Abstract
Efficacy of antagonists isolated from rhizosphere was tested against different isolates of Macrophomina phaseolina collected from groundnut growing areas of Rajasthan and adjoining states. One isolate of Trichoderma harzianum, one isolate of Trichoderma viride and one isolate of Bacillus subtilis gave distinct antagonistic reactions against all the isolates of M. phaseolina in dual culture plate method. T. viride, T. harzianum and Bacillus sp. minimized root rot incidence in groundnut up to 73.34, 66.67 and 53.34%, respectively, when compared to control where 100% mortality was observed in pots. T. viride was most effective with organic amendments followed by T. harzianum and B. subtilis. T. viride along with neem (Azadirachta indica) cake minimized the disease up to 73.58% under field conditions. Key words: Antagonists, biocontrol, groundnut, Macrophomina phaseolina, organic amendments.
Highlights
Evalluation n of an ntagonists ag gainst Macro ophomina phase p olina causin c g roott rot off groun ndnut
Efficacy of antagonists isolated from m rhizosphe ere was teste ed against different isolates of Macro ophomina phaseolina collected frrom groundn nut growing areas of Ra ajasthan and d adjoining s states
Microorganisms isolated during the course of studies were tested for antagonism to M. phaseolina. The microorganisms having such properties were utilized for possible biological control of groundnut root rot by addition of the cultures of antagonists to infested soil along with certain organic amendments
Summary
Evalluation n of an ntagonists ag gainst Macro ophomina phase p olina causin c g roott rot off groun ndnut. The microorganisms having such properties were utilized for possible biological control of groundnut root rot by addition of the cultures of antagonists to infested soil along with certain organic amendments. M. phaseolina (Mp) was isolated from infected roots of groundnut plants on potato dextrose agar (PDA) plates and incubated at 28°C
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