Variegated cutvorms are still present in clover fields. They are up to 

 one-half inch long. No damage has yet been observed. If damage occurs, it will 

 not be for a few more weeks. 



Grasshoppers are now hatching. Tiny 'hoppers can he found i. southern 

 Illinois, but in low numbers. No general damage is expected. 



Pea aphid populations in alfalfa remain low throughout the state; 

 natural enemies are becoming more common. 



Corn borer pupation ranges from 25 to 70 percent in southern Illinois, 

 and a few moths have emerged. Since survival of first-generation borers is low 

 on mid- season to late-planted corn and the crop is later than normal, 

 damage by first-generation corn borers is not expected in the southern half of the 

 state . 



Since none of the wintering larvae in northern Illinois have pupated, no 

 predictions can be made . 



Corn flea beetles are appearing on corn plants in southern Illinois. 

 As soon as plants appear, watch for these tiny black beetles on the leaves. When 

 extremely abundant, they can damage stands. If necessary, apply 2 pounds of 

 carbaryl (Sevin) or 1 l/2 pounds of toxaphene per acre as a spray banded over the 

 row. 



English grain aphids are present in small numbers in most grain fields 

 but are not damaging the wheat. No control is recommended. 



Upcoming Farm Insect Problems 



Armyworms are present in wheat fields in the southern one-half of Illi- 

 nois. They are still small and are not yet numerous enough to be a problem, but 

 they may increase as more eggs are laid and hatch. 



To find armyworms, examine lodged spots. Shake the plants vigorously, 

 and look on the ground underneath. If small striped worms are present, they will 

 probably be armyworms . Do not use this count as a field average. If you find no 

 armyworms in lodged spots, no further examination will be necessary. If you find 

 lots of them, make a field check. No control is needed unless the field 

 population averages six or more per linear foot. Even then, do not apply insecti- 

 cides until most of the worms are about one -half inch long or longer. 



Do not confuse armyworms with the transparent green to yellow sawflies 

 also found in wheat. An armyworm has five pairs of abdominal prolegs in addition 

 to the three pairs of true legs on the front half of the body. Sawflies have six 

 or more pairs of prolegs in addition to the three pairs of true legs. Sawflies 

 do not damage wheat plants enough to require control. 



Toxaphene, 1 l/2 pounds per acre, may be applied to small grains without 

 any restrictions on use of the grain. However, do not feed the straw to dairy 

 animals or livestock fattening for slaughter. Do not apply toxaphene to fields 

 adjacent to dairy pastures or hay crops. Do not contaminate fish-bearing waters 

 with toxaphene. Carbaryl ( Sevin), 1 pound per acre, may be applied to fields adja- 

 cent to dairy pastures, but not after the heads have begun to appear. Trichlorfon 

 (Dylox), 1 pound per acre, may be used to within 21 days of harvest, but the straw 



