-2- 



Watseka had the highest overwintering population. South of this line populations 

 were low. 



Pea aphids are heavily infesting occasional clover and alfalfa fields, 

 particularly in northern Illinois, and damage is occurring in some fields. With 

 present moisture and an increase in temperature, parasites, predators and aphid 

 diseases may help to reduce the population. 



If control is needed, apply one pound of malathion, l/U pound of para- 

 thion or phosdrin or 1/8 pound of demeton. Allow one week between treatment and 

 harvest when applying malathion, 1 day with phosdrin, 15 days with parathion and 

 21 days with demeton. Only one application of demeton can be made per cutting. 

 Demeton, parathion and phosdrin should be applied only by operators experienced 

 in handling organic phosphates. Be sure to clean the weed spray out of the sprayer 

 before using on alfalfa and clover. 



Spittle bug control is still in order if fields average one or more 

 nymphs per stem and the plants are not over 10 inches tall. To control, use l/k 

 pound of lindane or 1 pound of methoxychlor per acre. Lindane does best when air 

 temperatures are over 60 degrees . It will also control clover leaf weevil and aid 

 in controlling pea aphids. Do not apply lindane within one month of harvest or 

 pasture, or methoxychlor within one week. 



Face flies are still more numerous than they were last year. Eggs are 

 being laid, and the new generation will begin to appear within the next few weeks . 

 The population will continue to increase throughout the summer. Start control meas- 

 ures now . 



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

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

 needed. For beef cattle, use 5 percent toxaphene in a backrubber. Homemade back- 

 rubbers work as well as the commercial ones. Run a taut line of h 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 eliminate 

 insecticide residue hazards. 



O M U. %*. *# **.!» « \» \* 



fCK A JV A riift A A A 



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

 Extension Service and Illinois Natural History Survey, in cooperation with the US DA 

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

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



HBP:bm 

 5/19/61 



