丙环唑防治橡胶树红根病田间试验

以海南橡胶树发生较严重的红根病为防治对象,采取田间大田试验的方法,用w=25％的丙环唑乳油和w=25％的丙环唑水乳剂进行防治,研究丙环唑对橡胶树红根病的防治效果和明确哪种剂型对橡胶红根病的防治更有效.结果表明,经DMRT法进行显著性测定,说明参试剂型对橡胶红根病的防治均有一定的防治效果.其中,w=25％的丙环唑乳油200倍液和400倍液对橡胶树红根病的防治效果最明显,其在第2次施药后,用w=25％的丙环唑乳油200倍液处理的病株率为15.00％,防治效果为78.57％,w=25％的丙环唑乳油400倍液病株率为15.83％,防治效果为77.83％,而w=25％的丙环唑水乳剂200倍液病株率为24.17％,防治效果为65.47％.从上述结果看,w=25％的丙环唑乳油和w=25％的丙环唑水乳剂对已感染红根病的橡胶树具有很好的防治效果,且在本试验使用浓度范围内对橡胶树安全.经示范后可在生产上推广应用,宜于发病初期,使用浓度为200 ～ 400倍液.

Control of Rubber Red Root Disease (Ganoderma pseudoferreum) with Propiconazole in the Field

Red root rot （ Ganoderma pseudoferreum） is one of the major root diseases infecting rubber tree in Hainan. A field trial was arranged to control the red root rot of rubber tree with propiconazole 25% EC and 25% EW at different concentrations. The results showed that both propiconazole formulations had a good control of this disease. The propiconazole 25% EC gave higher control effect than the propiconazole 25% EW. The rubber root rot is well controlled with both formulations of propiconazole after three rounds of application. Of all the concentrations tested, propiconazole 25% EW diluted at 1 ： 200 - 400 gave the best control of the red root rot with a control efficiency of more than 90%.