Biology and fecundity life table of predatory bug, Orius albidipennis (Reuter) on different diets and its some sexual and reproductive behaviors

شهیم قلعه¬چه, خلیل and حسن¬پور, دکتر مهدی and گلی¬زاده, دکتر علی and فرشباف پورآباد, دکتر رضا and رفیعی دستجردی, دکتر هوشنگ (2011) Biology and fecundity life table of predatory bug, Orius albidipennis (Reuter) on different diets and its some sexual and reproductive behaviors. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

The predatory bug, Orius albidipennis (Heteroptera:, Anthocoridae) is a promising biological control agent for mass production and augmentative releases against different pests specially greenhouse pests. However, the main problem for mass production of a biocontrol agent is determining the appropriate diet for its rearing. Therefore in this research, the effects of five different diets including eggs of Anagasta kuehniella with fresh corn pollen, eggs of A. kuehniella, fresh corn pollen, corn pollen collected in 2 years ago and the bean pod were studied on biology and stable population growth parameters of O. albidipennis at 26±1°C, 50-60% RH, and a photoperiod of 16:8 h (L:D). The experiment was started with 60 one-day-old nymphs for each diet. The nymphs were separately fed on each diet. After adult's emergence, male and female bugs were paired in a distinct dish and fed on each diet separately until all of the bugs died. In all treatments, bean pods were used as an oviposition substrate and a moisture supply. The stable population growth parameters were estimated using Carey's (1993) procedure. None of the bugs were completed their nymphal period on the bean pod diet. Mean developmental period of nymphs on other remained diets, eggs of A. kuehniella with fresh corn pollen, eggs of A. kuehniella, fresh corn pollen and corn pollen collcted in two years ago were 12.41±0.14, 12.67±0.29, 17.53±0.37 and 17.53±0.42 days, respectively. Mean number of eggs per female on the before-mentioned diets were estimated to be 155.91±10.78, 99.05±8.75, 15.42±2.21 and 3.69±0.58, respectively. Net reproductive rates (R0) were 51.15±7.21, 31.35±5.43, 4.91±1.11 and 1.26±0.25 femele/female/generation, respectively. Intrinsic rate of increase (rm) on the mentioned diets were estimated to be 0.1495±0.0057, 0.1381±0.0071, 0.0497±0.0071 and 0.0032±0.0018 female/female/day, respectively. The results revealed that adding corn pollen to diet of O. albidipennis can increases adult female longevity, oviposition period, number of offspring, survival rate as well as intrinsic rate of increase ( rm) and net reproductive rate (R0¬) values of the predator. According to results obtained in numerical response study of O. albidipennis to different densities of A. kuehniella, the highest ECI of the predator was obtained in densities of 5 and 35. The results of study of mating behavior of O. albidipennis revealed that unmated females are unable to oviposition. We found that the males of this predator can mate with more than one female. Also, the results showed that the presence of more than one male along with of a female can significantly decreases the female's offspring.

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