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首页> 外文会议>Workshop of the Australian Centre for International Agricultural Research >Influence of management practices in rainfed rice ecosystems on the incidence of rice brown planthopper (Nilaparvata lugens) in PNG
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Influence of management practices in rainfed rice ecosystems on the incidence of rice brown planthopper (Nilaparvata lugens) in PNG

机译：管理实践对雨稻生态系统对PNG水稻褐色Planthopper（Nilaparvata Lugens）发病率的影响

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Studies were conducted to quantify the population dynamics of rice brown planthopper (BPH) Nilaparvata lugens Stal (Homoptera: Delphacidae) and its natural predators--mirid bugs Cyrtorhinus lividipennis Reut. and C chinensis Stal (Hemiptera: Miridae) and predatory spiders (Aranae)--under naturally infested rainfed conditions in Morobe Province, PNG. Populations of BPH and natural predators were monitored on 21 varieties of upland and irrigated rice, to quantify population dynamics and host-plant resistance levels in a series of field-based experiments during the 1997 and 1998 seasons. All but one of the experiments were maintained insecticide-free. Host-plant resistance to BPH and insecticide application influenced population levels of BPH and natural predators. On moderate to highly resistant varieties, BPH and natural predator populations were relatively low in both insecticide-treated and insecticide-free situations. On susceptible varieties, both BPH and natural predator populations were relatively high in the absence of insecticide treatment. Populations of Cyrtorhinus spp. were reduced in insecticide-treated plots, allowing an insecticide-induced resurgence of BPH populations on susceptible varieties. The study showed the need for screening against BPH of both upland and irrigated rice varieties in PNG and for further investigations into the influence of natural predators on BPH population dynamics in a range of cropping systems. The effects of insecticide-induced BPH resurgence should also be investigated while the PNG government continues with its vision of reducing rice imports by developing largescale rice production in the country.
机译：进行了研究，以量化褐飞虱种群动态（BPH）褐飞虱（同翅目：飞虱科）和它的天敌 - mirid错误黑肩绿盲较不安全Reut。和C羊草飞虱（半翅目：盲蝽科）和食肉蜘蛛（Aranae） - 在莫雷贝省，PNG自然出没的雨养条件下。 BPH和天敌的种群数量在21个品种高地和灌溉稻进行了监测，在1997年和1998年赛季，以量化人口动态和寄主植物抗性水平的一系列基于现场的实验。所有但一个实验中均保持杀虫剂免费。褐飞虱和褐飞虱和天敌的农药使用影响人口水平寄主植物抗性。在中度至高度抗病品种，BPH和天敌种群在两种杀虫剂处理过的和无杀虫剂的情况下相对较低。上感病品种，既BPH和天敌种群相对较高在没有杀虫剂处理的。黑肩绿盲属种群。在杀虫剂处理过的样地减小，允许在感病品种BPH种群的杀虫剂诱导的回潮。研究表明，有必要筛选针对PNG两个高地和灌溉水稻品种的BPH和进一步调查天敌对褐飞虱种群动态范围耕作制度的影响。杀虫剂引起的BPH复苏的影响也应当同时巴新政府，其通过发展大规模水稻生产在全国减少大米进口的眼光继续调查。

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