Title: Effect of Temperature on Rate of Development and Survival of Simyra henrici1
Abstract:Eggs of Simyra henrici (Grote) had incubation periods ranging from 20 days at 14.4°C to 3 days at 32.2°C. Developmental velocity was a straight-line relationship. The theoretical threshold of egg deve...Eggs of Simyra henrici (Grote) had incubation periods ranging from 20 days at 14.4°C to 3 days at 32.2°C. Developmental velocity was a straight-line relationship. The theoretical threshold of egg development was about 11.1°C. Larval development was completed in 7 or 8 instars at temperatures from 14.4° to 32.2°C. The theoretical threshold of larval development was 10°C, and the mean degree-day requirement for completion of the larval period was 502.0. The rate of larval development also showed a straight-line relationship at these temperatures. The duration of the larval period ranged from 22.7 days at 32.2°C to 56.7 days at 18.3°C for larvae having 7 instars and from 24.3 to 62.7 at these same temperatures for larvae having 8 instars. The combined prepupal and pupal periods ranged from 11 days at 32.2°C to 42 days at 15.6°C with a degree-day requirement of 248.3°C based on the 10°C threshold temperatures. The entire life cycle of S. henrici ranged from 37.5 days at 32.2°C to 97.2 days at 18.3°C with a mean degree-day requirement of 806.9 over the 10°C threshold. S. henrici overwinter as pupae, and the supercooling points of 11 pupae ranged from -21.1° to -27.8°C. Pupae exposed to natural outdoor conditions had a mean survival rate of 15.5% in 1964-65. The severity of winter greatly influenced the number of S. henrici adults present the following summer.Read More
Publication Year: 1971
Publication Date: 1971-02-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 5
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