Journal of Taiwan Agricultural Research

Author:Yi-Ju Chen, Feng-Chyi Lin*, Yi-Chung Chiu, and Hsien-Tzung Shih

Abstract:

    The chilli thrips, Scirtothrips dorsalis Hood (Thysanoptera: Thripidae), is one of key pests of mangoes (Mangifera indica Linn). Its life history was measured at constant temperatures of 20, 24, 28, and 32℃ on mango for evaluating the effect of the temperatures on development and fecundity of chilli thrips. Results showed that the survival rate of immature stages exceed 80% at four temperatures. The total developmental time decreased as the temperatures increased from 20, 24, 28, to 32℃ were 21.5, 14.8, 12.1, and 9.8 days, respectively; the mean longevity of the female was 26.3, 17.4, 19.8, and 13.2 days; and the mean fecundity per female was 37.3, 38.4, 74.0, and 40.0 eggs. The linear models adequately described the relationship between temperature and developmental rates for immature stages of chilli thrips. Thus, thrips required 219.1 degree-days to complete development from egg to adult stage, above a low threshold of 9.6℃ as estimated by linear regression. According to annual effective accumulated temperatures in Tainan climate condition, chilli thrips are expected to have about 40 generations per year, and the outbreak of population density appear from February to June in Tainan mango orchard.

Key words:Scirtothrips dorsalis Hood, Chilli thrips, Mango, Development, Reproduction

Download: PDF Links