Non-Chemical Methods for Controlling Seedborne Fungi in Carrot with Special Reference to Alternaria Radicina

Abstract

Abstract:The objective of the work was to study the efficacy of carrot seed treatment with antagonistic microorganisms Clonostachys rosea, C. solani, and grapefruit extract (Biosept 33 SL TM ). Seeds were artificially inoculated with Alternaria radicina spores prior to treatment. The presence of fungi, seed germination and vigour were determined in laboratory tests, whereas seedling emergence and health were determined in sand and soil assays. Clonostachys spp. and grapefruit extract significantly reduced seed infestation with A. radicina and improved seed germination capacity. At a lower concentration of ioculum, treatment with Clonostachys spp. increased percentage of healthy plants in sand assay. At a higher concentration of inoculum, treatment with Biosept 33 SL TM at 0.5% was more effective. Inoculation with pathogen and, in most cases, the following treatments, did not affect total plant emergence in a soil assay.However, pathogen affected significantly a percentage of healthy plants. Treatment with Biosept 33 SL TM at 0.5% as well as with C. rosea increased their numbers significantly at both concentrations of inoculum.

Plant Growth-Promoting Phoma spp.

“…Germination of seeds grown in soil inoculated with the rhizospheric fungi was increased. Suppression of seed-borne pathogens could be one of the involved mechanisms of increased germination by rhizospheric fungi (Szopińska et al 2010). Moreover, rhizospheric fungi may help to overcome and break seed dormancy (Delgado-Sánchez et al 2011).…”

Plant Extract Control of the Fungi Associated with Different Egyptian Wheat Cultivars Grains

“…In recent years much attention has been given to non-chemical systems for seed treatment to protect seeds against many plant pathogens (Begum et al 2009;Szopińska et al 2010;Perelló et al 2013). Antifungal activity of different plant extracts have been reported earlier by several investigators against a number of plant pathogens (Hassan et al 2005;Yang and Clausen 2007).…”

The evaluation of plant extracts, biocontrol agents and hot water as seed treatments to control black rot of rape in South Africa

“…Hence there is need for research on such alternative methods to control the pathogen including the use of hot water treatment, which is effective in reducing seed-borne inoculum (Forsberg et al, 2002) and controlling bacterial pathogens (Nega et al, 2003). Some plant extracts have been reported to be effective chemotherapeutants (Pawar, 2011) and they have the advantage of being biodegradable (van der Wolf et al, 2008;Szopinska et al, 2010). In addition, the use of antagonistic microorganisms such as Bacillus spp.…”