| 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. |
