There are no restrictions for carbaryl in the waiting period between last application 

 and harvest. There is no limitation for Gardona except on the fodder, for which there 

 is a 5-day waiting period. There is no time limitation for methomyl, but there is a 

 3-day waiting period for the use of the fodder. There is a 12-day waiting period for 

 parathion. 



Field corn does not require protection against corn earworm attack. 



Picnic beetles, also called scavenger beetles , can be found in the tips of corn ears. 

 They usually are attracted to fields where other damage has occurred. Once there, they 

 may accentuate the other damage. Even when they can be found in ear tips, we have not 

 been able to show any extensive yield benefit from insecticide control on field corn. 



Corn leaf aphids continue to appear in colonies in the whorls of corn plants. Most 

 fields of field corn have escaped aphid damage, A few particularly late fields could 

 still develop a problem. If 50 percent or more of the plants are moderately infested 

 and soil moisture is low, apply a spray of malathion or diazinon. This application 

 should be made when the corn is between late -whorl and dry- silk stage. For sweet corn 

 growers, the addition of malathion or parathion to the borer or earworm spray will con- 

 trol these aphids. Time this spray to be applied as the tassels are emerging or slight- 

 ly later. 



SOYBEAN INSECTS 



Bean leaf beetles will soon be appearing. These yellow, green, or red beetles with 

 black spots on their backs are easily disturbed and sometimes hard to find. Their 

 feeding is distinct since they eat holes in the leaves. 



We had numbers of these beetles in some fields in early June. They laid eggs in the 

 soil, and the larvae fed on the nitrifying bacteria nodules. These larvae have now ma- , 

 tured and pupated, and will soon emerge as the beetles to feed on the leaves. 



Ordinarily they feed only on the leaves , but occasionally they will eat the bristles 

 on the pods. 



Damage from leaf -feeding insects is not important if the leaf feeding occurs after pod 

 set and partial fill. Damage can be severe if the leaf feeding occurs between early 

 blossom and pod set and the insects consume over 40 percent of the total leaf surface. 

 tost beans will be beyond this stage by the time beetles emerge. If you have a partic- 

 ularly late field of beans and 25 percent or more of the leaf surface has been devoured, 

 an application of carbaryl or toxaphene may be warranted. Both of these will also con- 

 trol any grasshoppers that may be present. 



LIVESTOCK INSECTS 



Stable flies were observed attacking dairy cattle this week, particularly in central 

 and northern Illinois. Cows were standing in the shade and noticeably fighting flies. 

 Populations of these stable flies have increased rapidly this past two weeks, and face 

 flies and horn flies are adding to the animals' annoyance and discomfort. We repeat 

 recommendations from the June 30 issue. 



For dairy cattle, apply one of the following materials two to four times per week at 

 the rate of 1 to 2 ounces per animal: crotoxyphos (Ciodrin) as (1) a 2-percent oil 

 spray, (2) a 2-percent water-base spray, or (3) a mixture of 1-percent crotoxyphos 



