Incidence and management of white grub, Schizonycha ruficollis on seedlings of teak (Tectona grandis Linn. f.)
Incidence and management of white grub, Schizonycha ruficollis on seedlings of teak (Tectona grandis Linn. f.)
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柚木幼苗白蛴螬（Schizonycha ruficollis）的发病率和防治（Tectona grandis Linn. f.）
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
R. Singh
中科院分区：
文献类型：
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作者：
N. Kulkarni;K. Chandra;PRAFULLA NARAHAR Wagh;K. Joshi;R. Singh
2002 年至 2005 年，每年 5 月第二周至 9 月底，对印度那格浦尔 Ramdongari 柚木 (Tectona grandis L.f.) 苗圃中的圣甲虫 Schizonycha ruficollis (Fabricius) 的发病率进行了一项调查。未成熟阶段，即金龟子的白色幼虫，损害了苗床中 14%‐52% 的柚木幼苗，而该物种，即金龟子，除了报道的寄主如枣（Z. jujuba 和 Z. 毛里求斯）。季风前阵雨过后，S. ruficollis 甲虫开始从苗床中出现，并持续 10-18 天。虽然 S. ruficollis 甲虫使周围的树木寄主落叶，但该甲虫的未成熟阶段会以柚木幼苗的根系为食，造成严重损害，并在森林苗圃中出现枯萎和死亡的症状。对苗床赤颈蛴螬进行化学和生物处理的结果表明，10%甲拌磷颗粒剂20 g/m2和毒死蜱20%乳油5.0 mL/m2效果良好。 S. ruficollis 蛴螬以前没有被记录为柚木 (T. grandis) 的主要害虫。这也是首次报道红果小蠹成虫在木梨、儿茶和白毛小蠹等树寄主上出现。白蛴螬是具有重要经济意义的害虫，也是最难管理的害虫，本文提供的有关红蛴螬的发病率、害虫状况和管理的信息对于研究人员和森林苗圃管理者非常重要。
An investigation was conducted annually from 2002 to 2005 between the second week of May and the end of September on the incidence of scarab beetle, Schizonycha ruficollis (Fabricius) in a teak (Tectona grandis L.f.) nursery at Ramdongari, Nagpur, India. The immature stages, that is white grubs of the scarab beetle damaged 14%‐52% of teak seedlings in the nursery beds, whereas the adult of the species, that is scarab beetles, were recorded on three new host trees (Ziziphus xylopyra, Acacia catechu and A. leucophloea) in addition to the reported hosts such as ziziphus (Z. jujuba and Z. mauritiana). Beetles of the S. ruficollis started emerging from the nursery beds just after the pre‐monsoon showers and continued for 10‐18 days. While beetle of S. ruficollis defoliated tree hosts available in the surroundings, the immature stages of the beetle caused major damage by feeding on root systems of teak seedlings with symptoms of wilting and mortality in forest nursery beds. The result of chemical and biological treatments for the management of grubs of S. ruficollis in nursery beds indicated phorate 10% granular at the rate of 20 g/m2 and chlorpyriphos 20% emulsifiable concentrate at the rate of 5.0 mL/m2 to be effective. Grubs of S. ruficollis have not been recorded previously as a major pest of teak (T. grandis). This is also the first report on occurrence of S. ruficollis adults on tree hosts such as Z. xylopyra, A. catechu and A. leucophloea. White grubs being pests of economic importance and the toughest insects to manage, information given in this paper on incidence, pest status and management of Schizonycha ruficollis is of importance to researchers and forest nursery managers.