-4- 



Supplement good sanitation and barn sprays with a spray bait material . Use 4 

 ounces of dichlorvos (DDVP) or 2 ounces of naled (Dibrom) in a mixture of 1 gal- 

 lon of clear corn syrup and 1/2 gallon of warm water. Apply this from a small 

 tank sprayer to the favorite fly-roosting areas. 



Barn foggers using insecticides like dichlorvos (DDVP) , pyrethrum, or naled (Di- 

 brom) give a quick kill of flies during the fogging operation (5 to 10 minutes) , 

 but the effect is not lasting. When fly populations become intense, even twice 

 a day fogging fails to provide satisfactory fly control for the farm- -even though 

 the barn is kept temporarily free of flies. As normally used, fogging does not 

 leave enough insecticide deposit on the animals to protect the cattle from flies 

 when on pasture. Coarse sprays applied to the animals are best for this purpose. 



For large drylot and enclosed confinement operations, the use of a space spray 

 applied from a mist blower has been successful . During peak fly periods, treat- 

 ments will be needed every three or four days . The application can be made with 

 cattle present, but avoid direct application to exposed feed and water. Do not 

 apply in conjunction with animal or shelter treatments of organophosphate or 

 carbamate insecticides. This should be the only chemical method of fly control 

 being employed. There is no need to spray cattle in dry lot. The following insec- 

 ticides and rates are suggested for mist blowers: 



Amount per 100 

 Insecticide gallons of water Meth od 



dichlorvos (Vapona) , 2 2 -percent liquid 



concentrate . 2 gallons Apply at 5 gallons of 



finished spray per acre 

 naled (Dibrom) , 3 7 -percent liquid 



concentrate 1 gallon Same as above 



HOMEOWNER INSECT PROBLEMS 



Periodical cicada e mergence is rapidly progressing in northern Illinois. As many as 

 10 cicada nymphs per square foot have been observed emerging from the soil in some 

 areas. Egg- laying has begun and will continue over a period of three or four weeks. 

 A single female may lay 400 to 600 eggs, depositing 12 to 20 in each puncture beneath 

 the bark. These eggs will hatch in six to seven weeks. The tiny nymphs drop to the 

 ground, enter the soil at the base of the plant, and attach to a suitable root. They 

 will remain 'there, sucking sap from roots of shrubs and trees for the next seventeen 

 years. Most adult cicadas live about 30 to 40 days, and probably will have disap- 

 peared by mid- July. 



Sprays of Sevin applied to shrubs or trees when the cicadas are laying their eggs 

 will reduce damage. Use 2 tablespoons of Sevin 50 -percent wettable powder per gallon 

 of water. A repeat application may be necessary in seven days. Young trees and shrubs 

 can be protected by covering them with cheesecloth. 



NOTE : It was incorrectly stated in last week's bulletin that cicadas are "moths." 

 Our apologies! We know the periodical cicada belongs to the order Homoptera (not 

 Lepidoptera) , Family Cicadidae. "Gold stars" are hereby awarded to everyone who 

 caught the error. 



Aphids are appearing on many trees and shrubs -- tul ips , willows, sycamores, maples, 

 poplar, honeysuckles, roses, and others. These small, soft-bodied insects (green, 



