Mass-culturing Chrysopa californica to Obtain Eggs for Field Distribution

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Abstract
Spores of Nosema destructor have been eradicated from the stock of Gnorimoschema operculella and spores of Plistophora californica have been killed by using hot-water treatments. Egg production has been greatly amplified through the use of a certain protein hydrolysate of yeast in the diet of adult Chrvsopa. The yield of Chrysopa cocoons, per culture unit, has been increased by a better timing of food-introduction. The activity of adult Chrvsopa has been controlled by exposing them to continuous artificial light only. A method was developed whereby the stalks of Chrvsopa eggs may be dissolved in a bath of sodium hy-pochlorite, the freed eggs collected, dried, and measured volu-metrically in units for field distr. Equipment was designed to facilitate the handling of material in large quantities.

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