Germination of Grain Sorghum and Sudan Grass Seeds After Fumigation with Methyl Bromide and Hydrocyanic Acid¹

Authors: STRONG, R. G.; LINDGREN, D. L.

Source: Journal of Economic Entomology, Volume 56, Number 2, April 1963 , pp. 144-149(6)

Publisher: Entomological Society of America

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Abstract:

Seeds of three varieties of grain sorghum with a graded moisture range of 9%, 11 % 13% and 15%, and of one variety of Sudan grass with a graded moisture range of 8%, 10%, 12% and 14% were fumigated with methyl bromide and hydrocyanic acid in 100-cubie-foot gas-tight chambers. Exposure periods, dosages of fumigant applied, and temperatures during fumigation were varied. One-half of the fumigated samples of seeds received one fumigation; the others were fumigated twice.

Under the conditions of these studies, germination of grain sorghum and Sudan grass was not seriously impaired by hydrocyanic acid when seeds were thoroughly aerated before planting. Injury resulting from methyl bromide fumigations could be identified as retarded emergence and growth of roots and shoots in various degrees, ranging up to complete absence of germination in some seeds.

Dosages of fumigant applied, temperatures during fumigation. period of exposure, and moisture content of seeds were variables found to be most important in contributing to injury of seeds by methyl bromide. Two fumigations resulted in lower percentages of germination than one fumigation

Differences in the response to methyl bromide among the three varieties of grain sorghums were attributed to quality of seeds used rather than to varietal differences in susceptibility to the fumigant. Sudan grass seeds were considerably less susceptible to injury during fumigation than seeds of the grain sorghums.

Document Type: Research article

Publication date: 1963-04-01

More about this publication?

Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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