Feeding habits of the larch sawfly larvae, Pristiphora erichsonii (Hymenoptera: Tenthredinidae) on Japanese larch in Maryland

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 foli...

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Bibliographic Details
Published in:Chesapeake science 1970-09, Vol.11 (3), p.183-190
Main Authors: Harman, D.M, Brown, M.L
Format: Article
Language:English
Subjects:
Branches
Frass
Insect larvae
Instars
Larix kaempferi
Larvae
Larval development
Leaves
Mortality
Resins
Sawflies
Tenthredinidae
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Summary: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.
ISSN:0009-3262
2168-8060
DOI:10.2307/1351241