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Studies on the Sex Ratio of the Gypsy Moth

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The sex ratio among gypsy moth (Porthetria dispar (L.) embryos and newly hatched larvae approximated 50:50. By the time the insects reached instar II, however, the sex ratio had changed so that there were more female than male insects in the population. The sex ratio among both instar III and instar IV larvae continued to be distorted in favor of the females, and averaged about 66:34 at the start of instar IV. These findings complete the quantitative basis required for the explicit analysis of the female component of gypsy moth populations.

Document Type: Journal Article

Affiliations: Entomologist on the Staff of the Forest Insect and Disease Laboratory, of the Northeastern Forest Expt. Sta., Forest Service, U. S. Dept. of Agriculture, West Haven, Conn.

Publication date: March 1, 1967

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