-2- 



organic phosphate insecticide at 1 pound per acre, may be used to within 21 days 

 of harvest, hut the straw cannot he used for livestock feed. 



Malathion, 1 l/k pounds per acre, may be beneficial for controlling 

 armyworms in areas where drift may be critical. It may be used on grass pastures 

 and hay right up to the day of harvest. Allow one week to elapse between appli- 

 cation and harvest of grain. 



Examine grassy pastures and hay fields. If armyworms are extremely 

 abundant and are devouring the grass, apply 1 pound of carbaryl (Sevin) per acre. 

 There is no waiting period between application and harvest . Warn beekeepers that 

 you are applying carbaryl. 



Black c utworms were found in cornfields this week. In the central 

 section, the worms were l/2 to 3 A inch long, or about one-third grown. They 

 will feed for another two weeks before pupating. Most of the corn plants were 

 cut or eaten above the growing point or heart and will recover from the damage. 

 Check the low spots in cornfields regularly, and watch for missing plants, cut 

 plants or wilting plants . The small gray to black worm can usually be found in 

 the soil near the damaged stalk. 



If the stand is being threatened or low spots in a field are seriously 

 damaged, apply 3 pounds of toxaphene per acre and direct the spray at the base 

 of the plants. Cultivate immediately to cover the spray deposit. Results will 

 depend to some extent on the soil moisture and on rain immediately after spraying. 

 If conditions remain dry, the worms will be down several inches in the soil and 

 control will be poor. 



On dairy farms, use 2 pounds of carbaryl (Sevin) per acre. This treat- 

 ment will help to control small worms but will not kill the large cutworms. 



Wireworms continue to damage corn in some areas. Little can be done 

 to protect the planting. If the stand is lost, apply 2 pounds of aldrin or 

 heptachlor per acre, disk in immediately and replant. A spray may give quicker 

 kill than granules. Be careful to avoid drift when spraying. 



Alfalfa weevil damage is about over as worms continue to mature, stop 

 feeding and pupate. In the area south of Highway 50, spraying of new growth (sec- 

 ond cutting) may still be justified in occasional fields. Watch the new growth 

 closely for several days after cutting. If new shoots do not develop, look for 

 the small green larvae or the l/4-inch brown snout beetle adults of the alfalfa 

 weevil. If either the larvae or adults are numerous, use malathion or a commer- 

 cial mixture of diazinon and methoxychlor (Alfatox) . Allow one week to elapse 

 between application and harvest when using diazinon or methoxychlor; no waiting 

 period is needed for malathion. Azinphosmethyl (Guthion) or methyl parathion can 

 be used for weevil control by those equipped to follow precautions for personal 

 safety when handling and applying the more toxic insecticides. 



Upco mi ng Farm Insect Problems 



Com borer pupation is complete in the southern one-third of Illinois; 

 20 to 50 percent of the moths have emerged, and egg laying has started. Egg lay- 

 ing will continue for another two or three weeks. Where needed in field corn, 

 •iriH<i.-hirvi flpp Phonld probably be applied beginning the week of June 12. 



