^alls on trees, especially maple and oak, are caused by tiny insects that have hatched from 

 :ggs layed in the leaves. These tiny insects burrow into the newly developing leaves. The 

 >lant then grows the galls around the insect. 



Spraying with malathion at or immediately after new leaves develop will help control these 

 >ests. However, these galls rarely, if ever, kill the tree. 



NEEDS 

 IERBICIDES AND SEED CORN PRODUCTION FIELDS 



wo big problems in seed production fields have been late -season weed control and inbred 

 .ines susceptible to herbicidal injury. Herbicides with close crop tolerance may injure 

 iome inbred corn lines, causing a failure of male- and female-parent lines to "nick." 



Several herbicide labels caution about use on inbred lines of corn or in seed production 

 : ields. Eptam, Randox-T, and Dowpon have not been recommended for seed production fields 

 .n the past. Currently, Primaze and Sutan are not suggested for this purpose. Primaze is 

 l combination of atrazine and prometryne, and prometryne has some potential for corn in- 

 ury. 



lany seed producers have had a problem with late-season grass control. Sutan has shown the 

 ibility to control some of these grasses such as fall panicum, witchgrass, and crabgrass. 

 lany inbred corn lines were evaluated in 1968 for their susceptibility; most lines showed 

 ;ood tolerance. However, a few lines were initially injured, but did recover. 



jeed producers and custom applicators should be cautious about using herbicides with close 

 :rop tolerance on seed production fields. If such a herbicide is used, care must be taken 

 r ith calibration, formulation, and application. 



REVISION OF JOHNSONGRASS CONTROL 



he spring treatment program for Johnsongrass control has been changed to shorten the time 

 •etween application and planting of corn and soybeans. Current label directions are: 



. Allow Johnsongrass to grow until 8 to 12 inches tall. 



. Apply 5 to 7 pounds of Dowpon per acre as a foliar spray. 



Wait 3 days after spraying, then plow. 



. Wait at least 5 days after plowing to plant corn or soybeans. If dry weather persists, 

 wait at least 5 days after receiving a minimum of a half an inch of rainfall. 



his clearance shortens the time between spraying and planting by 2 to 4 weeks. The delay 



etween spraying and plowing allows absorption and translocation of Dowpon into the Johnson- 



rass. The waiting period between plowing and planting allows breakdown of the Dowpon so 

 hat it won't injure the corn or soybean crop. 



his change makes the spring program more flexible and allows earlier planting than was 

 reviously possible. The major concern is the possibility of crop injury if planting is 

 oo soon after plowing. The most- effective control program for established Johnsongrass 

 s still the summer program after small grains. 



