Zorn leaf aphids are present in small numbers, but chemical control will probably not 

 )e necessary as we have not seen many on late corn. Maximum aphid reproduction and 

 survival occurs between late- whorl and dry- silk stage. After this stage, aphid num- 

 bers decline rapidly. 



therefore most of our corn is beyond the stage when it would be damaged severely. If 

 :ontrol becomes necessary, malathion sprays are effective. 



]orn rootworm beetles are more numerous this week than last. Control is recommended 

 If a field is less than 50 percent pollinated and there are 5 or more beetles per 

 Dlant. To control, apply 1 pound of carbaryl (Sevin) , malathion, or diazinon per 

 icre. Do not harvest for 10 days when using diazinon, or 7 days for malathion. Since 

 ;hese beetles are killed easily, other insecticides may be effective. 



\rmyworms sometimes appear in cornfields in northern Illinois at this time of year. 

 ]heck weedy or grassy spots for signs of armyworm infestations. If needed, toxa- 

 Dhene, carbaryl, or malathion provide control. 



10RGHUM INSECTS 



rem leaf aphids are decreasing in number in most fields although an occasional late 

 "ield still is heavily infested. Fungus diseases are killing many of these aphids 

 lows. Lady beetle adults and larvae are now becoming abundant and are eating aphids. 



rem earworms , fall armyworms , and European corn borers were observed in sorghum this 

 reek but were not of economic importance. 



10MEOWNER INSECTS 



Crickets are now migrating into homes. This is the large black cricket, not the small 

 >rown field cricket that will soon appear in swarms. Foundation sprays of chlordane 

 fill control both. Mix 1/2 pint of 45 -percent chlordane concentrate in three gallons 

 >f water. Spray the outside of the house foundation to the point of run- off . In ad- 

 tition, spray the expansion joints along porches and steps, and along the edges of 

 iidewalks and driveways. In homes with a crawl space, spray the inside wall and any 

 .upporting pillars. Do not spray directly onto shrubbery or flowers. The oil solvent 

 n the spray may burn the tender foliage of some plants. 



WEEDS 



''PA CANCELS AMITROLE REGISTRATION 



>n June 16, 1971, the Environmental Protection Agency (EPA) issued an order canceling 

 registration of amitrole (amino triazole) for use on food-crop lands. This cancella- 

 ion would also apply for amitrole-T. 



specific amitrole registrations that have been canceled are: 



-Application before planting com to control Canada thistle and quackgrass. 



[-Spot treatment in pastures to control Canada thistle. 



-Spot treatment after cutting or post-harvest in alfalfa, clover, grains, legumes, 

 peas, and soybeans to control Canada thistle. 



