Effects of temperature on the development, fecundity, and life table parameters of Riptortus pedestris (Hemiptera: Alydidae)
2019
Ahn, Jeong Joon | Choi, Kyung San | Koh, Sangwook
Riptortus pedestris (Fabricius) (Hemiptera: Alydidae) is an economically important insect pest of soybean. We investigated the developmental periods of each life stage as well as adult longevity and female fecundity. The study was conducted at eleven constant temperatures (12.0, 14.0, 15.9, 17.3, 19.3, 23.6, 28.3, 31.2, 34.2, 35.1, and 36.1 °C) for temperature-dependent development, and six constant temperatures (15.8, 19.7, 24.0, 27.8, 32.6, and 35.5 °C) for adult longevity and oviposition. Riptortus pedestris females showed successful egg-to-adult development from 17.9 to 36.1 °C, but failed to complete development under 15.9 °C. Using linear regression, lower developmental threshold (LDT) and thermal constant (K) for the total immature stage were estimated as 14.1 °C and 336.7°-day (DD), respectively. Higher and lower temperature threshold (TH and TL, respectively) were calculated using Lobry–Rosso–Flandrois (LRF) and Sharpe–Schoolfield–Ikemoto (SSI) models; a wider TL-to-TH temperature range (31.4 °C) was observed for LRF than for SSI (18.6 °C). The adult emergence frequency over the full range of constant temperatures was simulated using nonlinear developmental rate functions and the Weibull function. The daily egg production was predicted with respect to temperature and adult age. Biological characteristics of R. pedestris from different local populations are discussed.
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