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    Effect of mulching on web blight of beans in Costa Rica

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    Authors
    Galindo, J.J.
    Abawi, G.S.
    Thurston, HD
    Galvez, G
    Date Issued
    1983
    Language
    en
    Type
    Journal Article
    Review status
    Peer Review
    ISI journal
    Accessibility
    Open Access
    Metadata
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    Permanent link to cite or share this item: https://hdl.handle.net/10568/42780
    DOI: https://doi.org/10.1094/Phyto-73-610
    Abstract/Description
    Mulching was highly effective and superior to chemical treatments for the control of web blight (WB) caused in beans by Rhizoctonia solani, the imperfect state of Thanatephorus cucumeris. Plots were established in fields with a history of repeated incidence of WB. Soilborne sclerotia and colonized debris spread by splashing rain were the main sources of inoculum for WB in these fields. Mulching with rice husks (2.5 cm thick) greatly reduced splashing of inoculum and lowered disease severity. At harvest, severity of WB in nontreated and mulched plots planted to cultivar Porrillo 70 was 100 and 13%, and seed yield was 0 and 655 kg/ha, respectively. In a second field with a lower level of inoculum, yield in the nontreated and mulched areas averaged 273 and 835 kg/ha, respectively. Similar results were obtained with cultivar Mexico 27. Mulching with rice husks was superior to PCNB soil drench (40 kg 75 WP/ha) in controlling WB. Seed treatment with benomyl (1 g benomyl, 50% WP, per kilogram of seeds) and soil application of paraquat (1 kg a.i./ha) were ineffective. The local production practice of “frijol tapado,” in which seeds are broadcast in vegetation that is later cut and left as mulch, was as effective as rice husk mulching in reducing the incidence and severity of WB, but yields were lower.
    AGROVOC Keywords
    phaseolus vulgaris; rhizoctonia solani; disease control; chemical control; mulching; cultivation systems; disease transmission; mycoses; diseases and pathogens; pest control; cultivation; control de enfermedades; control químico; cobertura del suelo; sistemas de cultivo; transmision de enfermedades; micosis; enfermedades y patogenos; control de plagas; cultivo
    Subjects
    BEANS; PESTS AND DISEASES;
    Countries
    Costa Rica
    Regions
    Central America
    Collections
    • CIAT Articles in Journals [2636]

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