Abstract
The present study was carried out to evaluate the effect of different oils (lemongrass, neem, karanj, zinger, eucalyptus and patchouli oils), different plant product extracts (garlic, zinger, false ashoka and datura) and different antagonistic microorganisms (different species of Trichoderma spp., Bacillus sp. and Pseudomonas sp.) on grey blight of tea, Pestalotiopsis theae. Results reveal that eucalyptus oil and neem oil (0.05%) showed 98.1 and 94.3% inhibition of mycelial growth over the control, respectively. Although, both of them at 0.1% showed 100% inhibition for the pathogen. Similarly, plant extract garlic and datura showed 98.2 and 95.4% inhibition of mycelial growth over control. Among the different antagonistic agents, Trichoderma viride showed 74.3% inhibition of mycellial growth over the control. Among chemical fungicide, bavistin showed 100% inhibition over control. The various antifungal extracts showed inhibitory/fungicidal effect against grey blight of tea. These could serve as sources for development of new antifungal agent. Key words: Plant products, antagonistic microorganism, grey blight of tea, mycelial growth.
Highlights
Many farmers do not use synthetic pesticides, and some consumers will only buy organic produce
The present study was carried out to evaluate the effect of different oils, different plant product extracts and different antagonistic microorganisms on grey blight of tea, Pestalotiopsis theae
Results reveal that eucalyptus oil and neem oil (0.05%) showed 98.1 and 94.3% inhibition of mycelial growth over the control, respectively
Summary
Many farmers do not use synthetic pesticides, and some consumers will only buy organic produce. Plant based products has been used for many centuries among limited resource farmers in developing countries to control insect pests of both field crops and stored produce, but their potential was initially limited and ignored (Chowdhury et al, 2003). Essential oils are natural antidepressants, antibacterial fighters and immune strengtheners It is a major group of agro-based industry products. Insect-pests like plants, can be infected by disease-causing organisms such as bacteria, viruses and fungi. Under some conditions, these naturally occurring organisms multiply quickly to cause disease outbreaks or epizootics that can decimate an insect population. The application of broadspectrum chemical fungicides is the common practice in most of the horticultural crops for controlling fungal diseases. It is likely that the results will broaden the scientific base upon which total control of the fungal diseases of tea may be established through eco-friendly disease management programmes
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
