Negm Mohamed W, Alatawi Fahad J, Aldryhim Yousif N
Acarology Laboratory, Department of Plant Protection, College of Food & Agriculture Sciences, King Saud University, 11451, P.O. Box 2460, Riyadh, Saudi Arabia Acarology Laboratory, Department of Plant Protection, College of Food & Agriculture Sciences, King Saud University, 11451, P.O. Box 2460, Riyadh, Saudi Arabia
Acarology Laboratory, Department of Plant Protection, College of Food & Agriculture Sciences, King Saud University, 11451, P.O. Box 2460, Riyadh, Saudi Arabia.
J Insect Sci. 2014 Jan 1;14:177. doi: 10.1093/jisesa/ieu039. Print 2014.
The old world date mite, Oligonychus afrasiaticus (McGregor) (Acari: Tetranychidae) is a severe spider mite pest of date palm in most of the Middle East and North Africa. Considering that nothing is known about the performance of phytoseiid predators against O. afrasiaticus, biology, predation, and life table parameters of Cydnoseius negevi (Swirski and Amitai) and Neoseiulus barkeri Hughes (Acari: Phytoseiidae), collected from date palm orchards, were studied under laboratory conditions (25, 35°C and 35 ± 10% RH) as a first step to understand their effectiveness against all mobile life stages of O. afrasiaticus. For both predators, oviposition period was significantly shorter at 35°C than at 25°C. The following parameters were obtained for C. negevi and N. barkeri at 25 and 35°C, respectively: female longevity, 31.8, 20.1, 35.7, 27.4 d; fecundity, 21.6, 38.0, 18.8, 34.8 eggs per female; oviposition period, 23.9, 13.7, 25.9, 18.1 d. Total predation of C. negevi and N. barkeri female was 246.0, 270.0, 227.6, 205.3 prey at 25 and 35°C, respectively. Rectal plugs were observed attached to the opisthosoma of some adult females of N. barkeri, which often cause the mite to stick to the surface. Life table parameters were estimated as net reproductive rate (R0) 10.44, 17.35, 10.19, 13.84, intrinsic rate of increase (rm) 0.14, 0.19, 0.13, 0.16 d(-1), finite rate of increase (λ) 1.15, 1.21, 1.12, 1.17 d(-1), generation time (T) 17.03, 15.17, 17.83, 16.61 d, doubling time (DT) 04.95, 03.64, 05.33, 04.33 d for C. negevi and N. barkeri at 25 and 35°C, respectively. The values of intrinsic rate of increase and net reproductive rate were higher in C. negevi than N. barkeri at both temperature regimes. Therefore, it could be concluded that C. negevi performance was better than N. barkeri against O. afrasiaticus and can be considered as a valuable addition to the existing methods for spider mites control.
东方小爪螨，Oligonychus afrasiaticus（麦格雷戈）（蜱螨亚纲：叶螨科）是中东和北非大部分地区枣椰树的一种严重叶螨害虫。鉴于对植绥螨类捕食者捕食东方小爪螨的情况了解甚少，作为了解其对东方小爪螨所有活动虫态有效性的第一步，在实验室条件（25、35°C和35±10%相对湿度）下，对从枣椰园采集的内盖夫钝绥螨Cydnoseius negevi（斯维尔斯基和阿米泰）和巴氏新小绥螨Neoseiulus barkeri休斯（蜱螨亚纲：植绥螨科）的生物学、捕食情况和生命表参数进行了研究。对于这两种捕食者，35°C时的产卵期明显短于25°C时。在25°C和35°C时，内盖夫钝绥螨和巴氏新小绥螨的以下参数分别为：雌螨寿命，31.8、20.1、35.7、27.4天；繁殖力，每雌螨21.6、38.0、18.8、34.8粒卵；产卵期，23.9、13.7、25.9、18.1天。内盖夫钝绥螨和巴氏新小绥螨雌螨在25°C和35°C时的总捕食量分别为246.0、270.0、227.6、205.3头猎物。观察到一些巴氏新小绥螨成年雌螨的肛门处附着有直肠栓，这常常导致螨类粘在表面。生命表参数估计为：内盖夫钝绥螨和巴氏新小绥螨在25°C和35°C时的净繁殖率（R0）分别为10.44、17.35、10.19、13.84，内禀增长率（rm）分别为0.14、0.19、0.13、0.16 d⁻¹，周限增长率（λ）分别为1.15、1.21、1.12、1.17 d⁻¹，世代时间（T）分别为17.03、15.17、17.83、16.61天，倍增时间（DT）分别为04.95、03.64、05.33、04.33天。在两种温度条件下，内盖夫钝绥螨的内禀增长率和净繁殖率值均高于巴氏新小绥螨。因此，可以得出结论，在内盖夫钝绥螨对东方小爪螨的防治效果优于巴氏新小绥螨，可被视为现有叶螨防治方法的一项有价值补充。
