Abstract
Three bioagents (Trichoderma viride, T. harzianum and Gliocladium virens) and five biopesticides (Achook, Neemgold, Wannis, Spictaf and Neemazal) were evaluated under in vitro and in vivo conditions against Colletotrichum lindemuthianum. All the three antagonistic fungi caused significant inhibition of mycelial growth, maximum being with T. viride (69.21%) followed by T. harzianum (64.20%). Among the biopesticides tested at four concentrations, Wanis applied @ 1000 ?l/ml caused maximum inhibition of 82.12 per cent followed by Spictaf (52.85%). T. viride and Wanis @ 1000 ?l/ml were most effective in reducing the seed borne infection. Integration of bioagents with Bavistin showed that disease can be effectively managed with seed dressing either with Bavistin or biopesticide followed by foliar treatment with fungicide or biopesticide.
Highlights
Bean anthracnose caused by Colletotrichum lindemuthianum (Sacc. and Magn.) Bri and Cav. is a cosmopolitan seed borne disease
Antagonistic activity of three bioagents (Trichoderma viride, T. harzianum and Gliocladium virens) and five neem based biopesticides (Achook, Neemazal, Neemgold, Spictaf and Wanis) against C. lindemuthianum in dual culture and poisoned food technique is presented in Fig
Maximum inhibition of mycelial growth was obtained with T. viride (69.21%) followed by T. harzianum (64.20%) though both were statistically at par with each other
Summary
Bean anthracnose caused by Colletotrichum lindemuthianum (Sacc. and Magn.) Bri and Cav. is a cosmopolitan seed borne disease. Bavistin being highly effective against the anthracnose is mostly used both for seed treatment and foliar sprays in high rainfall conditions which could create problem of fungicidal resistance in the pathogen in due course of time, it is important to find out an alternative to avoid this risk. The presence of naturally occurring microorganisms with antifungal property has been well recognized and documented, but very few of them have been studied extensively in case of bean anthracnose. These bioagents have been tested against an array of Colletotrichum species infecting many commercially important crop plants (Singh, 1985; Silva and Pascholati, 1992). In the present study, biocontrol agents, biopesticides along with fungicide (Bavistin) were evaluated under in vitro conditions and their integration was studied under in vivo to evolve an effective management strategy
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