Abstract
The present study was conducted at Tej Narayan Banaili College, T.M. Bhagalpur University, Bhagalpur, Bihar during 2015-2017 to evaluate the efficacy of 8 medicinal plants viz. Datura stramonium (datura), Curcuma longa (turmeric), Azadirachta indica (neem), Zingiber officinale (ginger), Allium sativum (garlic), Ocimum sanctum (tulsi), Nyctanthus arbortristis (harsringar) and Piper betle (betel/paan) and 4 bioagents viz. Trichoderma harzianum, T. viride, Gliocladium virens and Chaetomium globosum against Colletotrichum gloeosporioides (Penz.) Penz. & Sacc., an incitant of fruit rot disease of guava (Psidium guajava Linn.). A maximum inhibition of mycelial growth of pathogen was recorded in garlic clove extract (80%) followed by betel leaf extract (76%), turmeric rhizome extract (74%), neem leaf extract (70%) and ginger rhizome extract (64%). Harsringar leaf extract was found as the least effective (56%). In pre-and post-inoculation tests, all the phytoextracts were found significantly superior in reducing Colletotrichum rot severity on 7 days after treatments as compared to control. Garlic clove extract again proved highly effective in reducing fruit rot severity after 7 days after inoculation in both pre - and post - inoculation treatments. In vitro dual culture experiments, maximum growth inhibition was recorded with T. viride (76.5%) followed by G. virens (72.2%), T. harzianum (67.6%) and least inhibition by C. globosum (44.7%) In both pre - and post- inoculation treatments with antagonists, maximum DRI (disease reduction index) was noticed with C. globosum (69.2 and 62.4%) followed by T. harzianum (51.9 and 56.7%), G. virens (44.8 and 46.9%) and least with T. viride (38.1 and 35.4%). The rot incidence at 8 DAI (days after inoculation) was significantly higher than that at 4 DAI. The hot water fruit dip treatment at 50OC for 5 min was found best for controlling the rot without hampering the fruit quality.
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