Pests and diseases are two of the limiting factors in shallotscultivation in the lowland areas. To overcome pest and disease problems, shallots farmers generally use pesticides intensively. Thesecircumstances led the increase of production costs and the inefficient on shallots cultivation. One effort to reduce using pesticide useis by applying the control threshold of pests and diseases. The experiment of the control threshold of pests and diseases on shallotscultivation was carried out in Kersana Subdistrict, Brebes District, Central Java (± 5 m asl.) in April until July 2009. This experimentaimed to determine the effect of control threshold on reduction of using pesticide. Two kind of treatments were applied, namely(A) the use of control threshold (Spodoptera exigua, Liriomyza sp., and Alternaria porri) compared with (B) with the calendarsystem via application of pesticides every 3 days. The study was conducted using paired comparison method and each treatment wasrepeated six times. Treatment plot size was 37.5 m2. The shallots variety planted was Bima Curut. The result showed that the controlthreshold could reduce insecticide and fungicide application by 43.75 and 87.50% respectively; spraying volume 52.83% with yieldremain high (36.40 t/ha). Implementation of the control threshold, was economically feasible to be adopted because it can increasenet revenues and reduce costs of pesticide compared with the calendar system of pests control, routinely applied every 3 days.
展开▼
机译：害虫和疾病是低地青葱栽培中的两个限制因素。为了克服病虫害问题，青葱农户通常大量使用农药。这些情况导致了生产成本的增加和青葱的种植效率低下。通过应用病虫害控制阈值来减少农药使用的一项努力。 2009年4月至2009年7月，在中爪哇省布雷布斯（±5 m asl。）的Kersana街道进行了病虫害防治阈值试验。农药。采用两种处理方法，即（A）与对照（B）相比，每三天使用一次农药，使用控制阈值（Spodoptera exigua，Liriomyza sp。和Porternaria porri）。该研究采用配对比较法进行，每次治疗重复六次。处理地块面积为37.5平方米。种植的青葱品种是Bima Curut。结果表明，控制阈值可分别减少43.75％和87.50％的杀虫剂和杀真菌剂施用。喷施量为52.83％，产量仍然很高（36.40吨/公顷）。实施控制阈值在经济上是可行的，因为与通常每三天使用一次的害虫控制日历系统相比，它可以增加净收入并降低农药成本。
展开▼
