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Biological control of the walnut aphid in California; the interrelationship of the aphid and its parasite



Biological control of the walnut aphid in California; the interrelationship of the aphid and its parasite



Environmental Entomology 2(4): 561-568



Populations of Chromaphis juglandicola (Kalt.) and its natural enemies were assessed weekly in a walnut planting in California during the growing season in 1969 and every four days in 1970. A parasite of the aphid, Trioxys pallidus (Hal.) from Iran, was released and became established in the study area in 1969, but it did not affect the abundance of the aphid during that season. Large numbers of mummies overwintered, and the normal peak in aphid numbers in the spring of 1970 did not occur.

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Accession: 000029823

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