form per acre or 1 1/2 pounds of carbaryl (Sevin) as granules. For spraying, use 

 the same amount of actual insecticide per acre, and direct the spray to the upper 

 third of the plant. Aerial applications should be granules, not sprays or dusts. 

 Allow 10 days between treatment and ensiling of corn when applying diazinon; car- 

 baryl has no waiting period. Commercial applicators may prefer to use EPN or 

 parathion; they also provide good control of the corn borer. Parathion has a 

 12-day waiting period between treatment and harvest; EPN, a 14-day waiting period. 



Corn rootworms are feeding on corn roots in occasional cornfields. The worms are 

 less than half-grown. An exception was a field of 4- to 8-inch corn in the west- 

 central section; in it, almost full-grown northern corn rootworm larvae were caus- 

 ing damage. 



If corn borers and rootworms are a problem in the same field, a granular applica- 

 tion of a phosphate insecticide will give some protection against both pests. 

 Some of the granules will stick in the whorl and kill the borers. The rest will 

 drop to the ground. Use hillers to throw the soil around the base of the plants. 

 This method will not give maximum control of either rootworm or corn borers. For 

 rootworm control, it would be better to concentrate the phosphate at the base of 

 the plants and incorporate by cultivation. 



Garden symphylids were found in the second field of corn on record in Illinois. 

 This is a small, white, centipede -like insect with a pair of legs on each body 

 segment and bead-like antennae. No known insecticide will give good control. Soil 

 insecticides such as aldrin or heptachlor are ineffective. As near as can be de- 

 termined, there is no relation between cropping practice and the incidence of this 

 pest. 



Corn leaf aphids have been found in a few fields in southwestern Illinois. It is 

 still early to determine how serious this insect will be in 1967, since it migrates 

 into Illinois. 



Pale-green leafhoppers have been observed in some young stands of corn. When they 

 are numerous , damage can occur. If they are damaging young corn, carbaryl (Sevin) 

 at 1 pound per acre will control them. 



Livestock Insects 



Stable flies on cattle (both in pasture and drylot) are more numerous than is nor- 

 mal for this time of year. At the same time, face flies are few in number, as 

 are horn flies. Flies on cattle kept in drylot are best controlled by good sani- 

 tation practices (to eliminate breeding sites) and by using barn sprays. Apply a 

 barn spray to the point of runoff, using either dimethoate (Cygon) , diazinon, or 

 ronnel (Korlan) . All are cleared for use in dairy, beef, swine, sheep, and horse 

 barns. Cover feed and water troughs before spraying. Do not spray the animals 

 themselves . 



Flies on animals on pasture are best controlled by spraying the cattle with an in- 

 secticide. For pastured dairy cattle, apply 1 to 2 ounces of an oil -base spray of 

 2-percent Ciodrin per animal every 5 to 4 days. A 1-percent dichlorvos (DDVP) 

 or a 0.1-percent pyrethrin oil-base spray applied at the rate of 1 to 2 ounces per 

 animal every day or two can also be used. Water-base sprays of the same material 

 may be used, but control is less effective. Pay particular attention to the legs 

 and underside of the animals when spraying. 



