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Spatial Distribution of Larva and Assumption of the Oviposition Site of Ascotis selenaria in Citrus Orchards in Jeju, Korea
Ascotis selenaria is one of most important pest of geometridae moths in citrus orchards causing citrus fruit damages in jeju, Korea. Oviposition site had not been found on citrus tree, but was witnessed at the net adjacent of vinyl covering a green house in 2007. And then, A. selenaria larva highly clumped on the citrus(Shiranui : [C. unshiu × C. sinenesis] × C. reticulata) tree near the oviposition site and the ID(Index of Dispersion) value was 6.81. However, dispersion of A. selenaria larva was not clearly clumped in field citrus(C. unshiu) during 2008 and 2010. The value of GI(Green’s index) was 0.0179, 0.0208, and 0.0064, respectively. Those were so low that A. selenaria larva were distributed almost randomly in field citrus orchard. Consequently, it was assumed that A. selenaria female oviposited on a tree like Cryptomeria japonica surrounding a citrus orchard in field and hatched larva moved to citrus tree by drifting with winds.
