5. Azinphosmethyl or methyl parathion should not be used on fields close to harvest 

 that need treatment. Switch to one of the other suggested insecticides, such as 

 malathion, that has no waiting period. 



Clover leaf weevils are present in all clover and alfalfa fields. Populations are 

 generally low. A fungus disease has killed many of them in the central and southern 

 sections. 



Pea aphid populations on clover and alfalfa remain light, and no damage is evident. 

 Some pea aphids are being killed by parasites. These are the brown ones (not green) 

 that are attached to the leaves. 



Potato leafhoppers are continuing to migrate into Illinois from the south. These are 

 the tiny, green, wedged-shaped insects that skid sideways when disturbed. They cause 

 a yellowing of second- and third-crop alfalfa. No control measures are needed now. 



CORN 



Black cutworm moths have been flying for several weeks . Watch the spots in cornfields 

 that are low or wet, or the poorly drained, for damage. Cut or missing plants are a 

 sign that cutworms may be at work. If damage appears, use a spray- -directed at the 

 base of the plants- -of carbaryl (Sevin) at 2 or 3 pounds, diazinon at 2 pounds, toxa- 

 phene at 3 pounds, or trichlorfon (Dylox) at 1 pound of actual chemical per acre. It 

 is best to use at least 20 gallons of water per acre, and to cover the spray band by 

 throwing soil at the base of the plants with a cultivator. 



Bristly cutworms and sod webworms are feeding on corn planted on sod. The worms are 

 cutting the plants above the growing point, but the plants will recover. In two fields 

 in the western section, feeding was observed on as much as 10 to 20 percent of the 

 plants. No control will be needed unless the worms begin to eat the heart, causing 

 the plants to die. Carbaryl (Sevin), diazinon, and trichlorfon (Dylox) --applied as 

 suggested for black cutworms- -should provide effective control for these insects. 



Seed corn beetles are numerous in many cornfields or in those soon to be planted. 

 Diazinon, Dasanit, Dyfonate, and phorate (Thimet) --applied as a 7-inch band ahead 

 of the press wheel- -will control these beetles. Diazinon seed-treater will also 

 prevent damage from this insect. 



Corn flea beetles were found feeding on newly- emerged corn this week. No serious injury 

 has yet been reported. Watch closely sweet corn in the southern section that was 

 planted early. These small, black, shiny beetles that jump when disturbed leave white 

 scratch marks on the leaves. Damaged plants first turn white or silvery, and are some- 

 times killed later on. If damage is severe and plants are being killed, apply 3/4 pound 

 of carbaryl (Sevin) --preferred on dairy farms- -or 1-1/2 pounds of toxaphene per acre as 

 a band spray over the row. To prevent additional flea beetles from moving into the 

 corn, treat the grassy areas bordering the field. Do not use carbaryl near bee hives 

 or toxaphene near fish-bearing waters. 



Corn borer pupation is well along in the southern part of the state, and a few moths 

 have emerged. Pupation is just beginning in the central section. No pupation of borers 

 has occurred in the northern area. Reports on corn -borer development were received this 

 week from Les Rogers at Salem, Charles Orcutt at Marshall, Warren Bundy at Edwardsville, 

 Bob Hayward at Mt. Sterling, Bill McAllister at Carlinville, Earl Lutz at Ridgway, and 

 Jim Paullus at Rochelle. There are many overwintering borers in the southern and 

 western sections. 



