Looking ahead, after the armyworms mature and pupate, second -generation moths will 

 emerge from the southern and central Illinois wheat fields and move northward. Corn- 

 fields with grassy weeds will be an ideal target on which the adult moths may deposit 

 eggs. No control is needed now, but check fields in July. 



Some reports of poor control of armyworms with toxaphene have been received. This 

 happens because toxaphene is a slow-acting toxicant. However, if good control has 

 not occurred after five days, it probably isn't going to. The extremely warm days 

 last week not only hastened the deterioration of the chemical, but also kept the 

 worms from moving up on the plant and coming in contact with the toxicant. 



SOYBEAN INSECTS 



Leafhoppers have been reported damaging soybeans in western areas of Illinois. These 

 are wedge-shaped, green or grey flying insects. They have been extremely abundant in 

 soybean fields. These insects will suck sap from smooth-leaved varieties. Most Illi- 

 nois varieties have pubescent leaves, and these leafhoppers feed very little on such 

 leaves . Even though you find leafhoppers , look for some other source of damage . 



FORAGE INSECTS 



Small grasshoppers are appearing in fence rows, ditchbanks, grassy waterways, and hay- 

 fields in southern sections. In some localized areas, 'hoppers are extremely abun- 

 dant. Many more grasshoppers will be hatching during the weeks ahead. Hot, dry weather 

 is favorable for survival during the hatching. If you notice, lots of tiny 'hop- 

 pers in fence rows, along ditchbanks, in grassy areas, or hayfields, plan to control 

 them before they move into more valuable crops, such as corn and soybeans. Spray 

 grassy areas with 1-1/2 pounds of toxaphene or 3/4 pound of carbaryl (Sevin) per acre. 

 Use carbaryl on hayfields or pastures. There is no waiting period for carbaryl. 



HOMEOWNER INSECTS 



Forest tent caterpillars are pale blue worms with a white keyhole marking on each 

 segment down the back. Unlike the eastern tent caterpillar, this insect does con- 

 struct tents or webbing, but can quickly defoliate a tree. Carbaryl (Sevin) will con- 

 trol this insect. 



Bagworms have completed hatch in southern Illinois and are feeding and constructing 

 spindle-shaped bags. These bags are small, about 1/2- to 3/4-inch long and feeding 

 is light. As the worms grow, feeding will be more severe. Spraying now in the 

 southern section will control bagworms. Apply carbaryl (Sevin), malathionor Bacillus 

 thuringiensis (Biotrol, Dipel, or Thuricide). 



In the central section of the state hatch has begun and should be complete by June 15. 

 Hatch should be complete in the northern section by June 30. Apply chemical control 

 if needed very soon after hatch is complete to achieve effective control. 



Sod webworm moths are present now in very low numbers. These first generation moths 

 are laying eggs and young webworms will hatch out. In almost all lawn areas the num- 

 ber of webworms in this generation will be at such a low population that no damage 

 will be observed. The next generation of webworms, hatching in late July and early 

 August, can be numerous enough to cause economic damage. This present generation does 

 not need to be treated. 



