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Population development of Frankliniella occidentalis and Thrips hawaiiensis in constant and fluctuating temperatures

Cao, Yu, Yang, Hong, Li, Jun, Zhang, Guozhou, Wang, Yawei, Li, Can, Gao, Yulin
Journal of applied entomology 2019 v.143 no.1-2 pp. 49-57
Frankliniella occidentalis, Rosa rugosa, Thrips hawaiiensis, adults, eggs, fecundity, flowers, host plants, indigenous species, insects, instars, interspecific competition, invasive species, sympatry, temperature, vegetables, China
Temperature fluctuations may influence the behaviour of insects. Frankliniella occidentalis and Thrips hawaiiensis are sympatric pests on flower and vegetable host plants in China. This study evaluated the influence of constant (23.0°C) and fluctuating temperatures (average of 23.0°C) on the population development of these two species. The results showed that both of these pests showed faster development and higher fecundity at a constant temperature than at fluctuating temperatures when fed on Rosa rugosa flowers, and F. occidentalis showed faster development and higher fecundity than T. hawaiiensis under both conditions. Under the constant and fluctuating temperatures, the development times from egg to adult were 9.57 and 10.62 day for F. occidentalis and 10.71 and 11.82 day for T. hawaiiensis, respectively. The total numbers of first instar nymph produced were 103.08 and 86.32 by F. occidentalis, 86.96 and 73.32 by T. hawaiiensis, under the constant and fluctuating temperatures, respectively, and a higher intrinsic rate of natural increase (rₘ) (0.173 and 0.160) and R₀ (46.31 and 36.86) were obtained in F. occidentalis compared with T. hawaiiensis (rₘ for 0.154 and 0.141 and R₀ for 34.46 and 27.81, respectively). Our results indicate that the constant temperature had a positive effect on the population development of both F. occidentalis and T. hawaiiensis. Furthermore, F. occidentalis showed a stronger adaptability over T. hawaiiensis at both constant and fluctuating temperatures, according to its faster development and higher fecundity. These results may contribute to the better understanding of the biology of different thrip species, especially the interspecific competition between invasive and native thrips under the changing environment. These findings also provide basic data for the thrip pests control by using fluctuating temperatures.