제주 재배 감귤 품종에서 귤응애(Panonychus citri)의 생명표 통계량

Abstract

The citrus red mite, Panonychus citri (Acari: Tetranychidae), is a serious pest in citrus orchards in Jeju, Korea. In this studies, life table parameters of P. citri were estimated by using the age-specific survival and age-specific fecundity data on six cultivars of citrus. The egg incubation times were shorter on Shiranui, Kiyomi and Lemon as 7.7, 7.8, 7.5 days(d), respectively, than other species of citrus. The development time of deutonymph was shortest on Kiyomi as 1.7 d. Total immature development time was shortest on Kiyomi as 13.3 d, while it was longest on Miyagawa as 15.4 d. In the experiments for the fecundity on different species of citrus, a higher fecundity was observed on Shiranui and Lemonon as 39.6 and 29.7 eggs, respectively, while a lower fecundity was obtained on Kiyomi and Setoka as 21.6 and 21.1 eggs, respectively. The obtained development and fecundity data were subjected to estimate the life table parameters of P. citri on different species of citrus leaves: net reproductive rate, generation time, intrinsic rate of natural increase, finite rate of increase and doubling time. The estimated values for intrinsic rate of natural increase which affect directly population increase in the field were high on Shiranui and Lemon as 0.1519 and 0.1395, respectively; while the values were low on Setoka and Kabusu as 0.1056 and 0.1177, respectively. To analyse the effects of inorganic nutrient contents in citrus leaves on the development time and fecundity of P. citri , Pearson correlation coefficients were estimated between the paired variables. The results showed no statistical significantly between differences contents and development or fecundity, although there were a higher positive correlation in P, K, and Na contents.