Bemisia tabaci (Homoptera: Aleyrodidae) instar effects on rate of parasitism by Eretmocerus mundus and Encarsia pergandiella (Hymenoptera: Aphelinidae)
Bemisia tabaci (Homoptera: Aleyrodidae) instar effects on rate of parasitism by Eretmocerus mundus and Encarsia pergandiella (Hymenoptera: Aphelinidae)
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DOI：
10.1111/j.1479-8298.2007.00246.x
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发表时间：
2008-03-01
影响因子：
0.9
通讯作者：
Liu, Tong-Xian
中科院分区：
文献类型：
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作者：
Greenberg, Shoil M.;Jones, Walker A.;Liu, Tong-Xian
比较了仅提供1个虫龄、同时提供2个不同虫龄和4个不同虫龄时，烟粉虱Gennadius、B型虫龄和pergandiella Howard的寄生偏好。在单星无选择治疗中，呃。寄生在较年轻的寄主上更成功。Pergandiella寄生在较大比例的老星上。当寄生蜂在6种不同的配对组合中选择2个龄期时，也观察到类似的结果。同时提供4个幼虫时，1、2、3个幼虫被Er寄生的数量。寄生蜂的寄生性差异不显著（10.3% ~ 16.4%），但均显著高于四龄若虫（2.1%）。寄生率最高。Pergandiella以3龄最高（17.2%），1龄最低（2.8%）。
Studies were conducted to compare preference among Bemisia tabaci Gennadius, biotype B instars for parasitization by Eretmocerus mundus Mercet and Encarsia pergandiella Howard when provided one instar only, two different instars, and four different instars simultaneously. In the single-instar no choice treatment, Er. mundus was more successful in parasitizing the younger host instars, while En. pergandiella parasitized a greater proportion of the older instars. Similar results were observed when parasitoids were provided a choice of two instars in six different pair combinations. When all four instars were provided simultaneously, the numbers of first, second, and third instars parasitized by Er. mundus were not significantly different from each other (range 10.3-16.4%), but all were significantly higher than parasitism of fourth instar nymphs (2.1%). The highest percentage parasitization by En. pergandiella was in third instar (17.2%), and the lowest in first instar (2.8%).