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Field studies on the effectiveness of phosphonate suppression of Phytophthora root rot in proteas

机译:膦酸盐抑制蛋白酶对疫霉根腐病有效性的田间研究

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摘要

Phosphonate suppression of root rot in proteas, caused by P. cinnamoni, was tested in field trials in Queensland, Australia, over a 2-year period (1990-92). Effectiveness of chemical control varied, dependent upon plant species, site topography, soil moisture content and soil temp. Phosphonate, applied as foliar spray at 1.2 g a.i./litre at 6-weekly intervals, resulted in 100% plant survival (compared with 19% in unsprayed control plants) in Leucadendron cv. Sylvan Red and 75% survival in Leucospermum cv. Firewheel (compared with 44% in unsprayed plants). Under site conditions conducive to high disease pressure, increased spraying intensity (3-weekly, 2.3 g a.i./litre) did not prevent infection (81% of plants) and death (50%) of Leucospermum cv. Firewheel by P. cinnamoni.
机译:在两年的时间里(1990-92年)在澳大利亚昆士兰州进行了田间试验,测试了由肉桂肉桂杆菌引起的蛋白酶对蛋白酶对根腐病的抑制作用。化学控制的效果取决于植物种类,现场地形,土壤含水量和土壤温度而变化。以每6周一次的间隔以1.2 g a.i./升的叶面喷施膦酸盐,在Leucadendron cv中可实现100%的植物存活率(未喷雾的对照植物为19%)。 Sylvan Red和Leucospermum cv中的75%存活率。火轮(相比之下,未喷洒的植物为44%)。在有利于高病害压力的现场条件下,增加喷洒强度(每周3次,每升2.3 g a.i.)并不能预防Leucospermum cv的感染(占植物的81%)和死亡(占50%)。火轮由肉桂。

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