Development and reproduction characters of Frankliniella occidentalis fed on tobacco under elevated CO₂ concentration

【Objective】This study was designed to clarify the development and reproduction characteristics of Frankliniella occidentalis on tobacco under high CO₂ concentration, and lay a foundation for pest control under the background of increasing atmospheric CO₂ concentration, and reducing the occurrence of tomato spotted wilt virus(TSWV) on tobacco.【Method】The developmental time, survival rate, fecundity(offspring sex ratio, female life span, average oviposition period, oviposition rate per female and daily oviposition rate per female) and population parametersnet reproductive rate(R₀), generation span(T), intrinsic rate of increase(r_m), increment rate per unit(λ) and the time of double population size(DT)of F.occidentalis were measured for F.occidentalis fed on isolated kidney bean and tobacco leaves under 400μL/L and 800μL/L CO₂ concentrations in artificial climate chambers, which was to interpret the growth and reproduction characteristics of F.occidentalis on tobacco under high CO₂ concentration.【Result】Under the two CO₂ concentrations(400μL/L and 800μL/L), F.occidentalis could grow, develop and reproduce normally on tobacco, but the cumulative survival rate from the 1^st instar to adults were only 46.67% and 55.00%, respectively, which were 52.84% and 60.00% of those on kidney bean under the same CO₂ concentration, adult longevity was significantly shortened(P< 0.05, the same below), and the developmental durations of egg, 1^st-2^nd instar and the immature stage of F.occidentalis fed on tobacco were significantly prolonged.Under the same CO₂ concentration, R₀, T, r_m and λ of F.occidentalis fed on tobacco were significantly lower than those on kidney bean, and DT was significantly increased;female life span, average oviposition period, oviposition rate per female and daily oviposition rate per female of F.occidentalis fed on tobacco were 53.05%, 45.40%, 26.32% and 55.73% of those on kidney bean under normal CO₂ concentration(400μL/L), respectively, while they were only 49.60%, 44.03%, 23.55% and 54.75% of those on kidney bean under elevated CO₂ concentration(800μL/L).The developmental duration of the 1^st-2^nd instar and immature stage of F.occidentalis fed on tobacco under high CO₂ concentration were significantly longer than those under the normal CO₂ concentration, while the case for those on kidney bean were the opposite.The survival rate of F.occidentalis fed on kidney bean and tobacco were higher under high CO₂ concentration than those under normal CO₂ concentration, offspring sex ratio, oviposition rate per female and daily oviposition rate per female of F.occidentalis were increased, and average oviposition period of F.occidentalis was prolonged;R₀, r_m, and λ of F.occidentalis fed on kidney bean and tobacco under high CO₂ concentration were significantly higher than those under normal CO₂ concentration, and DT was significantly shortened.【Conclusion】F.occidentalis can grow, develop and reproduce normally on tobacco, and might be beneficial to its population growth under elevated CO₂ concentration, which can aggravate the harm of tomato spotted wilt virus on tobacco.