Feeding Habits of the Larch Sawfly Larvae, Pristiphora erichsonii (Hymenoptera: Tenthredinidae) on Japanese Larch in Maryland

1 September 1970

journal article
Published by Springer Nature in Chesapeake Science

Vol. 11 (3) , 183-190
https://doi.org/10.2307/1351241

Abstract

Studies on the feeding habits of larch sawfly larvae,Pristiphora erichsonii (Hartig), in Maryland, substantiated previous reports of a feeding preference for spur foliage over elongated shoot foliage. In field examinations on 20 infested Japanese larch trees, significantly greater quantities of foliage were consumed from spurs than from elongated shoots. However, elongated shoots constituted about 1/4 of the total foliage weight consumed. Larvae reared in the laboratory on a constant diet of elongated shoots were more restless, consumed less foliage, and incurred higher mortality than larvae reared on spur foliage. In chemical comparisons, spurs tested quantitatively higher in carbohydrates, proteins, resin, pitch, tar, and photosynthetic pigments than elongated shoots.

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