Abstract
Amynothrips andersoni O'Neill, a natural enemy of alligatorweed, was studied in its indigenous environment in South America and under laboratory conditions in California. Five stages occur, including a prepupal period and a pupa characterized by early and late changes. Development required 28 days (egg to egg) in the laboratory. Amynothrips andersoni is multivoltine, producing an estimated 4—5 generations annually in Argentina. Production of males only by unfertilized females indicates that this thrip reproduces by arrhenotoky (facultative parthenogenesis). The geographic distribution, life history, seasonal occurrence, population dynamics, developmental behavior, and ecological relationships of A. andersoni are discussed.
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