Population Ecology of Aulacaspis yabunikkei Kuwana and Aulacaspis murrayae Takahashi (Hemiptera: Diaspididae) in Taipei Area
Date Issued
2005
Date
2005
Author(s)
Lin, Yu-An
DOI
zh-TW
Abstract
The objectives of this study is to observe the effect of temperature on the development of Aulacaspis yabunikkei Kuwana and A. murrayae Takahashi and estimate the popultation parameters of the two species and investigate their population fluctuation in field during November 2003 to January 2005. They were reared on their main host plant camphor trees (Cinnamomum camphora) and orange-jessamine (Murraya paniculata (Linn.) Jack) respectively in walk-in growth chambers under five constant temperatures, 15, 20, 25, 30 and 35℃. The developmental time of these two species from egg to adult decreased with the increase of temperature from 15℃ to 35℃. The results showed that an increase in temperature within limits accelerated the rate of development of all stages. These scales can complete their life history successfully except 15℃ for A. yabunikkei. A. murrayae took 51.96, 40.71, 30.13, 21.25 and 18.47 d to develop from egg to adult at 15, 20, 25, 30, and 35℃, respectively. A linear regression of developmental rate against temperature was established to estimate their low developmental threshold temperature (Tb) and thermal summation (K) that were 3.62, 6.23, and 6.88℃and took 200, 156, and 192 DD (degree-days) for egg stage, crawlers, and second instar of female A. murrayae, respectively. The low developmental threshold temperature (Tb) and thermal summation (K) were 3.3, 5.26, 5.7℃ and 200, 154, 200 DD of for egg stage, crawlers, and nymphal stage of male, respectively. The developmental duration of A. yabunikkei from egg to adult at 20, 25, 30, and 35℃ were 63.32, 42.17, 25.36 and 21.5 d, respectively. The low developmental threshold temperature (Tb) and thermal summation (K) were 12.8, 11.8, 14.2℃ and 136, 127, 192 DD for egg stage, crawlers, and second instar of female. And the low developmental threshold temperature (Tb) and thermal summation (K) were 15.5, 12.6, 16.8 and 91, 98, 103 DD of for egg stage, crawlers, and nymphal stage of male, respectively. The population of A. yabunikkei increased in February, reached three peaks in April, June, July and May, July, Auguest of female and male, respectively. There are five to six annual generations of A. murrayae in Taipei during 2004－2005. The population of the female adult scale had lowest density in January. It increased in February and reached five peaks in February, March, May, September, November and March, April, June, September to October, November of female and male respectively. Aphytis sp. and Coccobius sp. are the parasitoids of A. yabunikkei found on females, and Aphytis sp. is also found on males. Aphytis sp., Coccobius sp., Microterys sp., and Encarsia sp. are the parasitoids of A. murryae on females, and Aphytis sp. is found on males, too.
Subjects
樟白輪盾介殼蟲
月橘白輪盾介殼蟲
族群介量
族群變動
寄生蜂
popultation parameters
fluctuation
parasitoids
Aulacaspis yabunikkei Kuwana
Aulacaspis murrayae Takahashi
Type
thesis
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