foot. 



-2- 



To warrant treatment, you should find a minimum of six worms per linear 



Use 1 l/2 pounds of toxaphene per acre, but not on dairy farms or fields 

 adjacent to dairy pasture or forage crops. If you use dieldrin, do not apply more 

 than two ounces of actual per acre, and do not apply on dairy farms or fields ad- 

 jacent to dairy forage crops or pasture. Do not harvest for one week or use the 

 straw for livestock feed. Trichlorfon (Dylox) has label approval for use on wheat, 

 but can not be used within 21 days of harvest, the field can not be used for graz- 

 ing livestock and the straw can not be fed to dairy or beef animals. We have not 

 tried it for armyworm control in Illinois, so we have no records on its effective- 

 ness, but some states are recommending its use for this purpose. 



The best advice about armyworms is not to panic and let anyone talk you 

 into applying an insecticide unless you have actually counted the worms in several 

 areas of the field. Also, remember that armyworms -will be present in large numbers 

 in lodged spots in grain fields and may be difficult to find in the remainder of 

 the field. 



Sawflies are yellowish-green, velvety, transparent -appearing worms. They 

 are abundant in wheat fields at the same time as armyworms, which are distinctly 

 striped. Do not confuse the sawfly larvae with armyworms. 



Black cutworms have been found in low, wet areas of many cornfields 

 throughout eastern, central and western Illinois. Most of them are small to half 

 grown, but some are still hatching. In a few instances they have been serious 

 enough to cause replanting even where fields have had a broadcast treatment of soil 

 insecticide. But most of the small corn plants are cut off above the growing point 

 or heart and will recover from the damage. 



If post-planting treatment is needed, use either l/2 pound of actual 

 dieldrin or 3 pounds of actual toxaphene. Do not use dieldrin or toxaphene on 

 dairy farms or allow the drift to reach dairy pastures or hay crops. For dairy 

 farms, use 2 pounds of actual carbaryl per acre. It will be helpful, but not highly 

 satisfactory. If replanting is necessary, apply a broadcast application of a soil 

 insecticide. Row applications of soil insecticides at planting time have failed 

 to control cutworms. 



Chinch bug adults are in thin stands of wheat in eastern and central 

 Illinois. In some fields 10 to 50 adults can be found per linear foot of drill row. 

 Much of the wheat in this area is winter -damaged; as a result, some fields have 

 been plowed under and planted to corn. Some eggs have been laid and could produce 

 a large buildup of nymphs, which may appear in wheat or on corn planted where wheat 

 has been plowed under. Dry weather is favorable for chinch bug development. Do 

 not apply insecticides unless damage is being caused by the new hatching nymphs. 



Flea beetles are still present in cornfields in the southern half of 

 Illinois, but corn is growing away from the damage and the beetle numbers are dimin- 

 ishing. 



Alfalfa weevil larval populations are decreasing rapidly, and damage is 

 almost over. Adults that are now emerging will feed a little and then hibernate 

 until next spring. 



