Biology of Anaphes ovijentatus (Hymenoptera: Mymaridae) and Its Host, Lygus hesperus (Hemiptera: Miridae), at Low and High Temperatures1

Publisher Website
Google Scholar
Abstract
The mymarid wasp, Anaphes ovijentatus (Crosby and Leonard), developed from egg to adult in Lygus hesperus Knight eggs at a constant temperature of 12.8°C and at variable regimes based on conditions in January, February, and June with means of 10.6 (range, 3.3-19.4), 12.8 (range, 5.6-22.2), and 32.8°C(range, 23.3-45.0°C), respectively. The 32.8°C regime was based on an especially hot week in June. An average of 26 progeny per female was produced at the variable 12.8 and 10.6°C regimes and only a few progeny were produced at a constant 12.8°C. The wasps died in 24 h and produced no progeny at the variable 32.8°C regime. L. hesperus eggs hatched at all four temperature regimes, but nymphs survived to adulthood only at the variable regimes of 12.8 and 10.6°C. Total egg-to-egg periods at the variable 12.8°C regime were approximately 103 d for L. hesperus and 54 d for A. ovijentatus. At constant temperatures, thermal requirements averaged 210.6, 128.8, and 252.9 degree-d for development of A. ovijentatus from egg to adult, and for L. hesperus eggs and nymphs, respectively. These results demonstrate the adaptation of the parasite and its host for development and reproduction under conditions in January and February. The extreme summer conditions were more detrimental to A. ovijentatus adults and L. hesperus nymphs than to L. hesperus eggs or the immature stages of the wasp.

This publication has 10 references indexed in Scilit: