By Mukesh K. Meghvansi, Ajit Varma
This e-book offers a well timed evaluation of ideas in plant illness administration regarding microbial soil suppressiveness and natural amendments.
Topics mentioned contain the impression of suppressive soils on plant pathogens and agricultural productiveness, the enhancement of soil suppressiveness throughout the software of compost and the improvement of sickness suppressive soils via agronomic administration. extra chapters describe ailments because of phytopathogens, reminiscent of Pythium, Fusarium and Rhizoctonia, interplay of rhizobia with soil suppressiveness elements, biocontrol of plant parasitic nematodes by means of fungi and soil suppressive microorganisms.
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Additional info for Organic Amendments and Soil Suppressiveness in Plant Disease Management
Furthermore, the low availability of Fe can induce siderophore production and microbial competition for Fe (Alabouvette 1999). Fusarium wilt severity tends to be higher at substrate pH values of 5–7, which are most favourable for the growth and survival of pathogenic Fusarium species (Oritsejafor 1986). 5) reduced sporangium formation, zoospore release and motility of Phytophthora cinnamomi, a causal agent of root rot and dieback in many plant species. 5 has been used as a substrate or substrate component to suppress Phytophthora, Rhizoctonia and Pythium root rot diseases (Spring et al.
2008; Sang et al. 2010). Microbes present in compost and compost tea or extracts have been reported to induce plant host defences in the presence of soilborne and foliar pathogens (Zhang et al. 1998; Wei et al. 1991). Such inductions, which are described as being local and/or systemic in nature, are dependent on the type, source and amount of stimuli (Keen 1990). In this regard, two forms of induced plant resistance have been identified: systemic acquired resistance (SAR) and induced systemic resistance (ISR).
Similar findings have been reported for compost tea or extracts and microorganisms isolated from compost. For example, based on the increased concentration of inducible resistance-related compounds including peroxidase, phenol oxidase and phenylalanine ammonia lyase activities, Siddiqui et al. (2008) concluded that induced host resistance was stimulated in okra plants treated with non-sterilised and filter-sterilised compost teas. Likewise, Sang and Kim (2011) attributed the suppressive-effect compost-water extract against anthracnose in cucumber and pepper to a compost mediated ISR property.