Biology of the Weevil Cylindrocopturus eatoni Buchanan, Injurious to Ponderosa and Jeffrey Pine Reproduction

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Abstract
C. eatoni is a newly described sp. recorded from central and n.-e. California, where it has recently been found to be injurious to brushfield plantings of ponderosa and Jeffrey pines. Injury is caused chiefly by the mining of the larvae within the cortical region of the hosts, which results in the death of the tree. Minor damage is caused by the feeding of adults on pine needles. The insect has a 1-yr. life cycle. Winter is passed in the larval stage, pupation occurs in the spring, and the adults emerge in June. The [female][female] deposit their eggs in the stems and twigs of small trees early in July. Larval development from the egg and subsequent feeding within the cortical area are accompanied by the death of the tree. By the time the tree is completely brown the larvae are mature. Conc. sprays of Pb arsenate and cryolite prevented injury to trees exposed to attack.

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