Development and Reproductive Capacity of Protopulvinaria mangiferae (Green) (Homoptera: Coccidae)

담팔수깍지벌레의 발육과 증식능력

This study was carried out in the laboratory to clarify effects of different temperature of Protopulvinaria mangiferae(Green) on development, survivorship and reproduction. Developmental period of the mango shieldscale from crawlers to preoviposition adult decreased as temperature increased. The threshold temperature andthermal constants for the development of one generation were 11.7"C and 1000.0 day-degrees, respectively. At25$^{\circ}$C and 30$^{\circ}$C, survival rate from egg to preoviposition adult were 82% and 6096, respectively. Hatchability ofeggs was more than 99% at both condition. The reproductive period overaged 50 days(2SnC) and 33 days(30$^{\circ}$C). After mature adult began to reporduce, and more than 50% of the crawlers emerged during the firsthalf of their life time. The net reproduction rate per generation(R), mean length of a generation0 and intrinsicrate of natural increase(r, ) were higher at 25$^{\circ}$C than at 30"C, and the values measured at 25$^{\circ}$C were 132.6, 76.2 and 0.064/female/day, respectively.

담팔수(Elaeocarpus sylvestris va. ellipticus Hara)를 기주로 하여 담팔수깍지벌레(Protopulvinaria mangiferae (Green))의 발육속도 및 증식능력을 조사하였다. 본 깍지벌레의 1령약충기부터 산란전성충기까지 발육소요일수는 온도가 상승할수록 짧았으며, 발육한계온도는 11.7$^{\circ}C$, 유효적산온도는 1000.0일도 이었다. $25^{\circ}C$, $30^{\circ}C$ 항온, 60-70% RH조건하에서 부화율은 각 온도구 모두 99% 이상으로 높았다. 산란전성층까지의 생존율은 $25^{\circ}C$에서 82%, $30^{\circ}C$에서 60%이었으며, 1령약충(neonate crawler)기의 사망률이 가장 높았다. 성충체로부터 1령약충의 이탈기간은 $25^{\circ}C$에서 50일 $30^{\circ}C$에서 33일간 이었으며, 이 기간 중 총이탈약충수의 50%이상이 분산기간 초기에 발생되었다. 발육기간 및 영별생존율 및 출생수를 이용하여 산출한 순번식율(${R}_{o}$), 평균세대기(T) 및 내적자연증가율은(${r}_{m}$)은 $25^{\circ}C$에서 각 132.6, 76.2, 0.064/암컷/일로 $30^{\circ}C$구 보다 높았다.