Biological Control Measures Applied Against Pseudococcus maritimus on Pears

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Abstract
The dominant enemy of P. maritimus in California is the predator, Chrvsopa californica Chrvsopa eggs were artificially supplied to sprayed orchards to offset a deficiency of naturally oviposited eggs. The timing of these egg colonizations was found to be very important and a small colonization of 250 eggs per tree made at the proper time and repeated at 2 successive periods gave the most effective results. Such repeated colonizations were better than a larger total number of eggs applied in a single colonization.

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