室内条件におけるミカンハダニの増殖と分散に関与する要因

概要

論文の詳細を見る
The citrus red mite was reared singly or in a group on a citrus leaf at 25℃ with 16 hr illumination. The net reproduction rate per generation (R_0) and the intrinsic rate of natural increase (r) were estimated to be 19.57 and 0.1708,respectively, on the basis of the results of the individual rearings. When a single female adult was introduced on a citrus sapling, the number of female adults increased rapidly for 3 or 4 generations to reach peak density and then decreased drastically to a low level. The phase of population increase corresponded well with the equation of exponential growth (N_t=N_0e^<r_0t>), and the instantaneous growth rate (r_0) was estimated to be 0.113,which was very close to the estimated value of the intrinsic rate of natural increase. The rapid decline of the mite population after attaining peak density was mainly caused by the dispersal of adults. The dispersal occurred when the population increased to a high density of 40 or more female adults per leaf, which caused serious deterioration of the leaf (indicated by 80〜100% of an index of injury). A mass dispersal of adults from one leaf to others was often observed under such conditions.
日本応用動物昆虫学会の論文
1978-02-25