 teaspoons of either 57$ malathion concentrate or 60$ toxaphene, or 

 1 tablespoon of lead arsenate per gallon of water. Combining malathion and lead 

 arsenate has proved very effective in controlling this pest. 



Face flies have "been slower to build up this year than last. Although 

 infestations are still spotted, and are light in southern Illinois, populations are 

 expected to increase throughout the remainder of the summer, particularly in the 

 northern 2/3 of the state. 



For dairy cattle, brush DDVP sirup bait on the foreheads each morning in 

 a strip about 1 inch wide and 6 inches long. The same bait can be further diluted 

 with water so that it will pass through a small hand sprayer. Hold the hand sprayer 

 about 1 foot from the cow's head and apply 1/5 of an ounce (l to 2 strokes) to each 

 animal after the morning milking. Loose-housed cattle are more difficult to treat, 

 but good control can be obtained by spraying twice the amount on the sides and backs 

 of these animals. 



DO NOT USE DDVP SIRUP BAITS LEFT OVER FROM LAST YEAR . They will be in- 

 effective and will increase the problem by attracting more flies to the animals. 



For beef cattle, use backrubbers charged with 5-0$ toxaphene, preferably 

 in a mineral oil base although No. 2 fuel oil can also be used. Place the back- 

 rubber where it will get the most use. Allow 30 days between treatment and slaugh- 

 ter of beef animals treated with toxaphene. Do not use toxaphene on dairy cattle. 



Caution : Before applying insecticides, read the labels carefully and 

 follow all precautions. This not only will insure personal safety, but will also 

 eliminate insecticide residue hazards. 



mUtif \» \r \* %* \» \* 



7tvrnr snm a " a~k 



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

 Agricultural Extension Service and Illinois Natural History Survey, in cooperation 

 with the USDA Agricultural Research Service, Plant Pest Control Branch, from in- 

 formation gathered by entomologists and cooperators who send in weekly reports from 

 their own localities. 



HBP:bb 

 7/6/62 



