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Evaluation of Fungicides and Fungicide Application Methods to Manage Phytophthora Blight of Pigeonpea

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Relation http://oar.icrisat.org/12250/
https://www.mdpi.com/2077-0472/13/3/633
https://doi.org/10.3390/agriculture13030633
 
Title Evaluation of Fungicides and Fungicide Application Methods
to Manage Phytophthora Blight of Pigeonpea
 
Creator Sharma, M
Ramanagouda, G
Tarafdar, A
 
Subject Pigeonpea
Plant Pathology
 
Description Phytophthora, a blight of pigeonpea caused by Phytophthora cajani, has been significantly increasing in major pigeonpea production regions of India. Limited information on infection with this pathogen and its epidemiology, as well as a lack of adequate resistant cultivars, is hampering the management of Phytophthora blight significantly. Therefore, five fungicides, viz., metiram + dimethomorph, cymoxanil + mancozeb, famoxadone + cymoxanil, mancozeb, and metalaxyl-M + mancozeb, were evaluated against P. cajani under control conditions to control zoospore induction, as well as the infection of zoospores, at the seedling stage. The half-maximal effective concentration (EC50) of fungicides for mycelial inhibition was calculated. The lowest EC50 was recorded in metiram + dimethomorph (0.17 µg/mL), followed by the metalaxyl-M + mancozeb (2.49 µg/mL) and cymoxanil + mancozeb (8.23 µg/mL) fungicides. The formation of the
sporangium and zoospores was most significantly affected by metalaxyl-M + mancozeb, followed by metiram + dimethomorph and cymoxanil + mancozeb, in terms of sporangia viability and zoospore germination and encystment. Further, under glasshouse conditions, different fungicide application
methods (e.g., seed-treatment; soil-drench; foliar-spray, either singly or in combinations) were evaluated with fungicides on susceptible (ICP 7119) moderately resistant pigeonpea (ICPL 99010, ICPL 20135 and ICPL 99048) cultivars. The seed-treatment + soil-drench, soil-drench + foliar-spray, and soildrench of fungicide application methods were found to be effective in controlling the Phytophthora blight, at p < 0.001. A combination of the seed-treatment + soil-drench and soil-drench + foliar-spray methods, using metalaxyl-M + mancozeb or metiram + dimethomorph fungicides on moderately resistant cultivars (ICPL 99010), has a synergistic effect on the ability to control the Phytophthora blight at the seedling stage.
 
Publisher MDPI
 
Date 2023-03-07
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights cc_attribution
 
Identifier http://oar.icrisat.org/12250/1/Agriculture_13_3_1-15_2023.pdf
Sharma, M and Ramanagouda, G and Tarafdar, A (2023) Evaluation of Fungicides and Fungicide Application Methods to Manage Phytophthora Blight of Pigeonpea. Agriculture (TSI), 13 (3). pp. 1-15. ISSN 2077-0472