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Management of Phytophthora blight (Phytophthora capsici) of pepper in Illinois
M. BABADOOST (1), C. Pavon (2), S. Z. Islam (3). (1) Univ of Illinois, Urbana, IL, U.S.A.; (2) University of Illinois, Urbana, IL, U.S.A.; (3) Syngenta Seeds, Inc., Naples, FL, U.S.A.

Phytophthora blight, caused by <i>Phytophthora capsici</i>, is one of the most important diseases of peppers in Illinois. <i>P. capsici</i> can infect pepper plants at all growth stages, causing seedling death, root rot, crown rot, stem blight, leaf spot, and fruit rot. To develop effective strategies for management of <i>P. capsici</i> in peppers, three approaches were evaluated, which included: (i) using resistant cultivars, (ii) crop rotation, and (iii) fungicide application. To identify resistant pepper cultivars to <i>P. capsici</i>, accessions/cultivars of bell pepper were tested in the greenhouse and field, and several cultivars were found resistant/tolerant to <i>P. capsici</i>. To establish effective crop rotation for management of <i>P. capsici</i>, host-range of the pathogen was determined and survival of the pathogen in soil textures and soil depths were investigated. A 4-year crop rotation with nonhost plants and effective weed control are recommended for management of Phytophthora blight of peppers. More than 40 fungicides with potential effects were evaluated for their efficacy for control of <i>P. capsici</i>. Ametoctradin + dimethomorph (Zampro 525F), captan (Maestro 80DF), cyazofamid (Ranman 400SC), dimethomorph (Forum 4.16 SC), famoxadone + cymoxanil (Tanos 50WDG), fluazinam (Omega 500F), fluopicolide (Presidio 4SC), mandipropamid (Revus 2.09SC), and mefenoxam (Ridomil Gold Copper 65WP, Ridomil Gold EC 4SC) fungicides were effective for control of <i>P. capsici</i> in pepper.

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