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Corn leaf aphids : At what stage of plant development this aphid actually 

 damages the corn is not known, but the greatest damage probably occurs during the 

 pretassel to early tassel stage. This is also true of sorghum. In severe infes- 

 tations to corn, apply 1 pound of malathion per acre. Since the effect of aphid 

 control on yield is not known, this treatment should be tried only on a small scale 

 and accurate yield records should be taken. One-fourth pound of parathion or phos- 

 drin may be applied, but only by operators experienced in handling and applying them. 

 One day should elapse between applications of phosdrin and harvest, 7 days with 

 malathion, and 15 days with parathion. These materials should be applied to sorghums 

 in the early boot stage. Allow three days to elapse between application of phosdrin 

 and harvest, 7 days with malathion, and 21 days with parathion. 



Armyworms : Infestations of this worm have been reported from grassy fields 

 of corn in northern Illinois. If leaf feeding becomes severe, apply X/h pound of 

 dieldrin or 1 1/2 pounds of toxaphene per acre. Follow label precautions. 



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. 



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

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

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

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



