Life table parameters of Phytoseius plumifer (Phytoseiidae) fed on two-spotted spider mite at different constant temperatures

摘要

The life table parameters of Phytoseius plumifer Canestrini & Fanzago fed on corn pollen and nymphal stages of Tetranychus urticae Koch were determined at eight constant temperatures (10, 15, 20, 25, 27, 30, 35 and 40 ± 1°C), 50 ± 5% relative humidity and a photoperiod of 16:8 h (L:D). Fifty 1-day-old eggs of P. plumifer were kept individually in a growth chamber at each temperature and all events were recorded daily for all immature and adult stages. Adult female longevity decreased from 73.42 days at 15°C to 34.73 days at 35°C. The net reproductive rate (R ₀) increased with increasing temperature from 15°C (8.70 females/female) to 27°C (29.6 females/female) and then decreased noticeably. The values of the intrinsic rate of increase (r_m ) and finite rate of increase (λ) were recorded to be highest at 30°C (0.257 day-1 and 1.29 day-1, respectively), which decreased at 35°C (0.244 day-1 and 1.28 day-1, respectively). The mean generation time (T) decreased significantly with increasing temperature from 15°C (48.75 days) to 35°C (11.02 days). The shortest doubling time (DT) was observed at 30°C (2.69 days). The highest and lowest values of total fecundity were obtained at 25°C (49.10 eggs/female) and 35°C (19.71 eggs/female), respectively. Our findings revealed that the examined population of P. plumifer can develop and reproduce under a wide range of temperatures (15-35°C), but its potential for control of two-spotted spider mite in the field has yet to be determined.View full textDownload full textKeywords Phytoseius plumifer , life table, fecundity, constant temperatures, Tetranychus urticae Related var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/01647954.2012.657239