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花生叶斑病(黑斑病、褐斑病)是一个世界性的病害。在花生生长中后期为害叶、茎、果针,招致叶、茎早枯,叶片大批脱落,造成秕果,轻者减产10%,重者减产30%以上。此病多发生在花生生长后期,易被群众误为成熟期的征状,未引起重视。1978年我所试用药剂防治叶斑病,取得了较好效果。从附表看,托布津防治花生叶斑病,以0.5—0.6∶2000倍浓度较好,我们是7月中下旬开始进行防治,在第一次喷药后,每隔20天左右连续喷洒1—2次,可使发病率降低,花生增产10—24%之间。另外,还要掌握发病火候,及时喷药比单纯增加浓度效果显著,喷药时应选择无风天气,不断搅拌药液,自上而下地均匀喷洒。
Peanut leaf spot (black spot, brown spot) is a worldwide disease. In the late peanut growth damage leaves, stems, fruit needles, leading to leaves, stems early blight, leaves a large number of off, resulting in cuttings, light production cut 10%, heavy cut more than 30%. The disease occurs in the late peanut growth, easy to be misunderstood as a sign of maturity, did not pay attention. In 1978, I tried to prevent leaf spot disease and achieved good results. From the table, Topsoe control peanut leaf spot to 0.5-0.6: 2000 times better concentration, we are beginning in mid-July to prevent and control, after the first spraying, continuous spraying every 20 days 1 -2 times, can reduce the incidence of peanut 10-24% increase between. In addition, but also master the incidence of fire, timely spraying than simply increasing the concentration effect is significant, spraying should be free of windy weather, constantly stirring the liquid, spraying evenly from top to bottom.