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Additional info for Crop Safeners for Herbicides: Development, Uses, and Mechanisms of Action
The most important of them are listed in Table V. The comparative solubility and biodegradability of a safener and a herbicide packaged together in a mixture are of particular importance (Prochnow, 1978). If the safener is more soluble than the herbicide then leaching of the safener from Table V Characteristics of Prepackaged Herbicide/Safener Tank Mixtures Safener should remain in the protection zone for as long as the crop is susceptible to the herbicide Safener should not be more water-soluble than the herbicide Safener should not be more biodegradable than the herbicide Safener should not interfere with the effectiveness of the herbicide on target weeds Safener should be compatible with other pesticides that may be added to the spray tank or applied to the soil when the herbicide/safener mixture is present 1.
On the negative side, problems that may be encountered with prepackaged herbicide/safener formulations include the potential shifting of weed populations toward species tolerant to this formulation following repeated applications of the mixture and the reduced selectivity of these formulations under certain environ mental conditions (Stephenson and Ezra, 1983). C. Seed Safeners The seed represents a critical stage in the life cycle of all plants. Unsown seeds of crops are separated from weeds and their dressing with safeners provides the ultimate in safener selectivity (Hoffman, 1962, 1978).
Crook, J. J. (1975). A status report of thiocarbamate injury to corn on the Maryland eastern shore. Proc. Annu. Meet. Northeast. Weed Sei. Conf. 29, 49-54. Dale, J. E. (1979). Application equipment for Roundup: The ropewick applicator. Proc. Beltwide Cotton Prod. Res. -Cotton Weed Sei. Res. Conf. 3, 138-141. Davidson, W. , Gagnon, S. , Chrustensen, M. , and Dorr, J. E. (1978). A new herbicide safener which permits effective grass control in sorghum. Proc. West. Soc. Weed Sei. 31, 123-129. Devlin, R.