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Abstract
The current study investigated the impacts of temperature on the development and reproductivity of the sweet potato leaf folder, Brachmia macroscopa (Lepidoptera: Gelechiidae), in sweet potato leaves under laboratory conditions. We determined developmental time of B. macroscopa larval, pupal, and pre-adult stage at different temperatures. Male and female longevity, male and female lifespan, mortality of immature stages, oviposition period of B. macroscopa were also investigated under six constant temperatures (21°C, 24°C, 27°C, 30°C, 33°C, 36°C), based on age-stage, two-sex life tables. The results revealed that eggs in 36°C were unable to hatch. At temperatures between 21°C -33°C, the duration of the pre-adult period, as well as the adult lifespan both for males and females, were shortened by increasing temperatures. The lowest larval mortality rate (15.33%) occurred at 27°C. The age-stage-specific fecundity rates with the greatest number were, in order, 30°C, 27°C, 21°C, 24°C and 33°C. The results show that B. macroscopa population levels could reach highest at the temperature of 27℃.
Highlights
The sweet potato leaf folder, Brachmia macroscopa Meyrick (Lepidoptera: Gelechiidae), is one of the most destructive pests on Dioscoreae sculenta, Ipomoea aquatic, Calystegia sepium, C. japonica and many other crops belonging in the Convolvulaceae
The current study investigated the impacts of temperature on the development and reproductivity of the sweet potato leaf folder, Brachmia macroscopa (Lepidoptera: Gelechiidae), in sweet potato leaves under laboratory conditions
Male and female lifespan, mortality of immature stages, oviposition period of B. macroscopa were investigated under six constant temperatures (21 ̊C, 24 ̊C, 27 ̊C, 30 ̊C, 33 ̊C, 36 ̊C), based on age-stage, two-sex life tables
Summary
The sweet potato leaf folder, Brachmia macroscopa Meyrick (Lepidoptera: Gelechiidae), is one of the most destructive pests on Dioscoreae sculenta, Ipomoea aquatic, Calystegia sepium, C. japonica and many other crops belonging in the Convolvulaceae. It is widely distributed in Europe, Russia, Caucasus, the Transcaucasian region, West Kazakhstan, central Asia, Korea, Japan, China, and northern India [1]. Larval damage to the host plant leaves results in complete loss of the mesophyll layer, leaving only the transparent leaf epidermis. The extent of damage may be severe enough to disrupt the host’s ability to photosynthesize, causing withering of the affected leaves, and in severe cases lead to death of the host plant. None of the previous studies have included quantitative
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