-2- 



too late to effectively control these borers now. There were only occasional 

 fields of early planted corn with sufficient infestations (75 percent or more of 

 the plants with borer feeding) to justify treatment. Most advanced fields of 

 corn have a light number of corn borers. With good survival of this first genera- 

 tion, we could still experience second -generation corn borer problems in some 

 late-maturing cornfields. 



Black cutworms might possibly still appear in cornfields. If a late generation 

 occurs, damage could be extremely severe. Watch fields for an occasional dead or 

 dying plant. Examine such plants to see how large an area has been gouged out of 

 the stalk below the soil level. Examine other areas of the field to see if worms 

 are present, or if this is just an occasional worm doing damage. 



Common stalk borers can still be found in some cornfields. These are whitish- 

 brown, striped worms with a purple band around the middle. They feed in the whorl. 

 Emerging leaves have irregular holes in them. Damage is usually most common along 

 the edge of the fields. The damage is not thought to be serious; by the time 

 injury is noticed, it is too late to apply an insecticide. However, controlling 

 the weeds along the edge of the field and out in the field in August and September 

 will decrease the problem for next year. 



Fall armyworms may soon appear in late-planted cornfields. Areas in a field will 

 have numerous plants with severely chewed leaves. Dark brown, smooth- skinned 

 worms will be found feeding in the whorls of plants. This will appear in "patches" 

 in the field, because the moths deposit a cluster of 50 to 100 eggs on one plant. 

 The worms move to adjacent plants as they hatch, infesting several plants in a 

 row. Control is usually not recommended since the plants usually grow away from 

 the damage. 



In cases of severe damage, try granules of either carbaryl (Sevin) or toxaphene 

 at 1-1/2 pounds of actual chemical per acre. Do not feed toxaphene -treated corn 

 as forage to dairy cattle. Do not feed toxaphene -treated corn as forage or stover 

 to livestock fattening for slaughter within 28 days of slaughter. 



Soybean Insects 



Thrips , commonly found last week in the whorl leaves of corn, are increasing in 

 number on soybeans in some areas. These small, yellow-to-black thrips (about 

 1/16-inch long) rasp the surface of the leaves, giving them a "silvery" appearance. 

 Plants will usually outgrow the damage, and rain helps. 



Small, green, gnat-like leafhoppers are also numerous on soybeans. But as yet, 

 damage is of minor importance and no control is needed. 



Homeowner Insect Problems 



"Cottony" maple scale eggs are hatching, and the young crawlers are moving to the 

 leaves to feed. The eggs appear as cottony masses (like popcorn) on the small 

 twigs and branches. Soft maple is the primary variety attacked, but this scale 

 also feeds on other trees and shrubs. If control is needed, apply within the next 

 two weeks. Use 2 teaspoons of 50- to 57-percent malathion liquid concentrate per 

 gallon of water. 



