Vol. 12, Issue 12 (2023)

Author(s):
Suthar YM, Prajapati HN, Barad AH and Desai SG

Abstract:
Of all the agricultural pests and diseases that feared citrus crops, citrus canker is one of the most devastating. The disease, caused by the bacterium Xanthomonas axonopodis pv. citri, distributed worldwide including India. The initial symptoms appeared on leaves in the form of lesions as dark green and later become thickened brown and corky which become raised and blister-like, growing into white or yellow spongy pustules. In present study, bacteria was isolated on Nutrient agar medium from infected leaves and fruits collected from Horticultural farm, College of Horticulture, AAU, Anand which showed yellow, circular and mucoid colony. Purification of bacteria was done by using streak plate method. In-vitro efficacy of different agrochemicals and medicinal plant extracts were assessed using Agar-well diffusion method. Among ten tested agrochemicals, streptomycin sulphate 90% + tetracycline hydrochloride 10% SP mixed with copper oxychloride 50% WP showed highest zone of inhibition with all three concentration (100, 200 and 300 ppm) 20.28 mm, 22.62 mm and 26.08 mm with percent inhibition of 22.54, 25.13 and 28.97. Among medicinal plant extracts, highest zone of inhibition (7.91 and 12.20 mm) was recorded with treatment Neem with percent inhibition of 8.78 and 13.55 percent.