Evaluation of Botanicals and Bioagents against Phytophthora Root Rot in Citrus

An experiment was conducted in which different combinations of botanicals viz., Neem, Tulsi, Onion, Garlic, and Chrysanthemum and bioagents were used under in vitro and green house conditions for reducing the intensity of Phytophthora root rot. The bioagent Trichoderma viride gave highest growth inhibition (75.33%) of Phytophthoraparasitica by dual culture method. In poisoned food technique complete inhibition of Phytophthora parasitica was recorded in Garlic (5%), whereas Tulsi found to be less effective to inhibit the growth of P. parasitica (54.44%). Under green house experiment combined application of Trichoderma viride @ 4g/kg + Garlic clove extract @ 5% reduced per cent root rot incidence (11.32%). Similar treatment showed maximum shoot and root length (4.5cm, 5.96cm) ofCitrus jambhiri.