Vol. 10, Issue 12 (2021)

Author(s):
Varsha Soni and SK Arsia

Abstract:
Tomato (Lycopersicon esculentum Mill) is one of the most important vegetable crop which belongs to solanaceae family and is known as protective food because of its special nutritive value and wide spread production. Early blight is hugely occurred and devastating disease of tomato plant which incited by Alternaria solani. The anti pathogenic activity of five plants extracts viz., Neem oil, Harad powder, Sanay powder, Castor oil and Aonla powder were tested against early blight of tomato incited by A. solani inhibited the mycelial growth, inhibition increased with increased concentration of botanicals. Significantly minimum growth was noticed at 20 per cent concentration followed by 15 per cent and 10 per cent. Among the botanicals minimum growth were obtained with Neem oil followed by Harad powder, Sanay powder, Castor oil and Aonla powder as compared to control. PDI of early blight was recorded periodically from 45 to 105 days after planting (DAP) with an interval of 15 days. The per cent disease severity in different treatments at 105 days after planting (DAP) evaluated that minimum disease severity (14.56%) with 73.08% PDI reduction and increased yield 82.03% was recorded in Neem oil treated plot which was at par with Harad powder (20.10%) with 62.83% PDI reduction and yield increased 64.44% both treatments were followed by Sanay powder, Castor oil and Aonla powder treated treatments respectively with PDI of 25.66%, 29.82% and 32.06%.