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Determination of larval instars of the white-pine weevil by head-capsule measurements
Harman, D.M. (1970). Determination of larval instars of the white-pine weevil by head-capsule measurements. An. Entomol. Soc. Am. 63(6): 1573-1575
In: Annals of the Entomological Society of America. Entomological Society of America: College Park, Md.. ISSN 0013-8746, more
Peer reviewed article  

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Keyword
    Pissodes strobi

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  • Harman, D.M.

Abstract
    Larval instars of Pissodes strobi (Peck) were differentiated by means of head-capsule measurements in laboratory studies conducted during 1967-69 and involving more than 300 weevil larvae. In a statistical comparison of these data with Finnegan's data (Canadian Entomologist (90)6 : 348-54, 1958) on the closely related P. approximates, the larvae of P. strobi were significantly smaller in each instar. A 5th instar, not previously reported for P. strobi, was recorded in 40% of the larvae which survived the 4th stage in the 1969 study. Male and female larvae entered the 5th stage in similar percentages. No significant differences in head-capsule width were noted between male and female larvae.

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