S. Kumar , Sushil Sharma

Abstract

The epidemiological factors viz. inoculum density, inoculum age, inoculum depth and soil moisture affected the ischolar_main rot development in Jatropha. The inoculum density of 20 g kg^-1 soil resulted in 42.22 per cent pre emergence mortality (PEM) and 23.15 per cent post emergence mortality (POEM). The highest PEM (37.78 %) and POEM (21.48 %) were recorded in five days old culture. Inoculum depth at 5 cm induced 42.22 per cent and 30.55 per cent PEM and POEM, respectively. Irrigation schedule at 20 days interval showed maximum PEM (41.66 %) and POEM (34.92 %).

Keywords

Root Rot, Jatropha curcas, Rhizoctonia bataticola, Inoculum, Soil Moisture

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G. S. Shamet , S. Kumar

Abstract

Exogenous application of auxins promoted ischolar_main formation in cuttings taken from one-year old branches of Punica granatum and Dalbergia sissoo under controlled conditions. All the concentrations of IBA, 10,000 and 15,000 mg/l of IAA and 2,000 mg/l of NAA were most effective when applied as quick dip method. Auxins not only enhanced ischolar_main formation but also increased the number of ischolar_mains per cutting and average ischolar_main length.

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S. Kumar , Sushil Sharma , H. S. Saharan , R. P. Deswal

Abstract

The ischolar_main rot of Jatropha caused by Rhizoctonia bataticola is an important disease. An experiment was conducted invitroand in vivoto evaluate the effect of plant growth promoting bacteria against R. bataticola. The study revealed that Pseudomonas fluorescens caused the maximum growth inhibition (48.9%) followed by Pseudomonas maltophilia (46.7%) and Bacillus subtilis (38.9%). The seed germination percentage improved substantially in all the treatments involving PGPRs. Among different co-inoculations of PGPRs and pathogen, minimum pre-emergence mortality (31.1%) and post-emergence mortality (9.7%) and maximum seedling survival (40.78%)was observed with P. fluorescens.

Keywords

Root Rot, Rhizoctonia Bataticola, Growth Inhibition, Germination Percentage

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