Survival of the mosquito predator,Notonecta unifasciata[Hemiptera: Notonectidae] embryos at low thermal gradients |
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Authors: | R. D. Sjogren E. F. Legner |
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Affiliation: | (1) Department of Entomology, University of California, 92521 Riverside, CA;(2) Present address: Metropolitan Mosquito Control District, 2380 Wycliff St., 55114 St. Paul, MN;(3) Present address: University of California, 92521 Riverside, CA |
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Abstract: | Notonecta unifasciata Guerin eggs maintained at different stages of embryonic development in water at variable temperatures (2.2–25.6 °C) and for periods of 4–12 weeks revealed maximum viability (>80 %) at the highest temperature. However, optimum nondevelopmental viability was at 14.4 °C with eight-day-old embryos (>35 %). Short term (4 weeks) storage at 14.4 °C significantly increased egg viability. Survival was poor (<20 %) at the 2 lowest temperatures. Eggs held at 14.4 °C for 12 weeks and sustainingca. 50 % mortality, may be a practical procedure for biological control. |
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Keywords: | Notonecta embryos temperature |
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