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Asian Journal of Plant Pathology

Year: 2017 | Volume: 11 | Issue: 1 | Page No.: 10-17
DOI: 10.17311/ajppaj.2017.10.17
Optimization of the Spray Schedule in Management of Ascochyta Blight (Ascochyta rabiei L.) of Chickpea (Cicer arientinum L.)
J.N. Nganga , P.K. Kimurto, J.M. Muthamia, B.K. Towett and S.O. Ochola

Abstract: Objective: The efficacy of timing foliar sprays with azoxystrobin and difenoconazole in control of ascochyta blight (Ascochyta rabiei L.) was evaluated in field trials conducted at Agricultural Training Centre Koibatek and Egerton University, Njoro. Methodology: The experiments were laid out in a split-split plot design with three replications arranged in a randomized completely block design. Plots were sprayed 2-6 times in the sub plots at five stages of chickpea growth; seedling, early vegetative, late vegetative, flowering and podding stages. In the sub-sub plots, asymptomatic chickpea seeds were left treated or untreated with either azoxystrobin or difenoconazole fungicides. Data on disease incidence and severity were collected and subjected to analysis of variance following general linear model procedure in SAS. Significant means at F-test were separated using Tukey’s test statistics at p≤0.05. Results: Fungicides applied as foliar sprays were more effective in suppressing disease incidence and severity than seed dressing alone. There was significant reduction in incidence and severity following multiple foliar applications of 3-6 times compared to control. Percent disease incidence reduced by 65.5, 62.25, 40.55 and 33% in Njoro and 52.8, 49.63, 51.41 and 22.64% in Koibatek following application of 6, 5, 4 and 3 foliar sprays, respectively compared to control. Seed dressing was effective in delaying initial disease incidence and reducing severity at early stages of development but lacked advantage over foliar spraying alone in later stages of chickpea growth. Conclusion: Cultivation of susceptible chickpea cultivars in Kenya under high disease pressure environment may require 5-6 foliar sprays with either azoxystrobin or difenoconazole while 3-4 foliar sprays with either of the two fungicides are required for effective management under low disease pressure.

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How to cite this article
J.N. Nganga, P.K. Kimurto, J.M. Muthamia, B.K. Towett and S.O. Ochola, 2017. Optimization of the Spray Schedule in Management of Ascochyta Blight (Ascochyta rabiei L.) of Chickpea (Cicer arientinum L.). Asian Journal of Plant Pathology, 11: 10-17.

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