Cabbage whitefly, Aleyrodes proletella L. (Hemiptera: Aleyrodidae), causes severe damage to Brassica vegetables. This study was conducted to evaluate the seasonal population dynamics of A. proletella and its parasitoids throughout the 2016 and 2017 growing seasons in Düzce Province in Turkey. To estimate whitefly density and parasitism rates, collard leaf samples infested with whitefly were collected from fields where no pesticides were applied. Collard leaves were cultured for emergence of the adult parasitoids, which were identified as Encarsia tricolor Forster (Hymenoptera: Aphelinidae) based on morphological and molecular characteristics. Seasonal mean densities of A. proletella ranged from 11.20 to 19.30 nymphs/leaf in 2016 and from 15.19 to 86.66 nymphs/leaf in 2017. The highest parasitism rates were 6.46% and 24.79% in 2016 and 2017, respectively. Whitefly nymphs peaked in July and August during both years. The first parasitized whitefly nymphs were observed in July, and maximum parasitism rates occurred in the second half of August during both years. These findings provide significant contributions for studies involving the conservation of parasitism of A. proletella.

中文翻译：

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土耳其杜兹塞省无翅无翅小花（Aleyrodes proletella L.（Hemiptera：Aleyrodidae）及其寄生虫的种群动态

白菜粉虱Aleyrodes proletella L.（半翅目：Aleyrodidae）对芸苔属蔬菜造成严重损害。这项研究的目的是评估土耳其杜兹省2016年和2017年整个生长季的无脊椎动物链球菌及其寄生虫的季节性种群动态。为了估计粉虱的密度和寄生率，从没有施用农药的田地收集了粉虱侵染的衣领叶样品。培养散叶甘蓝的叶子以发现成年的寄生虫，根据形态和分子特征将其鉴定为三色Encarsia Forster（Hymenoptera：Aphelinidae）。无脊椎动物曲霉的季节性平均密度2016年从11.20到19.30仙/叶，2017年从15.19到86.66仙/叶。2016年和2017年最高寄生率分别为6.46％和24.79％。粉虱若虫在这两年的七月和八月达到顶峰。在7月观察到了第一批被寄生的粉虱若虫，在这两年中，最大的寄生率发生在8月下半月。这些发现为涉及无性产假单胞菌的寄生虫保护的研究提供了重要的贡献。