Biological management of root and collar rot (Rhizoctonia solani) of frenchbean (Phaseolus vulgaris).
2010
Bhagat, Someshwar | Pan, Stansu
Twelve isolates of Trichoderma were screened in vitro during 2006-08 against Rhizoctonia solani Kuhn. Causing root and collar rot of Frenchbean Phaseolus vulgaris L.) by dual culture tests and production of volatile and non-volatile antibiotics and it was found that all the isolate significantly inhibited the mycelial growth of Rhizoctonia solani. The isolate The AN-5 was most effective in suppression of mycelial growth of test pathogen, followed by TvAN-3, Thr An-7, ThrWB-1 and ThrWB2. TheAN-5 was most effective in view of percentage inhibition of mycelial growth of R. solani (73.8 and 83.9%) by production of non-volatile substance at variable concentrations (7.5 and 15.0% respectively). Highest per cent germination (91.0%) vigour index (1287.0) and seedling biomass (772.5 mg) of Frenchbean seeds were recorded when the seeds were primed with TvAN-5 followed by ThrAn-5 and TheWB-1. The bacterial antagonist Ps. Fluorescens was also very effective in inducing germination behaviors of Frenchbean seeds. The collar rot of Frenchbean (c.o.-R solani) was most effective controlled in greenhouse test by seed and soil application of TheWB-1 (79.0%), followed by ThrAn-5 and ThrAN-5 (78.2% each), TvAN-3 (77.6%) while the isolate TvAN-10 was the least effective isolate with only 67.4% reduction in disease incidence. The highest germination (%), per cent reduction in disease incidence and increase in green pod yield of Frenchbean was recorded with combination of seed and soil application of ThrWB-1 (348.2%) over control under R. solani sick field condition, followed by T1 (TvAN-5, 345.8%), T6 (ThrAN-5, 343.4), T12 (TvAN-3,339.7%) while lowest (239.7%) increase in yield was noted seed application of TvAN-10 (T16 treatment).
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