Observations on the biology of Cinara ponderosae (Williams) (Homoptera: Aphididae) in the westside forests of the Sierra Nevada

D. J. Voegtlin and D. L. Dahlsten

Hilgardia, 1982, vol. 50, issue 5

Abstract: The species is believed to be anholocyclic, because sexuales, eggs, and fundatrices were absent. In the spring following winter survival on ponderosa pine (Pinus ponderosa Lawson) in the foothills, populations migrated up the west slope of the Sierra Nevada. The local population in Blodgett Forest, Eldorado County, began in May with the number of aphids and colonies expanding throughout June and collapsing by the end of July. Detailed study of instar distribution, based on a sampling every four days, showed a gradual increase in older instars until population collapse. First generation 4th instars and apt era e moved throughout the tree and began new colonies.

Keywords: Environmental; Economics; and; Policy (search for similar items in EconPapers)
Date: 1982
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