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Some observations on winter moth caterpillar attack on fruit trees in 1929-30

Some observations on winter moth caterpillar attack on fruit trees in 1929-30

Jour So Eastern Agric Coll Wye Kent 28: 137-146

Cheimatobia brumata emerged from about Oct. 24 to Jan. 30. Hybernia defoliaria emerged over almost exactly the same period, but in very much smaller numbers. Over 99% of the [female][female] taken were C. brumata. H. defoliaria accounted for most of the others; the March Moth, Anisopteryx aescularia, was not recorded. An occasional [female] of Phigalia pilosaria was taken. The eggs of C. brumata, when laid on unbanded trees, were mostly on the smaller^ wood and fruit spurs; about i were superficial and not in any way concealed, -i completely concealed (beneath bud-scales, dead bark, etc.). Many eggs may be laid on stakes, etc., supporting the trees. Even the most careful attention to greasebands did not entirely prevent attack, although the banded trees were as free from caterpillar damage as the best of the sprayed trees. Under commercial conditions, and especially if large numbers of moths are emerging, grease-bands do not prevent considerable numbers of [female][female] from ascending. There is considerable evidence to disprove the theory that [female][female] may be carried up by the [male][male], in copula. A tar oil wash of the Long Ashton type gave no better or scarcely as good control of Winter Moth caterpillars as an old type Tar Oil wash used at the same strength (10%). At 6% the control from the Long Ashton type wash was not sufficient to be of commercial value, and had to be followed by lead arsenate. Concealed eggs do not seem to hatch in any greater proportions than eggs laid superficially, when the trees on which they occur have all been subjected to the same treatment.

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