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首页> 外文期刊>Journal of Biological Control >Influence of Soil pH and Moisture on the Biocontrol Potential of Trichoderma harzianum on Phytophthora capsici-black Pepper System
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Influence of Soil pH and Moisture on the Biocontrol Potential of Trichoderma harzianum on Phytophthora capsici-black Pepper System

机译：土壤pH和水分对哈茨木霉在辣椒疫霉-黑胡椒系统上的生防潜力的影响

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摘要

The role of abiotic factors in maintaining the population and proliferation of Trichoderma harzianum (Rifai) with respect to the survival and multiplication of Phytophthora capsici in black pepper system was studied in conducive soil under pot culture conditions. Trichoderma harzianum could grow profusely at a pH range of 4.0-5.0, while P. capsici could grow better at pH 5.5-6.0. Trichoderma harzianum survived and proliferated in soil at a pH range of 4.5-5.5 with 10-15% moisture level. P. capsici survived at a pH range of 4.5-7.0, but its multiplication was at higher pH levels (6.6-7.0) as indicated by the disease potential index and it was also found capable of surviving at all moisture levels tested. When Phytophthora infested soil was supplemented with Trichoderma, a disease reduction of 27.5-63.75% was noticed in 20 days application compared to soil without Trichoderma supplement. Hence for the biological control of P. capsici in black pepper system, the pH of the soil has to be maintained after at 4.5-6.0 in order to facilitate the growth and proliferation of Trichoderma which in turn will reduce the population of Phytophthora.
机译：在盆栽条件下的有利土壤上，研究了非生物因子在维持黑胡椒木霉菌的存活和繁殖方面维持哈茨木霉（Rifai）种群和增殖的作用。哈氏木霉可以在4.0-5.0的pH范围内大量生长，而辣椒衣壳在pH 5.5-6.0的条件下可以生长得更好。哈氏木霉在pH范围为4.5-5.5，水分含量为10-15％的土壤中存活和繁殖。辣椒疫霉可以在4.5-7.0的pH范围内存活，但如疾病潜在指数所示，它的繁殖在较高的pH值（6.6-7.0）上，并且还发现它能够在所有测试的水分含量下存活。当疫病土壤中添加木霉菌后，与未添加木霉菌的土壤相比，施用20天后病害减少了27.5-63.75％。因此，为了对黑胡椒系统中的辣椒辣椒进行生物防治，必须将土壤的pH值保持在4.5-6.0之后，以促进木霉的生长和繁殖，从而减少疫霉菌的种群。

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