PGPR are the major root colonizers, belong to different genera and most reported strains are from species of Pseudomonas, Bacillus and Serratia. The strains of PGPR are known to survive both in rhizosphere and phyllosphere. Several Pseudomonas strains have been shown to activate ISR in plants against many fungal, bacterial and viral diseases. In response to this, biofungicides, derived either from microbes or plants, emerged as promising alternative strategies. Neem (Azadirachta indica), garlic (Allium sativum), onion (Allium cepa) and few other plants inhibit early blight in potato and tomato. Leaf extracts of Prosopis juliflora and Cocos nucifera inhibited proliferation of spores of Alternaria. Solani above 90%.
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