大豆荚饲养点蜂缘蝽实验种群生殖力及其种群趋势分析

点蜂缘蝽(Riptortus pedestris)是大豆生产上的重要害虫.为明确结荚期大豆对点蜂缘蝽生殖力及种群发育的影响,为了解种群发生动态、预测预报及制定综合治理措施提供科学依据,在24±1℃恒温下,采用离体豆荚饲养法,系统观测点蜂缘蝽存活和生殖等生物学指标,通过种群生命表分析,进一步探讨其种群生殖力及种群趋势.结...

Analysis of fertility and population trend of experimental population of Riptortus pedestris fed on soybean pods

Riptortus pedestris is an important pest in soybean production. For further understanding the population dynamics, forecasting and formulating integrated pest management for R. pedestris in soybean fields, fecundity and population development of R. pedestris, biological parameters of viability and fertility were systematically observed using pod culture in vitro at a constant temperature of 24℃±1℃. The fecundity and population trend were further discussed through the analysis on life table of population. Results showed that the generation duration of R. pedestris fed on soybean pods lasted 54.69 d. The average adult life span was 49.18 d, and life spans of male and female adults were 46.26 d and 52.75 d respectively. The average pre-oviposition duration of R. pedestris was 6.60 d. The average oviposition duration was 36.97 d. The average fecundity per female was 116.62. The trends accorded with model of Logistic regression and exponential function. And its daily cumulative fecundity trends accorded with the model of exponential function and trinomial regression. The fecundity trends of female adults showed a skewed distribution. Fifty percent of fecundity were concentrated in the first 25% of the spawning period. The life table analysis showed that intrinsic growth rate (r_m ) was 0.0717, net value-added rate (R₀ ) was 50.53, finite rate (λ) was 1.07 d^-1, population doubling time was 9.66 d, and population trend index was 48.07. Therefore, the fresh soybean pods in vitro could fully meet the nutritional needs of the individual development of R. pedestris, and the pod during podding stage could be a main source of nutrition for R. pedestris population in fields.