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Effect of Methyl Bromide Fumigation on Germination of Longleaf, Slash, and Loblolly Pine Seed

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Germination tests were conducted on longleaf, slash, and loblolly pine seed after fumigation with methyl bromide and after storage for 1 year. Normal fumigation dosage for imported conifer seed is 2½ pounds of methyl bromide per 1,000 cubic feet for 2½ hours at normal air pressure at a temperature range of 80° to 96° F. These species were fumigated experimentally with methyl bromide at half-normal, normal, and twice normal dosage. A non-fumigated control lot was used for comparison with lots treated. One other lot was also fumigated at normal dosage using a 26-inch vacuum. Each species of seed was divided into three lots and adjusted to moisture contents of 5, 10, and 15 percent. Longleaf pine seed were damaged by fumigation only at high moisture contents. Slash and loblolly pine seed were damaged when fumigated at normal dosage or above at the 15 percent moisture content level. Seed moisture content appeared to be more critical than the amount of fumigant used. There were significant interactions, however, between fumigation dosage and seed moisture content levels. Seed of longleaf should be held at 5 percent moisture content, or less, when fumigated. The moisture content of slash and loblolly should be 10 percent or lower for fumigation. After 1 year of storage at 20° F, loss in germination was caused by a high moisture content rather than fumigation dosage.
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Document Type: Journal Article

Affiliations: In Charge, Plant Inspection Station, Plant Quarantine Division, Agric. Research Service, U. S. Dept. Agric., Washington, D. C.

Publication date: 1964-10-01

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