| Effect of short-term heat Stress on demographic parameters of the Diamondback moth, Plutella xylostella (L.) (Lepidoptera: Plutellidae) larva |
| Paper ID : 1237-3IICE (R1) |
| Authors: |
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Najmeh Ebrahimi ebrahimi *1, najmeh Ebrahimi2, Ali Asghar Talebi3, Yaghoub Fathipour4 1Department of Agricultural Entomology, Iranian Research Institute of Plant Protection, Tehran, Iran 2Iranian research Institute of Plant protection 3Agricultural Entomology, Tarbiat Modares University, Tehran, Iran 4Tarbiat Modares University |
| Abstract: |
| The diamondback moth (DBM), Plutella xylostella (L.) (Lepidoptera: Plutellidae) is a serious and economically important pest of cruciferous crops in the world. Temperature and relative humidity are among the most important abiotic factors affecting the biology of DBM. Some researchers have shown that extreme temperature and humidity conditions are environmental stresses that can result in DBM death if they persist. In this research, the effect of short-term heat stress on larval stage was studied on demographic parameters of P. xylostella at laboratory condition. Diamondback moth larvae were exposed to 30, 35 and 40 °C for duration of 2, 4, 6 and 8 h and then returned to normal temperature condition (25°C). The larvae maintained at 25°C were used as control. Daily fertility with together preimaginal development time and mortality were analyzed according to Jackknife method and with SPSS and MINITAB statistical software. The results showed that P. xylostella larva were successfully developed to adulthood at short-term (2, 4, 6 and 8h) heat stresses. The highest and lowest net reproduction rate (R0) was obtained at 30°C (61.68±4.08 female/female/generation) for 8 h and (17.76±2.57 female/female/generation) for 6 h, respectively. The generation time (T) was longest at 40°C for 2 h (18.40±0.33 days). The intrinsic rate of increase (r) ranged from 0.16±0.007 day-1 at 30°C for 6h to 0.25±0.005 day-1 at 30°C for 8 h with significant difference, The results showed that the climate change and high temperature play an important role in changes in the biological characteristics of DBM, however, the pest adapted to environmental changes and maintained its optimum fitness. |
| Keywords: |
| Plutella xylostella, Diamondback moth, Heat stress, Demography |
| Status : Paper Accepted (Poster Presentation) |
