Feeding of Overwintered Tobacco Flea Beetles and First Brood Emergence Following Soil Treatment with Insecticides

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Abstract
Injury by the tobacco flea beetle, Epitrix hirtipennis (Melsh.), is most noticeable on the foliage, but the larvae feed on the roots and may severely damage newly set tobacco. Investigations were carried out during 1956-58, inclusive. to determine the effects of applying aldrin, chlordane, and heptachlor as a soil treatment on the feeding of the overwintered beetles and the emergence of the first brood adults. A soil treatment with aldrin, chlordane, or heptachlor was less effective in preventing foliage damage to newly set tobacco than the standard DDT foliage spray applied in the plant bed before the plants were pulled. In the tests, the three insecticides gave similar results and no significant difference occurred in the aldrin or heptachlor treatments at 3 and 6 pounds per acre. Aldrin, chlordane, and heptachlor were highly effective in preventing the emergence of the first brood adults on either an eroded Cecil loam or a Cecil sandy soil type. In the untreated plots a larger number of beetles emerged from caged plants on the eroded Cecil loam than from those on the Cecil sandy loam soil.

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