Development of the Tea Red Spidermite, Tetranychus kanzawai

간자와응애의 발육(發育)에 관한 연구(硏究)

The tea red spider mite has recently outbroken as the major pest of tea at tea plantation area in southern part of Korea. This study was carried out to investigate some development of the tea red spider mite. The results were summarized as follows: 1. The body length and width of adult female and male were 0.40mm and 0.22mm, and 0.31mm and 0.20mm, respectively. 2. Durations of immature stage of females were 24.8 days at $16^{\circ}C$, 17.0 days at $20^{\circ}C$, 11.0 days at $24^{\circ}C$, 8.2 days at $28^{\circ}C$, and 6.7 days at $32^{\circ}C$. 3. The average longevities of female of the tea red spider mite were 31.5 days at $16^{\circ}C$, 13.4 days at $20^{\circ}C$, 8.4 days at $24^{\circ}C$, 7.8 days at $28^{\circ}C$, and 5.8 days at $32^{\circ}C$.

차와 딸기등 많은 밭작물에 피해(被害)가 큰 간자와응애에 대(對)한 형태(形態)와 온도별(溫度別) 발육기간(發育期間) 및 성충수명(成蟲壽命)등을 조사한 결과는 다음과 같다. 1. 간자와응애의 크기에 있어서 자성충(雌成蟲) 체장(體長) 및 체폭(體幅)은 0.40mm와 0.22mm이었고 웅성충(雄成蟲)은 0.31mm와 019mm로서 자성충(雌成蟲)이 현저히 컸다. 2. 온도별(溫度別) 발육기간조사(發育期間調査)에서 미숙기를 살펴보면 $16^{\circ}C$가 24.8일(日)로 가장 길었으며 $32^{\circ}C$가 6.7일(日)로 가장 짧은 것을 알 수 있었다. 3. 성충수명(成蟲壽命)은 $16^{\circ}C$, $20^{\circ}C$, $24^{\circ}C$, $28^{\circ}C$, $32^{\circ}C$에서 각각 31.5일(日), 13.4일(日), 8.4일(日), 7.8일(日), 5.8일(日)로 온도가 낮을수록 수명이 길었다.