-2- 



for slaughter. Only one application of l/h lb. of endrin may be used to within ^4-5 

 days of harvest. Toxaphene granules, 1 l/2 lb. per acre, one application only, can 

 be used, but not on corn for ensilage or stover for dairy cattle or animals being 

 finished for slaughter. 



Corn leaf aphids were numerous in all late -maturing corn fields this week. 

 However, in most fields only occasional plants were heavily infested. After the 

 tassels have emerged, the benefits from control are questionable. 



Malathion, 1 pound per acre, or parathion, l/k pound per acre, is effec- 

 tive. Allow 7 days to elapse between treatment and harvest with malathion and 12 

 days with parathion. 



Parathion should be applied by experienced operators, properly equipped 

 for their own protection. 



Fly populations have increased greatly in the last few weeks and are ex- 

 pected to be a problem well into September. 



House fly numbers are heavy on farms having livestock or needing general 

 clean-up of breeding areas. Calf pens, hog pens, loafing pens, and other areas 

 should be cleaned at least weekly and the manure spread out to dry. The walls and 

 ceilings of livestock barns should be sprayed with diazinon, dimethoate, or ronnel. 

 Baytex, another insecticide, may be used in beef barns, but not in dairy barns. 

 As a supplement to good sanitation and residual sprays, use spray baits of these 

 same materials. A good bait can be prepared by mixing 2 parts corn sirup with 1 

 part water and adding sufficient amounts of the chemical to this mixture. Apply 

 the bait from a small tank sprayer to favorite fly roosting areas. 



A new material, dimetilon, which is available in 2-inch-wide red strips 

 ready to tie or tack up, can be substituted for the spray baits. 



Face flies became much more noticeable this week, particularly in the 

 northern 1/2 to 2/3 of the state. Infestations may become more severe during the 

 month. DDVP sirup baits should be applied regularly to dairy animals by painting 

 a strip of bait on the animal's forehead with a paint brush. Severely attacked 

 beef animals should be brought into a shed or barn for protection. 



DDVP sirup bait can be further diluted with water so that it will pass 

 through a small hand sprayer. Hold the hand sprayer about one foot from the cow's 

 head, and apply l/5 ounce (l to 2 strokes) to each animal after the morning milking. 

 Loose-housed cattle or beef 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. 



For beef cattle, use backrubbers charged with 5.0$ toxaphene, preferably 

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

 backrubber where it will get the most use. Allow 30 days between treatment and 

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

 cattle. 



Stable flies , which suck blood from cattle, breed in wet, decaying straw, 

 hay or similar material. Although they have been quite numerous for several weeks, 

 they have now become very abundant. Use repellents like Tabatrex or R-329 in 



