-2- 



methoxychlor per acre; or (4) 1-1/4 pounds of malathion per acre on days when 

 air temperatures will be above 60° F. for several hours after application. 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. 



5. Using ground equipment . Apply a minimum of 20 gallons of finished spray per acre, 

 or 4 gallons by air. 



Clover leaf weevils. These can be found in an occasional red clover field, but pop- 

 ulations thus far are not very high. The larvae are green with a white stripe down 

 the back. They feed at night and hide under the ground debris during the day. Dam- 

 aged clover will have irregular holes in the leaves from their feeding, but will 

 usually recover. Severe damage could occur in some fields if the cool weather con- 

 tinues. 



Check red clover fields that have a heavy straw or mat covering. If plant growth 

 is slow and leaf feeding becomes severe, a spray of 1 pound of malathion per acre 

 (or mixtures of malathion or diazinon with methoxychlor) will control this insect. 

 For best results, apply malathion when air temperatures are 60° F. or above. 



SOIL INSECTS 



We continue to receive questions about the cancellation of the aldrin label by the 

 Federal Environmental Protection Agency. Although we do not recommend the use of 

 aldrin or heptachlor in Illinois, it is still legal to use and sell aldrin for corn- 

 soil application . 



A challenge has been issued to the manufacturing company to show evidence that the 

 sale and use of aldrin is still justified, and that continued use will be of greater 

 benefit to the consuming public than the hazard to the environment. For this year, 

 using and selling aldrin is legal. This will continue to be the case until a fur- 

 ther ruling is made after the conclusion of adequate hearings. That will not occur 

 until after the 1971 season, perhaps even after the 1972 season. 



In most instances, we feel that aldrin and heptachlor will not be profitable, par- 

 ticularly on fields with a history of use. In many of these cases, diazinon seed 

 treatment may be sufficient. If you do use aldrin or heptachlor, use them only on 

 corn planted on sod fields. Do not use aldrin or heptachlor on dairy farms or where 

 soybeans are to be grown during the year of treatment. Do not grow soybeans in fields 

 where aldrin or heptachlor have been applied for five or more consecutive years. If 

 you use aldrin or heptachlor on corn and lose the stand too late for replanting to 

 corn, do not plant soybeans in that field. Dasanit, diazinon, Dyfonate, and phorate 

 (Thimet) have been steadily replacing aldrin and heptachlor in general-use situations 

 for corn-soil application. Along with carbofuran (Furadan) and BUX, they nave almost 

 completely replaced aldrin and heptachlor for rootworm control. 



CORN INSECTS 



European corn borers . Tie survival of overwintering borers is lav in the southern 

 and western areas of Illinois where there was little or no snow cover during the 

 winter. Survival is higher in northern Illinois wherever the snow cover was more 

 extensive. Although the overall survival is apparently lower than last year, this 

 does not eliminate the corn borer as a potential problem. Reports on com borer 

 survival from Extension advisers were received from El don Starkweather in Greene 

 County and Bob S clime rbauch in Wayne County. 



