Abstract
Glasshouse experiments were conducted to determine the phytotoxic effect of triallate [S-(2,3,3-trichloroallyl)-diisopropylthiocarbamate] granules on oat (Avena sativaL. ‘Kelsey’). The sphere-of-influence of the granules was found to diminish rapidly with increase in the horizontal distance from the tips of the caryopses. At a distance of 10 mm from the caryopsis tip there was no significant effect on the growth of the oat seedling. The need for the granules to be in close proximity to the developing coleoptile could not be counteracted by increasing the number of granules per caryopsis once the granules were 10 mm or more from the caryopsis. These results give cause to seriously question the generally held belief that triallate disperses through the soil in a volatile phase. Extension of the first leaf and mesocotyl was inhibited much more readily by triallate than coleoptile extension, which was stimulated by a number of treatments. When granules were left on the soil surface of sub-irrigated pots the phytotoxic effect seemed to be mediated through triallate-exposure of the coleoptile tip.
Publisher
Cambridge University Press (CUP)
Subject
Plant Science,Agronomy and Crop Science
Reference3 articles.
1. McKercher R.B. , Ashford R. , and Morgan R.E. 1975. Effects of triallate on wild oat grown in a growth chamber. Weed Sci. 23. (In press).
2. Erbach, D.C. 1974. Investigations of herbicide granule distribution. Ph.D. thesis. Iowa State University, Ames, IA. 153 pp.
3. Holroyd J. 1968. Triallate granules for the postemergence control of Avena fatua in winter and spring cereals. Proc. 9th Brit. Weed Contr. Conf. 68–73.
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