-2- 



If after careful examination you decide to treat with an insecticide, l-l/2 

 lb. of Sevin per acre, or l/8 to l/k lb. of dieldrin, or 1-1/2 lb. of toxaphene will 

 kill the worms. But absolutely do not use dieldrin or toxaphene on ensilage corn. 

 Use Sevin in these cases. If there is any possibility of drift of either dieldrin or 

 toxaphene onto dairy hay or pasture, use Sevin. 



If you apply dieldrin to corn for grain, do not harvest for 60 days. There 

 is no time li mi t between toxaphene application and corn grain harvest. There is no 

 time limit between application and forage harvest when using Sevin. 



Pupation of first -generation corn borers is well under way, and moth emer- 

 gence and egg-laying for a second generation have started. We also found some eggs 

 hatching this week. Although this early egg-laying is of little importance to the 

 field corn grower, it is important to the commercial grower of sweet corn. Canners, 

 particularly in central and north-central Illinois, should begin a control program now. 

 Protect corn that is 10 days or more from harvest to avoid any possibility of worm 

 contamination of the final product. 



Grasshoppers are concentrated in some spots in fence rows and similar areas. 

 Sevin, malathion, diazinon, toxaphene, or dieldrin applied to these concentrations of 

 hoppers will control them. However, read the label to determine whether the insecti- 

 cide can be used on a particular crop and the interval required between application 

 and harvest. 



Northern corn rootworm adults have been emerging for the past two weeks. 

 These green beetles concentrate on the fresh silks. But unless there are many on each 

 silk and they are cutting pollinating silks severely, control of adults is not profit- 

 able. 



Caution : Before applying insecticides, read the labels carefully and follow 

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

 insecticide residue hazards. 



For a list of general precautions to use when handling and applying pesti- 

 cides, write to 280 Natural Resources Building, University of Illinois, Urbana, Illi- 

 nois, for "Safe Use of Pesticides." 



This weekly report was prepared by H. B. Petty, Steve Moore, and C. E. White, 

 Illinois Agricultural Extension Service and Illinois Natural History Survey, in coop- 

 eration with the USBA Agricultural Research Service, Plant Pest Control Branch, from 

 information gathered by entomologists and cooperators who send in weekly reports from 

 their own localities. 



NOT FOR PUBLICATION - Special Note to Farm Advisers : 



A news release from Wisconsin this week reported that five dairy farmers 

 were "off the market" because of DDT contamination of milk produced on their farms. 

 In three cases the cattle were fed DDT-contaminated ensilage made from last year's 

 sweet corn. The other two cases are still under investigation, but DDT-contaminated 

 fly spray is being checked as a possibility. 



Most Illinois canners have been and are using Sevin. This use is legal and 

 the ensilage can be fed. Many vegetable growers use DDT, but then the ensilage and 

 fodder can not be used. You, as well as your dairymen, should be aware of the possi- 

 bility of contamination of sweet corn fodder and ensilage and guard against it. 



