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Articles by M.A. Al-Deghairi
Total Records ( 2 ) for M.A. Al-Deghairi
  Nagdy F. Abdel-Baky and M.A. Al-Deghairi
  Impact of the host plant type on certain biological aspects and parasitism level of E. mundus under laboratory and semi-field conditions was evaluated. The parasitoid biological aspects were greatly differed within the host type. Parasitoid life cycle was shorter on squash, followed by common beans and sweet pepper, which lasted 27.6±1.9, 25.9±1.3 and 23.7±1.1 days, respectively. In contrary, female longevity was shorter on the sweet pepper (9.9±1.6 days), followed by the common bean (10.8±1.1 days) and was longer on squash (11.7±1.3 days). Additionally, E. mundus life span and female fecundity were also studied and varied among the studied hosts. Effect of host plants on both colonization of pest nymphs and parasitism percentages, were also evaluated. Greater numbers of young and old nymphs and higher parasitism rates were observed on squash followed by common beans, whereas, sweet pepper was last in this respect. Subsequently, the reproduction and biological characteristics of E. mundus have been shown obviously to be influenced by host plant. Efficiency of releasing parasitoids was greatly affected by host plant type as well as releasing rates. Releasing the parasitoid with constant numbers against various population densities of the pest achieved different pest control levels. Releasing rates of 1:5 and 1:10 (parasitoid:pest) gave good control measures, whereas, moderated control levels were fulfilled with ratios 1:20 and 1:30. Increasing pest densities negatively correlated with good control measures.
  A.H. Fouly , M.A. Al-Deghairi and N.F. Abdel Baky
  Development, feeding capacity and life table parameters of the predatory mite Typhlodromips swirskii (Athias-Henriot) fed three different levels of whitefly eggs Bemisia tabaci Genn. were studied under laboratory conditions of 26°C and 70% RH. Both organisms were collected from eggplant leaves growing in an greenhouse in Al-Qassim region, center of Saudi Arabia in 2009. In leaf disc assays, increasing number of prey eggs accelerated the development of T. swirskii. Duration of developmental stages and feeding capacity of T. swirskii were significantly affected by the number of whitefly eggs offered. During an ovipositional period of 13.1, 18.9 and 19.5 days, adult female of T. swirskii consumed an average of 41.6, 128.4 and 140.1 prey eggs when each female was provided with 4, 8 and 12 prey eggs day-1 and laid an average of 10.5; 12.8 and 15.7 eggs day-1, respectively. Offering the predatory mite with 4, 8 and 12 prey eggs day-1 caused a mean generation time (T) of T. swirskii was 17.15; 17.66 and 15.45 days while, the net reproductive rate (Ro) averaged 10.86, 20.98 and 22.12 female progeny/female and the intrinsic rate of increase (rm) of T. swirskii was 0.22, 0.17 and 0.14 female progeny/female/day, respectively. The finite rate of increase erm (λ) was at its highest level (1.23) when T. swirskii individuals was provided with 12 eggs day-1 and declined to 1.19 and 1.15 after feeding on 8 and 4 prey eggs day-1, respectively. Crowding of T. swirskii significantly decreased feeding capacity and egg deposition.
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