to make a basal application of an insecticide immediately, using the cultivator to 

 cover the insecticide. Within a week, it will be too late. Use BUXten, carbaryl 

 (Sevin) , diazinon, disulfoton (Di-Syston), parathion (Niran) , or phorate (Thimet) . 

 Direct these at the base of the plant and cover with dirt. 



Corn blotch leaf miners are still being reported. They are extremely numerous in some 

 fields this year. Whether or not they are of economic importance is questionable, but 

 they are often confused with other problems. The adult, which is a fly, makes tiny 

 elongated punctures in groups about 1/16 of an inch long- -usually in the tip of the 

 leaf. The maggot mines between the upper and lower leaf surfaces. A dirty-yellow mag- 

 got can usually be found in these mines . 



.An insect with the scientific name Smyra henrici is now present in cornfields. This 

 caterpillar and others strip the chlorophyll from the lower leaves of the corn. Later, 

 they devour the entire leaf. Although not of importance, the damage is often erroneous 1) 

 thought to be caused by corn borer. 



Corn flea beetles can still be found in cornfields. They will gradually become more 

 abundant late in July and August. 



Corn leaf aphids were found in Pulaski and Alexander counties on sorghum this past week, 

 and in central Illinois this week. None have appeared on corn as yet, but several other 

 aphids (English grain aphid and potato aphid) have been collected from corn. Fortunatel} 

 the corn leaf aphids in Pulaski and Alexander counties were heavily parasitized by a 

 small wasp. No control measures are recommended for this week. 



Thrips are very common in whorls of corn. No economic damage has been observed. 



SOYBEAN INSECTS 



Bean leaf beetles have been feeding in soybeans , but damage is not severe . They eat 

 holes in the leaves. This green to red beetle is hard to find; they drop to the ground 

 at the slightest disturbance. No control is needed now. 



Small grasshoppers can be found in hay-crop fields, in fence rows, and in some cases 

 they are feeding on the leaves of soybeans in the edge of rows. No controls are recom- 

 mended now. 



Southern corn rootworm adults (also known as the spotted cucumber beetle) are present 

 in soybean fields. They eat the surface of the leaves. They are not of enough im- 

 portance to warrant control. 



LIVESTOCK INSECTS 



Barn flies are bothersome particularly in central and southern sections, and populations 

 are expected to increase sharply with the warmer weather. The house fly and the blood- 

 taking stable fly (needle-like beak) make up the barn fly complex. Both flies spend 

 90 percent of their time sitting on barn walls, support posts, fences, etc., and only 

 about 10 percent of their time on the animals. Therefore, there is no need to spray 

 cattle kept on dry lot. Begin controls now before the flies become too numerous. The 

 following program will provide good results: 



1. Practice good sanitation. Eliminate fly-breeding materials- -such as manure, rotting 

 straw, wet hay and feed- -as often as possible. Spreading this refuse where it can 

 dry makes it unsatisfactory for fly development. 



