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Compost suppressiveness against Phytophthora capsicion pepper in potting trials

Suppression of soil-borne plant diseases with composts has been widely studied. Composts suppressive to soil-borne pathogens have been detected in various cropping systems. Vegetable plants are generally propagated in pots, allowing the use of suppressive substrates to control zoospore-producing pathogens, like Phytophthora sp. The objective of the present work was to assess compost suppressiveness against Phytophthora capsici on pepper (cv. Corno di Toro). A municipal compost showing a good…

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Suppression of soil-borne plant diseases with composts has been widely studied. Composts suppressive to soil-borne pathogens have been detected in various cropping systems. Vegetable plants are generally propagated in pots, allowing the use of suppressive substrates to control zoospore-producing pathogens, like Phytophthora sp. The objective of the present work was to assess compost suppressiveness against Phytophthora capsici on pepper (cv. Corno di Toro). A municipal compost showing a good suppressive activity in previous trials on vegetable crops was used. Compost was mixed at 10, 20, 40, 60, 80 and 100% (v/v) with a commercial peat substrate, used as control. Substrates have been inoculated at 0.25, 0.5 and 1 g/l with wheat and hemp kernels infested with P. capsici and after one week 10 plants were transplanted for each treatment in 4 trays of 10 liters volume capacity and placed in greenhouse at 20 degrees C. Diseased plants were assessed weekly after transplanting and above-ground biomass of plants was assessed at the end of the trials. Compost applied at 80% significantly controlled the disease at high inoculum density (1 g/l), while at lower inoculums density, 0.25 and 0.5 g/l, reduced compost applications, 40% and 60% respectively, were sufficient to significantly control the disease. The application of compost at 20%, in absence of the pathogen, increased the biomass of pepper plants compared to control. The use of compost based substrates can be a suitable strategy for controlling soil-borne diseases on pepper, but results depends on application rates.

Source: https://pubmed.ncbi.nlm.nih.gov/25151829/?utm_source=no_user_agent&utm_medium=rss&utm_campaign=pubmed-2&utm_content=1XAOX_jnjTyCUo06Xbq0lslwi760CIxcWfQx0n9x5BPH5yV1sN&fc=20200804212910&ff=20200812123253&v=2.11.5

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