Journal of Applied Horticulture. 2000: 2(2): 111-112

Control of aonla (Emblica officinalis Gaertn.) rust through fungicides

Pradeep Kumar; Singh, H K

Department of Horticulture, Narendra Deva University of Agriculture & Technology, Kumarganj, Faizabad - 224 229 (U.P.), India.

Field experiments were conducted in 1995-96, 1996-97, and 1997-98 at Faizabad, Uttar Pradesh, India, with aonla (Emblica officinalis [Phyllanthus emblica]) cultivars NA-7 and Kanchan to determine the effective fungicides against aonla rust (caused by Ravenelia emblicae). Pooled data revealed that all tested fungicides, except tridemorph, reduced the rust percent disease index (PDI; 0.69-16.83 and 1.17-14.04) over the control (25.45 and 17.65) in NA-7 and Kanchan, respectively. Indofil M-45 (mancozeb; 0.3%) applied thrice during September-October was most effective (0.69 and 1.17 PDI; 97.37 and 93.22 percent disease control or PDC), followed by Baycor (bitertanol; 3.22 and 6.34 PDI; 84.79 and 67.46 PDC) and Blitox-50 (copper oxychloride; 3.55 and 7.13 PDI; 84.69 and 62.22 PDC). Improvement in fruit size was also recorded for these fungicides. Tridemorph showed toxic effects by causing heavy premature fruit drop. NA-7 was most sensitive as there were less healthy fruits left for recording the yield.