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Effects of Structures of s-Triazines on Toxicity to Soybeans and Weeds

Published online by Cambridge University Press:  12 June 2017

C. G. McWhorter
C. G. McWhorter*
Affiliation:
Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture in cooperation with the Delta Branch, Mississippi Agricultural Experiment Station, Stoneville, Mississippi
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Abstract

Greenhouse evaluation of 30 s-triazine compounds indicated that several of them were suitable for pre-emergence weed control in Lee soybeans. The s-triazines least toxic to soybeans generally contained either methoxy or methylmercapto substituents but most of these were highly toxic to crabgrass (Digitaria sanguinalis (L.) Scop.). Soybeans were more tolerant to ethylamino substituted s-triazines than to isopropylamino derivatives. Chloro derivatives were generally toxic to soybeans. Proplyamino, allylamino, methoxypropylamino, ethoxy, trichloromethyl, and amido substitutions had much less effect on soybean selectivity than those previously mentioned.

Field evaluation of several s-triazines, preemergence, confirmed the tolerance of soybeans to 2,4-bis(isopropylamino)-6-methylmercapto-s-triazine (prometryne), 2-ethylamino-4-isopropylamino-6-methylmercapto-s-triazine (ametryne), and 2-isopropylamino-4-methylamino-6-methylmercapto-s-triazine (norametryne) at rates that provided adequate weed control.

Type
Research Article
Information
Weeds , Volume 11 , Issue 4 , October 1963 , pp. 279 - 283
Copyright
Copyright © 1963 Weed Science Society of America 

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References

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