Integrity Research Journals

ISSN: 2536-7072
Model: Open Access/Peer Reviewed
DOI: 10.31248/JASP
Start Year: 2016

Effectiveness of systemic and contact fungicides against Alternaria citri the causal organism of citrus brown spot disease in citrus mangroves of Pakistan   |   Article Number: 4CA89B7F3   |   Vol.3 (2) - April 2018

Received Date: 26 March 2018   |   Accepted Date: 16 April 2018  |   Published Date: 30 April 2018

Authors:  Muhammad Farooq* , Memoona Siddique , Ateeq –Ur-Rehman , Moses Kwaku Golly* , Bakhshah Zib , Ismail khan , Shoaib Khan , Iltaf Khan , Muhammad Bakhtiar and Naila Ilyas

Keywords: Chemical control, disease incidence, disease severity, inhibition, mycelia growth.

Brown spot of citrus caused by Alternaria citri is among several diseases responsible for low crop production in Pakistan.  Hence, the present study provides new information about the selection of chemicals for control of citrus brown spot in Pakistan. A. citri was isolated from different diseased samples of citrus plant collected from different orchards of Punjab Province of Pakistan. In vitro efficacy of fungicides was checked against A. citri. Fungicides viz; Thiophenate methyl, Difenoconazole, hexaconazole, Metalaxyl + Mancozeb, Metiram, Mancozeb, Azoxystrobin, Dodine, Chlorothalonil, Fosetyl aluminium were evaluated against tested fungus at various concentrations (25, 50, 100, 200 and 400 ppm) by using poisoned food technique. The results showed that majority of the fungicides exhibited their highest inhibitory activity at a concentration of 400 ppm. Fosetyl aluminium, Metiram, Thiophenate methyl, Mancozeb and Metalaxyl + Mancozeb all exhibited maximum inhibitory mycelial growth of A. citri with 49.55, 52.96, 65.57, 84.86 and 100% inhibtion, respectively at a concentration of 400 ppm whereas, a combination of Azoxystrobin and Difenoconazole exhibited maximum inhibitory mycelial growth of A. citri up to 94.95% at fungicide concentration of 300 ppm.  Cholorthalonil, Hexaconazole, Dodine, and Difenoconazole were the most effective in inhibiting A. citri as no mycelial growth was observed at all concentrations and as such they produced 100% decreased in mycelia growth over the control. The study concluded that Fosetyl aluminium was the least effective fungicide against A. citric.  The present study provides new information on the selection of chemicals for control of citrus brown spot in Pakistan.

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