-2- 



Under noimal conditions there would not be another generation of these 

 pests In corn this year. But most people would not consider this a normal year. 

 In about two weeks cutworm moth flight is expected, and these moths may deposit 

 eggs in some of the water spots in corn fields. No one actually knows whether this 

 will occur, hut with continued rains and cool weather it is a distinct possibility 

 that we may have a severe cutworm problem in July. Therefore, watch low spots, 

 particularly in late planted cornfields for possible cutworm damage, if weather 

 continues unseasonably cool and wet. 



Armyworms : During the next few weeks watch for this pest in luxuriant 

 and lodged areas in oats, timothy, and other grassy fields in the northern one- third 

 of Illinois. Some small worms are now present, and moths are flying in large num- 

 bers. Armyworms are readily controlled in grain fields with 1/4 pound of dieldrin 

 or 1 1/2 pounds of toxaphene per acre. Usually It takes 1 to 3 days for results to 

 become apparent. Do not harvest the grain for 7 days after treatment. If treatment 

 becomes necessary in grass pastures to protect the pasture or to prevent migrations 

 to adjacent corn fields, use 2 pounds of methoxychlor per acre. Methoxychlor will 

 prevent the worms from feeding, even though actual kill is poor. When using methoxy- 

 chlor, allow 7 days to elapse between treatment and harvest or pasturing. 



Grape colaspis : Spots of stunted purple corn are showing in cornfields 

 on clover sods particularly in the northern one- third of Illinois. In many of these 

 instances grape colaspis larvae have been feeding on the roots. The larvae are 

 mature and are pupating, thus the corn should soon begin to recuperate from their 

 root pruning. 



Hessian fly ; This pest is more numerous in western and southwestern Illi- 

 nois than for several years in the past. They are now in the flaxseed or pupal 

 stage and will emerge this fall to deposit eggs on early seeded wheat. High fall 

 populations can be expected. 



Caution : Before applying insecticides, read labels carefully and follow 

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

 secticide residue hazards. 



********* 



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. 



HBPtmfb 

 7/1/60 



