WITHIN-PLANT DISTRIBUTION OF TETRANYCHUS KANZAWAI KISHIDA (ACARI: TETRANYCHIDAE) ON MULBERRY

Abstract

Tetranychus kanzawai Kishida was observed to distribute equally between inner and outer layers of mulberry shoots. Higher population of spider mite was found frequently on leaf 5 to 11, the middle part, in a shoot. Approximately 33 to 79 percent of the spider mites in a shoot distributed in this zone depending on the length of the shoot. The correlation between the number of spider mites in this zone and in a shoot is very hight. It is suggested to sample T. kanzawai population on mulberry trees in this zone. 神澤氏葉蟎在桑樹之內層與外層間之分布無顯著差異。枝條上葉蟎較多之葉片常在第5至第11葉間，亦即枝條之中段。受枝條之長短影響，此區間之葉蟎約占全枝條之33-79%。其葉蟎總數與枝條上之葉蟎數具高度之相關性。作者建議在此區間取樣調查桑園中神澤氏葉蟎之密度。