PJB-2012-271
INCIDENCE AND CHEMICAL CONTROL OF OKRA LEAF SPOT DISEASE
A. R. ARAIN1*, M. MITHAL JISKANI2, K.H. WAGAN2, S.N. KHUHRO1 AND M.I. KHASKHELI2
Abstract
Studies were carried out in Sindh (Pakistan) for survey, identification, incidence and chemical control of leaf spot disease in okra. The disease incidence percent ranged between 53.5- 61.5% at different locations. The maximum incidence (61.5%) was recorded at Hyderabad, followed by Tando Muhammad Khan (58.4%), Tando Allah Yar (55.1%) and Matyari (53.5%). The fungus, Alternaria alternata was isolated and identified as cause of okra leaf spot disease. Severity of leaf spot was significantly reduced in plants sprayed with Ridomil MZ, Dolomile, Topsin-M, Diesomil, protest and Tahfuz as compare to control plants sprayed with water. The results also showed that the mean infected leaves ranged from 4.7-5.9 when the data was recorded before application of fungicides while it was between 2.0-6.4 after two application of tested fungicides. However, significant maximum reduction % in severity of leaf spot disease was recorded in case of Ridomil MZ (2.8), followed by Dolomile (1.9), Topsin-M (1.7), Diesomil (1.6), protest and Tahfuz (1.5). Okra plants infected with leaf spot and sprayed with water (control) showed highly significant reduction in plant height (61.53cm) whereas, the tall plants (95.10) were recorded from plot sprayed with Ridomil M Z followed by Dolomile (91.25 cm), Topsin-M (86.60 cm), Diesomil (78.40 cm), Protest (72.75 cm) and Tahfuz (68.38 cm). Significantly lowest number of fruits per plant of okra (10.50) was recorded in control (sprayed with water), while, highest number of fruits per plant (14.90) were obtained from plot treated with Ridomil M Z, followed by Dolomile (13.90), Topsin -M (13.20), Diesomil (12.70), Protest (12.20), and Tahfuz (11.50). The data also showed highly significant difference between treatments for fruit yield of okra infected with leaf spot. The maximum fruit yield (955 kg per acre) was observed in plot treated with Ridomil MZ, followed by Dolomile (845 kg), Topsin-M (790 kg), Diesomil (738 kg), Tahfuz (594 kg) and Protest (681 kg); whereas minimum fruit yield (495 kg) per acre was recorded in plants not sprayed with fungicides.
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