-o- 



imy sawflies are being found in wheat fields, but they are of little concern. Do not con- 



ise sawflies with armyworms . The sawf ly larva is transparent and is yellow to green in 



clor. It also has six or more pairs of abdominal prolegs, while the armyworm has five 

 firs. 



IMEOWNER INSECTS 



t rope an pine sawflies , a third to a half grown, have been reported at work defoliating 

 jne trees. These black-headed, grayish-green larvae like to feed together in clusters. 

 Tey can be controlled by spraying with carbaryl (Sevin) using two tablespoons of the 50- 

 jrcent wettable powder per gallon of water, or 2 pounds per 100 gallons of water. 



WEEDS 

 1STEMERGENCE HERBICIDES FOR CORN 



\ 4-D is the most -economical and effective treatment for most broadleaved weeds in corn. 

 Vu can spray over the top until the corn is 8 inches high. On taller corn, use drop 

 i zzles (extensions) to keep 2, 4-D out of the corn whorl. 



] sure to apply no more than recommended rate of 2, 4-D. That rate varies with the 

 simulation and the strength of formulation (the number of pounds per gallon) . 



Iters are more effective than amines on weeds, so the rates vary. The volatile drift 

 lizard is greater with esters than with amines. 



ftme corn hybrids are more susceptible to 2, 4-D injury than others. Some single-crosses 

 :;em to be extremely susceptible. Inbred seed stock (parent lines) often are quite 

 (Lsily injured. It may be wise to check before spraying. 



hch year some corn is damaged by 2,4-D--1968 was a particularly bad year. Corn is most 

 iisceptible to 2, 4-D injury when it is growing fast or when it is under stress. Spraying 

 orn with 2, 4-D during or immediately after very cool, wet weather (or during very hot, 

 lurid weather) may increase the possibility of corn injury. 



l invel (dicamba) is less likely to injure corn than 2, 4-D, but is much more likely to drift 

 ad injure nearby soybeans, vegetables, or ornamentals. Banvel controls smartweed better 

 'ian 2, 4-D, but is more expensive. 



ntrex (atrazine) can be applied to corn as a postemergence spray until weeds are 1-1/2 

 itches tall. Broadleaved weeds are much more susceptible to AAtrex than annual grass 

 [jeds. So for effective grass control, the timing is critical. 



I)ray additives, such as emulsifiable oils or special surfactants, have increased the post- 

 uergence herbicidal activity of AAtrex. The spray oil should be low in aromatic content, 

 live a high UR value, and should contain at least 1-percent suitable emulsifier--so the 

 Ll and water will mix. Agitation is essential to prevent separation of the oil and water. 



se 2-1/2 pounds of AAtrex SOW and 1 gallon of oil in 20 to 40 gallons of water per acre. 

 |! sure to add the oil last in the mixing operation. Oil contaminated with water before 

 ixing can cause compatibility problems. 



fecial surfactants, such as Tronic or T-Mulz, have also been used with AAtrex. They are 

 Ud at a rate of 1 pint per acre or 1 pint per 25 gallons of spray. Surfactants have the 

 .'Vantage of having less volume to handle, but oils are usually slightly more effective. 



