بررسی تاثیر شرایط نگهداری از تخم غیر قابل تفریخ کنه Tyrophagous putrescentiae بر فراسنجه‌های جدول زندگی کنه شکارگر Amblyseius swirskii

Predatory mite, Amblyseius swirskii Athias-Henriot is one of commercial biological control agents of important greenhouse pests, especially thrips and whiteflies worldwide. The role of alternative foods for increase the performance of generalist predatory mites recently has been approved. Based on recent studies, non-hatchable eggs of mold mite, Tyrophagous putrescentiae (shrank) has shown a great potential as a supplementary food for development and reproduction of A. swirskii. The goal of current research was to evaluate the effect of two different maintenance conditions of the non-hatchable eggs including refrigerator (4°c) and freezer (-20°c) for 3 months, on the quality of the maintained eggs for the predatory mite, based on life table trails. The result indicated that deposit the eggs in refrigerator during three months can considerably reduce the egg quality, so that the predatory mite only had successful development to adult stage (4.23±0.08 day), but after mating did not capable to oviposit by feeding of that eggs.While maintenance of the eggs in -20 freezer protect the egg quality for development (5.8±0.1 day) and reproduction (fecundity 11.84±1.81 (egg/female) of the A. swirskii. Also intrinsic increase of the intrinsic rate of increase (r), finite rate of population increase (λ), net reproductive rate (R0), gross reproductive rate (GRR) and mean generation time (T) were 0.23±0.02 day-1, 1.26±0.03 day-1, 8.3±1.62 offspring, 10.97±2.16 offspring and 9.04±0.12 day, respectively. In comparison to -20 freezer, maintenance of the eggs in refrigerator cause significant reduction in adult longevity (from 6.92 to 3.33 day) and total longevity (from 12.15 to 6.68 day) and cause increase the mortality percent of pre adult stage (from 7.4 to 14.63 percent). It is concluded that maintenance condition of T. putrescentiae eggs has very important effects on the quality preservation and then nutritional value for the predatory mite.