| Summary: | 碩士 === 國立中興大學 === 昆蟲學系 === 87 === ABSTRACT
The development and survivorship of Chilocorus kuwanae (Silvestri) were measured at 18, 20, 25 and 30℃. The developmental time from egg to adult stage were 67.7, 55.8, 35.3 and 32.2 days, respectively. The survival rate from egg to adult at 18, 20, 25 and 30℃ were 26.7, 66.7, 53.3 and 40%, respectively. The regression analysis of the developmental time from each stage to the temperature is linear relationship. The lower-temperature developmental thresholds (To) values of the egg , 1st instar, 2nd instar, 3rd instar, 4th instar, prepupa, pupa and adult are 8.4, 6.4, 9.4, 5.7, 1.8, 10.6, 9.9 and 7.4℃, respectively. The mean degree-days required for the total development are 136.8、97.3、61.0、75.6、174.2、36.3 and 111.3 degree-days, respectively. The average longevity of adults ranged from 159.5 day at 18℃ to 28.2 days at 30℃. The mean number of prey consumption of C. kuwanae adult, within 30 days, prey on 10-day-old, 20-day-old and 30-day-old of P. pentagona were 728.9, 133.7, and 55.3, respectively. Predation by C. kuwanae adult beetles were affected by the age of the scale. The surveillance of C. kuwanae larvae and adults populations at Mei-feng ( Nan-tou County) from January 1998 to April 1999. The C. kuwanae population peak were found in January and February in 1998, after March the larvae population were decreased, until the next January and February in 1999 the C. kuwanae larvae population peak were found again.
|
|---|
