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Spatial Distribution of Mulberry Thrips, Pseudodendrothrips mori Niwa (Thysanoptera: Thripidae) Hesami, Shahram; Etebari, Kayvan; Pourbabaeig, Hassan & Kamelmanesh, Mohammad Mojtaba Abstract Pseudodendrothrips mori is a serious pest to mulberry trees and its infestation affects the qualitative and quantitative characteristics of mulberry leaves consumed by silkworm. The spatial distribution of mulberry thrips within plant and orchard was assessed using Taylor's power law and Morisita's index of dispersion. The results showed that P. mori populations were localized in certain parts of the trees and fields. Distribution of thrips within plant showed that the larval instars were located on lower canopy (leaves 5-10 from top) of trees but adults preferred the upper canopy (leaves 1-5 from top). The thrips density did not vary significantly among the leaf direction inside the trees. The thrips tended to be more accumulated on the trees located in East, South and North than in Center and West of orchard. The distributions of P. mori adults and larvae on the leaves were aggregated. Keywords Mulberry thrips Pseudodendrothrips mori spatial distribution Taylor's power law Iran

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