Author
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WAX, LOYD |
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Submitted to: Illinois Agricultural Pesticides Conference Proceedings
Publication Type: Proceedings Publication Acceptance Date: 1/4/2000 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: Unidentified Foliar Observations in soybean fields continue to appear on a substantial acreage throughout the Corn Belt. These symptoms vary widely by year, location, and environment. The affected plants usually exhibit symptoms typical of those caused by plant growth regulator herbicides used for weed management in corn, and include leaf cupping, strapping, puckering and crinkling, that often appears on the new leaves 2 to 4 weeks after application. Many of the injury situations can be related to drift of vapor or spray particles, or to contamination in tanks and spray equipment previously used for weed management in corn. Contamination from equipment can be magnified by some of the adjuvants used in spray mixtures. Previous research has defined the responses of soybean to various dosages of plant growth regulator herbicides. The problem is made more complex by the potential interaction with other herbicides that might be used in soybean, and by evidence that the symptoms sometimes appear with no history of potential herbicide drift or contamination, raising questions about the potential for hormonal imbalance in the plants not caused by growth regulator herbicides. If these symptoms are indeed occurring in the absence of involvement of growth regulator herbicides, then some combination of genetic differences, herbicide combinations, and unusual environmental conditions are likely involved. We are initiating research to establish techniques to determine whether or not exogenous plant growth regulator herbicides are involved with plants that exhibit these cupping, puckering, and crinkling symptoms. |
