Vikram Varun, Hemant Kumar Singh, H.K. Singh, Jitendra Kumar, Shubham Patel and Pathan Maha Jabeen
Abstract
Aonla (Emblica officinalis Gaertn.), commonly known as Indian gooseberry, is an important indigenous fruit of India belonging to the family Euphorbiaceae and order Euphorbiales. During the rabi season of 2025-26, an investigation was carried out at the Main Experimental Station, ANDUAT, Kumarganj, Ayodhya to evaluate the resistance of fifteen commercial cultivars/germplasm against Ravenelia emblicae Styd. Under natural field conditions. Fifteen commercial cultivars/ germplasm of aonla were screened during Rabi season in the year 2025-26. The screening of aonla varieties revealed a wide variation in disease intensity, ranging from 3.77% to 31.00%. Varieties NA29 and Chakaiya exhibited the highest levels of infection (31.00% and 26.17%, respectively), with early onset of disease on 27 September, classifying them as highly susceptible. A group of varieties including NA25, NA6, NA20, NA5, NA4, NA10, NA32, NA7, and NA26 showed intermediate disease intensity (11.37-22.87%), and were categorized as moderately susceptible. However, Anand1, NA27, and Francis recorded comparatively lower disease intensity (6.25-8.96%), indicating moderate resistance. The variety BSR1 displayed the lowest disease intensity (3.77%), with delayed infection appearing on 17 December, and was therefore classified as resistant to soft rot of aonla. AUDPC, calculated for the 15 germplasms on the basis of disease intensity, varied from 282.50 (BSR-1) to 2324.75 (NA-29), indicating rapid disease progression across all germplasms. The highest rate of infection (1.8268) was observed in NA-7, followed by Anand-1 (1.5256). However, the minimum infection rate (0.9129) was recorded in both NA-20 and Chakaiya. These findings provide a comprehensive account of the screening of resistances causal organism associated with soft rot of aonla.