-2- 



Sggfly larvae feed on -wheat leaves. Ordinarily they are of no economic 

 importance, and control measures are rarely recommended. A sawfly has at least six 

 pairs of abdominal prolegs compared with four pairs for the armyworm. Sawflies are 

 easily confused with true armyworms. In making armyworm counts, do not include 

 sawfly larvae. 



Face flies are still numerous on cattle in the northern one half of the 

 state. In addition, populations warranting treatment were observed this week as 

 far south as St. Louis. 



For dairy cattle, apply DDVP commercially prepared face fly "bait daily to 

 the animal's forehead for the next 2 to 3 weeks and then every 3 to 5 days as needed. 

 For beef cattle, use 5 percent toxaphene in a backrubber. Homemade backrubbers work 

 as well as commercial ones. Run a taut line of k to 6 strands of barbed wire from 

 a post about 5 feet above ground to a stake in the ground about 9 feet away, and 

 wrap with gunny sacks. Saturate with the toxaphene solution. Place the backrubber 

 where it is readily accessible and will be used. Do not treat cattle with toxaphene 

 within 28 days of slaughter. 



Caution ; Before applying insecticides, read labels carefully and follow 

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

 nate insecticide residue hazards. 



This weekly report was prepared by H. B. Petty, Illinois Agricultural Ex- 

 tension Service and Illinois Natural History Survey, in cooperation with the USDA 

 Agricultural Service, Plant Pest Control Branch, from information gathered by en- 

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



HBPrbl 

 5/26/61 



