-2- 



Common stalk borers are migrating from the hollow-stemmed grasses and weeds in fence rows 

 to other crops. Corn plants along the edges of fields are being killed or severely chewed 

 This striped worm with a brown, purple, or black area around the middle of the body can 

 easily be found in dead or dying weed stems, or in the corn plants. 



We have been asked to make control suggestions, ones to be used only if you insist on tryi;; 

 to control these borers. First, mow the fence row- -a stubble beater would be best. This' 

 will kill some worms, but will drive the worms out of the weeds and grasses in the fence 

 row and into the corn. Therefore, spray the stubble, soil, and first two or three rows o 

 corn immediately- -before the worms get into the corn. Use 2 pounds of 80-percent carbaryl 

 (Sevin) in 20 gallons of spray per acre. This suggestion is only for a trial. 



Garden centipedes (symphylans) are now appearing. Damage may occur to all plants in an 

 area within a field, or only individual plants may be affected. The most-common symptoms 

 are severe plant stunting and purpling, or the plants may die. Root systems are weakened 

 or are nonexistent. Numerous, small, grey -to -white, many legged creatures can be found in 

 the soil around the plants. They disappear very rapidly. If you have this condition, make 

 plans to control them in these areas next year. 



Several different kinds of aphids have been found frequently on corn. None of these are 

 the corn leaf aphid, and none are numerous enough to cause injury. It is too soon to make 

 predictions about the prospects for corn leaf aphids . 



SOYBEAN INSECTS 



Corn-seed maggots have been reported doing damage to stands of soybeans . The maggots 

 attack the seeds during germination, and will also tunnel into the stems afterward. Ohio 

 extension entomologists report the same problem in some areas of that state. If you re- 

 plant, you can use diazinon as a planting-time treatment. However, it is not likely that 

 damage from these maggots would occur with rapid germination; therefore, insecticide might 

 not be needed now. 



LIVESTOCK INSECTS 



The number of flies on cattle now on pasture is building up, particularly in the central 

 and southern sections of Illinois. Fly counts on untreated herds this week showed the 

 following averages: 



Average number flies per animal 

 Section of Illinois Face flies Horn flies Stable flies 



Southern 5 



Central 10 



Northern 2 



An average of one horse fly or deer fly per animal was also found on cattle in the southerr 

 section. The number of flies will increase sharply with warm weather, particularly in the 

 northern section. The wet condition we now have favors the development of flies. Studies 

 have shown that the pasture fly complex will cause a 10- to 20-percent loss in milk or beef 

 production during a normal fly season. 



For control on dairy cattle, apply Ciodrin as a 2-percent oil or water-base spray- -at 1 to 

 2 ounces per animal and 2 to 4 times per week. A 1-percent dichlorvos (DDVP) or a 0.1- 

 percent pyre thrum spray applied at 1 to 2 ounces per animal each day can also be used. 



350 



5 



100 



6 



10 



1 



