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    Is the parasitization rate of Diaeretiella rapae influenced when Brevicoryne brassicae feeds on Brassica plants?
    (Springer, 2007) Bayhan, Selime Olmez; Ulusoy, M. Rifat; Bayhan, Erol
    The development time and parasitization rate of Diaeretiella rapae (M'Intosh) on Brevicoryne brassicae (L.) feeding on different Brassica cultivars was studied in the laboratory at 20 degrees C. The shortest development time from egg to adult parasitoid was 11.6 days on cabbage cv. 'Yalova 1' and the longest was 12.1 days on turnip cv. 'Antep' and rapeseed cv. local variety. Females lived significantly longer than males on the host plants used in the study. Females and males had the shortest longevity on rapeseed at 11.1 and 5.1 days, respectively. The highest percent parasitism of B. brassicae by D. rapae was found on cabbage (40.20%), and the lowest was recorded on turnip (32.64%). Our results demonstrate that parasitism rate could be influenced by the plant quality, probably due to the nutritional status of the aphids or to toxic compounds ingested through the plant. Cabbage, cauliflower and broccoli were found to be suitable plants for the parasitoid, considering the development time of pre-adults, and the parasitization rate of D. rapae on B. brassicae.
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    Öğe
    Population development and parasitism rate of Diaeretiella rapae (Hymenoptera: Braconidae) in Balcali (Adana), Turkey
    (Gaurav Soc Agricultural Research Information Centre-Aric, 2011) Bayhan, Selime Olmez; Ulusoy, Mehmet Rifat
    In this study, the population development and parasitisim rate of Diaretiella rapae parasitising Brevicoryne brassicae was evaluated on cabbage (Yalova 1), cauliflower (Early Snawball), broccoli (Marathon) and radish (Antep radish) in the experimental fields without any pesticides application in the research field of the Plant Protection Department, Faculty of Agriculture, University of Cukurova, between 2001 and 2004 in Turkey. During the monitored, naturally occurring aphids and mummies were counted. The population of B. brassicae and its parasitoid generally increased in December to January and March to April.
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    Öğe
    Studies on survival rate, reproduction and biological parameters of corn leaf aphid (Rhopalosiphum maidis Fitch) on five corn cultivars
    (Gaurav Soc Agricultural Research Information Centre-Aric, 2011) Bayhan, Erol; Bayhan, Selime Olmez
    The development, survival rate, reproduction and biological parameters of the corn leaf aphid, Rhopalosiphum maidis (Fitch) on five corn cultivars were evaluated at 25 degrees C in laboratory conditions. The corn leaf aphid had longer nymphal development on CR 955 than the other cultivars. The lower percentage survival rate was observed on CR 955 than the others. The corn leaf aphid reared on AG 9229 had the highest fecundity (70.75 offspring/aphid). The net reproductive rate (R(o)) was the lowest (70.85 offspring/aphid/generation) on AG 9229. The intrinsic rate of increase (r(m)) was lower on CR 955 than the other corn cultivars. CR 955 showed resistance to the pest.