2. Persons not equipped with protective clothing . Use: (1) Imidan at 1 pound per 

 acre; (2) a mixture of 3/4 pound of malathion and 3/4 pound of methoxychlor per 

 acre; (3) a mixture containing at least 1/3 pound of diazinon and 1 pound of 

 methoxychlor (Alfa-Tox) per acre; or (4) 1-1/4 pounds of malathion per acre on 

 days when air temperatures will be about 60° F. for several hours after appli- 

 cation. Do not harvest for 7 days after treatment with Imidan, methoxychlor, 

 diazinon, or mixtures of them. There is no waiting period for malathion. Do 

 not apply Imidan more than once per cutting. 



SMALL GRAINS 



Armyworms may soon appear in lodged areas in wheat fields , but none have been found 

 as yet. Shake plants in lodged areas vigorously, and examine the ground underneath 

 for small worms. Armyworms do not need to be controlled until they are about 3/4 

 inch long as they do little damage until they are about two-thirds grown. Report 

 any infestation to your county Extension adviser. 



HOMEOWNER INSECT PROBLEMS 



Tree borers have begun feeding under the bark of trees. Check for sawdustlike frass 

 being pushed out of holes in the bark. These holes may be on the trunk at ground 

 level or higher, or even on the limbs. Some limbs may already have been killed, es- 

 pecially on birch trees. 



Bronze birch borers usually first attack birch trees in the upper trunk and limbs. 

 The infested areas will have uneven raised areas in the bark. The adult beetles 

 will soon be emerging from the bark, leaving small D-shaped exit holes. These 

 beetles will be laying eggs in the central part of the state beginning in late 

 May. For control, thoroughly spray the infested limbs with a spray containing di- 

 methoate (Cygon, De-Fend) using 1 quart of the 2-pounds-per-gallon liquid concen- 

 trate per 100 gallons of water. Spray birch trees in central Illinois in late May 

 and repeat again three weeks later. Apply the treatments one week earlier in the 

 southern section and one week later in the northern section. 



This same spray schedule is effective against flat-headed apple borers which may 

 attack many species of shade trees, especially newly- set trees. Wrapping the trunk 

 with heavy paper for two years after the trees are set will help protect them from 

 borer attack. 



Spring cankerworms , commonly called "inchworms," are hatching and feeding on tree 

 leaves and buds in northeastern Illinois. This insect is a dark-green or black 

 worm with three pairs of true legs plus two pairs of smaller prolegs on the under- 

 side of the abdomen. There is one yellow stripe along the body of the cankerworm. 



Spring cankerworms feed on elm, apple, and many other trees, stripping the foliage. 

 This defoliation does not kill a tree, but it does stunt young trees, and repeated 

 attacks year after year will kill a tree. 



If worms are feeding, a spray containing carbaryl (Sevin) is effective. Use 2 

 pounds of 50-percent wettable powder per 100 gallons of spray. A bacterial or 

 biological agent, Bacillus thuringiensis , is also an effective control material. 

 It is sold as either Biotrol, Dipel, or Thuricide. Follow label directions as to 

 the amount of either one to use in a spray mixture. A band of sticky material 

 around the trunk of the tree does help prevent egg-laying if applied in February 

 but will be of no value if used at this time of the year. 



