Influence of different diets on some biological characteristics of predatory bug, Macrolophus pygmaeus Rumbur (Hemiptera: Miridae) under laboratory conditions
عنوان دوره: دومین کنگره بین المللی حشره شناسی ایران
نویسندگان
چکیده
Macrolophus pygmaeus Rambur is one of the omnivorous predators which has considered in integrated pest management programs, especially in greenhouse. In this study, biological properties and life table parameters of M. pygmaeus were studied by feeding on eggs of Ephestia kuehniella and Artemia sp. cysts under laboratory conditions (25±1°C, 65±5 % RH and 16:8h L: D photoperiod). For this experiment, 60 repetitions were considered. The pods of green bean Phaseolus vulgaris L. served as oviposition substrate and the moisture source for Macrolophus. Data were analyzed with according to the age-stage, two-sex life table theory (Chi, 2015). TWOSEX-MSChart Computer program was used to analyze the data (Chi, 2015). The results showed, developmental time in nymphal stages which feed on the eggs of E. kuehniella and Artemia cysts for males and females were 17.04 ± 0.11, 18.06 ± 0.18, 17.31 ± 0.09 and 18.17 ± 0.15 days respectively. The longevity for males and females were 23.80 ± 1.22, 22.0 ± 0.68 and 21.55 ± 1.20, 19.06 ± 0.96 days respectively; the mean of fecundity were 37.48 ± 3.65 and 35.67 ± 4.14. life span, as well as intrinsic rate of natural increase (rm) calculated as 0.08 ± 0.004, and 0.06 ± 0.005 d-1 on the first and second diet respectively. Additionally, finite rate of increase (λ) recorded 1.08 ± 0.004, and 1.07 ± 0.005 d-1 and net reproductive rate (R0) as 18.12 ± 2.31, and 10.70 ± 1.88 (eggs/individual) respectively. Furthermore, mean generation time (T) estimated as 35.93 ± 0.26, and 36.66 ± 0.41 days and gross reproduction rate (GRR) 21.53± 2.68, and 19.14± 3/05 (eggs/individual) respectively. The results indicated the different diets have significant differences on nymphal period, net reproduction rate and longevity of M. pygmeaus. Also the results showed that feeding on E. kuehniella eggs reduces nymphal period, increase productivity and longevity of adults. According to the present results, E. kuehniella is more suitable prey for breeding of this predator.
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