The ladybeetle, Delphastus catalinae (Horn), is one of the most commonly usedpredacious natural enemies being commercially reared for controlling whiteflies, including Bemisiatabaci (Gennadius) biotype B (= B. argenti...The ladybeetle, Delphastus catalinae (Horn), is one of the most commonly usedpredacious natural enemies being commercially reared for controlling whiteflies, including Bemisiatabaci (Gennadius) biotype B (= B. argentifolii Bellows and Perring), on various ornamental andvegetable crops under greenhouse conditions. The development, survivorship, and fecundity of D.catalinae feeding on B. tabaci biotype B on collard plants were determined in the laboratory, andthe age-specific life table parameters were analyzed based on the life history data. Developmentaltime was 4.0,1.9,1.1,1.4,5.2, and 5.3 days for eggs, first, second, third, fourth instars, andpupae, respectively, with an average of 18.9 days from oviposition to adult emergence for bothsexes, 19.0 days for females, and 18.8 days for males. Adult longevities averaged 146.6 days forboth sexes, 122.6 days for females, and 170.5 days for males. After an average 4.9 dayspreoviposition period, females laid a mean of 5.6 eggs per day over a 97.0-day period. Netreproductive rate (R_0) and gross reproductive rate (Σm_x) were estimated by life table analysis at276.8 and 325.1, respectively. Generation time (T) and doubling time (DT) were 35.6 and 4.8 daysrespectively, and the intrinsic rate of natural population increase (r_m) was estimated at 0.158, orl= 1.171 for the finite rate of increase. The r_m value of D. catalinae is similar to or higherthan those of the whitefly feeding on most vegetable and ornamental crops, indicating that theladybeetle is capable of regulating populations of B. tabaci biotype B and other whiteflies undergreenhouse conditions.展开更多
文摘The ladybeetle, Delphastus catalinae (Horn), is one of the most commonly usedpredacious natural enemies being commercially reared for controlling whiteflies, including Bemisiatabaci (Gennadius) biotype B (= B. argentifolii Bellows and Perring), on various ornamental andvegetable crops under greenhouse conditions. The development, survivorship, and fecundity of D.catalinae feeding on B. tabaci biotype B on collard plants were determined in the laboratory, andthe age-specific life table parameters were analyzed based on the life history data. Developmentaltime was 4.0,1.9,1.1,1.4,5.2, and 5.3 days for eggs, first, second, third, fourth instars, andpupae, respectively, with an average of 18.9 days from oviposition to adult emergence for bothsexes, 19.0 days for females, and 18.8 days for males. Adult longevities averaged 146.6 days forboth sexes, 122.6 days for females, and 170.5 days for males. After an average 4.9 dayspreoviposition period, females laid a mean of 5.6 eggs per day over a 97.0-day period. Netreproductive rate (R_0) and gross reproductive rate (Σm_x) were estimated by life table analysis at276.8 and 325.1, respectively. Generation time (T) and doubling time (DT) were 35.6 and 4.8 daysrespectively, and the intrinsic rate of natural population increase (r_m) was estimated at 0.158, orl= 1.171 for the finite rate of increase. The r_m value of D. catalinae is similar to or higherthan those of the whitefly feeding on most vegetable and ornamental crops, indicating that theladybeetle is capable of regulating populations of B. tabaci biotype B and other whiteflies undergreenhouse conditions.