-4- 



VOLUNTEER SUNFLOWER CONTROL 



We are receiving several calls about controlling volunteer sunflowers in corn and soy- 

 beans. Shattering, caused by delayed sunflower harvest last fall, plus minimum till- 

 age operations this spring have created the volunteer sunflower problem. 



Use AAtrex or 2,4-D to control volunteer sunflowers in corn. The AAtrex can be applied 

 preplant, preemergence , or postemergence. Apply the 2,4-D postemergence. Follow the 

 usual precautions on rate, size of corn, and timing. 



Volunteer Sunflowers in Soybeans . These can be a real problem because the two most 

 common soybean herbicides , Amiben and Treflan, are also cleared for use when produc- 

 ing sunflowers. Chloroxuron, which is sold as Tenoran or Norex, will give fair con- 

 trol if used when the sunflowers are small. Again, observe the usual precautions for 

 additives, rates, and timing. Soybeans will often show a temporary yellowing after an 

 application of chloroxuron. Basagran (bentazon) , a new experimental herbicide for 

 postemergence use in soybeans, maypprovide some control, but supplies are limited. 



SOYBEAN WEED CONTROL 



Preemergence Herbicides . Most such herbicides for soybeans should NOT be applied to 

 soybeans that have emerged. "Browning" and serious soybean injury may result. Chlor- 

 bromuron (Maloran or Bromex) , Lorox, and Sencor are photosynthetic inhibitors that 

 may cause severe contact burn to exposed cotyledons and foliage. Solo and fluorodi- 

 fen (Preforan or Soyex) applied early postemergence may also cause burning and a twist- 

 ing of the soybeans. 



"Preemergence" means before the crop and weeds have emerged from the soil. So apply 

 preemergence herbicides at the proper time. If you get too far ahead in your plant- 

 ing, you may find that you are behind in your weed control program. 



Weed Control in Flooded Areas . We have received several calls on how to control weeds 

 in flooded areas where farmers hope to plant soybeans. Paraquat is the only herbicide 

 cleared for vegetation control prior to planting soybeans. Paraquat is a contact her- 

 bicide. Be sure to use an adequate volume of water and to add a surfactant in order 

 to obtain complete foliar coverage. The proper rate is 1/2 pint of Paraquat in 40 to 

 60 gallons of water. 



PASTURE WEED CONTROL 



If you have your other jobs done this spring, it is time to spray pasture weeds such 

 as ragweed, hemp, goldenrod, fleabane, and ironweed. Use the low-volatile ester of 

 2,4-D at 1 to 1-1/2 pounds per acre (1 to 1-1/2 quarts of 4 -pounds -per -gal Ion formu- 

 lation) in at least 15 to 20 gallons of water per acre. Take proper precautions to 

 prevent drift onto desirable vegetation (trees, shrubs, gardens). Observe the seven- 

 day grazing restriction for dairy animals . 



PLANT DISEASES 



CORN DISEASES 



Stewart's Wilt and Leaf_Blight of Corn . Several sweet corn samples showing extensive 

 flea -beetle feeding, but no traces of Stewart's disease, have been received at the 

 Plant Disease Clinic in Urbana. Leaf blight symptoms- -long, narrow, yellowish-tan 



