Eretmocerus eremicus is the most abundant parasitoid of the Bemisia complex in North America. It can parasitize equally successfully the most common whiteflies in greenhouses, Trialeurodes vaporariorum and the Bemisia complex. The parasitoid is used in Europe for whitefly control, either alone or in combination with releases of Encarsia formosa. Life-cycle and demographic parameters of this par...

the influence of leaf pubescence of three wheat cultivars (pishtaz, ghuds and falat) on preference and biological parameters of sipha maydis (passerini) was investigated under greenhouse conditions (25 ± 2 °c, 70 ± 10% rh and 14: 10 h (l: d) photoperiod). the results showed that pishtaz had a greater density of trichomes compared to the other cultivars. in the preference test with whole plant, ...

Life table of Tetranychus urticae and Phytoseiulus persimilis on bean leaflets were studied under laboratory conditions in three seasons. For T. urticae the development time from egg to adult varied from 7 to 24 days and the highest immature mortality was 78.70 % in winter. Eggs laid by females were 88.1 eggs in autumn and 70.6 eggs in summer season. The gross reproductive rate (GRR) was the hi...

The intrinsic rate of increase is a basic parameter which an ecologist may wish to establish for an insect population. We define it as the rate of increase per head under specified physical conditions, in an unlimited environment where the effects of increasing density do not need to be considered. The growth of such a population is by definition exponential. Many authors, including Malthus and...

dried fruit mite, carpoglyphus lactis l. not only to being one of the serious and economic pests of some stored products, but also to be used as an alternative prey for commercially mass rearing of predatory mites. in this study, life table parameters of dried fruit mite were examined on baker's yeast under laboratory conditions at three photoperiods including full darkness, full light and 16 :...

development, reproduction and life table parameters of tetranychus urticae koch were determined on leaves of peach (g. h. hale cultivar) at different temperatures, ranging from 13 to 33°c under laboratory conditions. no development was observed at 13°c. egg-to-adult developmental time decreased gradually from 17 to 27°c and increased at higher temperatures (27 to 33°c). an average of 136.43 deg...

the biological parameters of sympiesis striatipes ashmead, one of the most abundant hymenopterous ectoparasitoid of phyllocnistis citrella stainton in ehime province of japan, were studied under laboratory and field conditions. the mean immature developmental time and adult longevity at different temperatures (22 to 31â°c), 50-70% rh and 12l: 12d photoperiod decreased as the temperature increas...

the biology of chrysocharis pentheus (walker) (hymenoptera: eulophidae), the most abundant endoparasitoid of phyllocnistis citrella stainton (lepidoptera: gracillariidae) in ehime prefecture, japan, was studied under laboratory and field conditions. the mean immature developmental time and adult longevity at different temperatures (22 to 31°c) under 50-70% rh decreased as the temperature increa...