If the present stand is adequate, it would be wise to spray with 1 1/2 to 

 2 pounds of aldrin or heptachlor directed at the base of the plant. Wireworm feeding 

 may continue for 2 or 3 weeks. Follow this application immediately with cultivation, 

 throwing as much dirt as possible up around the plants. 



Black cutworms are now appearing in some areas of central and western Illi- 

 nois, but may appear in other areas during the next two weeks. If the stand can still 

 be saved, apply l/2 pound of dieldrinor 3 pounds of toxaphene, directed at the base 

 of the plant, and follow with immediate cultivation. Examine stands of corn in low 

 areas in the fields for this pest. Treatment after the worst damage has been done 

 is not economical. The larger the worms, the more difficult they are to kill, so 

 early treatment pays off. In flooded areas, broadcast 1 l/2 pounds of aldrin or 

 heptachlor per acre, and disk in before planting to safeguard against later attack. 



Corn borer emergence has just begun in southern Illinois. Pupation is ap- 

 proximately 50 percent complete in central Illinois and 10 to 25 percent in northern 

 Illinois. Corn borer development is about a week later than last year and about the 

 same as in 1956, when first- generation borer survival was very high. 



Greenbugs have been collected in Illinois on small grains, but the popula- 

 tion is extremely low. Eeport to your county farm adviser any dead or dying spots in 

 small grain fields in which plant6 are heavily infested with aphids. 



Pea aphid s are still serious in some alfalfa and red clover fields in 

 northern Illinois. It is too close to harvest to use insecticides except for 1 pound 

 of malathion, which requires one week between treatment and harvest or pasture. The 

 best suggestion is to cut the hay crop now, salvage what can be used and then spray 

 the new growth if the aphids continue. Lindane, 0.3 pound per acre, can be used at 

 that time as well as malathion. Allow one month to elapse between treatment with 

 lindane and harvest. 



Bagworms, if not already hatching, soon will hatch in southern and central 

 Illinois. After hatch is complete, apply a spray made with 2 teaspoons of 57 percent 

 malathion concentrate, 3 teaspoons of 60 percent toxaphene concentrate or 1 tablespoon 

 of lead arsenate per gallon of water. A second application two weeks later may be 

 needed. Do not apply malathion to Cannart red cedar, as injury may occur. 



Caution : Before applying insecticides, read labels carefully and follow 

 all precautions. This not only will insure personal safety, but will also eliminate 

 insecticide residue hazards. 



AAHAnJVAAH 



This weekly report was prepared by H. B. Petty, Illinois Agricultural Ex- 

 tension Service and Illinois Natural History Survey, in cooperation with the USDA 

 Agricultural Service, Plant Pest Control Branch, from information gathered by ento- 

 mologists and cooperators who send in weekly reports from their own localities. 



HBP:bl 

 6-2-61 



