D. Dinakaran ¹, T. Marimuthu ²

Affiliations
1 Regional Research Station, Tamil Nadu Agricultural University, Vriddhachalam 606001, Tamil Nadu, IN
2 Tamil Nadu Rice Research Institute, Aduthurai 612 101, IN

Abstract

Nine mutants of Trichoderma viride Pers. ex Fr. obtained by using different mutagenic agents were evaluated for their relative efficacy against Macrophomina phaseolina (Tassi.) Goid in terms of antibiotic production. The cell free culture filtrate of mutant M 1 showed the highestin vitro inhibition of mycelial growth (54.4%) and sclerotial germination (75.8%) of M. phaseolina followed by M3 and they were on par with each other. The mutants M3 and M8 produced maximum volatiles in vitro as evidenced by the retardation in growth of M. phaseolina which registered a growth of 10 mm after 48 h of incubation while in control the growth was 90 mm.

Keywords

Antibiosis, Macrophomina phaseolina, Non-Volatiles, Trichoderma viride Mutants, Volatiles.

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T. Marimuthu ¹

Affiliations
1 Department of Plant Pathology, Tamil Nadu Agricultural University, Coimbatore - 641 003, IN

Abstract

Seedvine rot is one of the major problems of betelvine cultivation. Dipping of betelvine seedvine in Azospirillum suspension before planting resulted in 100 per cent ischolar_maining in 14 days of planting and reduced the seedvine rot by 84 per cent under field conditions. The association of Azospirillum with the ischolar_mains of betelvine is established.

Keywords

Piper betle, Azospirillum, Seedvine Rot.

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