{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,21]],"date-time":"2025-10-21T14:58:29Z","timestamp":1761058709636},"reference-count":24,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2007,7,23]],"date-time":"2007-07-23T00:00:00Z","timestamp":1185148800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Basic Microbiol."],"published-print":{"date-parts":[[2007,8]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The antifungal activities of novel salicylic acid derivatives, salaceyin A, 6\u2010(9\u2010methyldecyl) salicylic acid, and salaceyin B, 6\u2010(9\u2010methylundecyl) salicylic acid were evaluated against plant pathogenic fungi. Salaceyin A showed antifungal activity against <jats:italic>Cladosporium cucumerinum, Colletotrichum orbiculare<\/jats:italic> and <jats:italic>Phytophthora capsici <\/jats:italic> at 64 \u03bcg ml<jats:sup>\u20131<\/jats:sup> while salaceyin B was less effective. <jats:italic>In vitro<\/jats:italic> antifungal activities of the compounds were influenced by the experimental pH value of the MIC test medium wherein their antifungal activities were enhanced by increasingly acidic conditions. Salaceyin A showed potent <jats:italic>in vivo<\/jats:italic> control efficacy against <jats:italic>Phytophthora<\/jats:italic> blight in pepper plants. The disease was effectively suppressed at 500 \u03bcg ml<jats:sup>\u20131<\/jats:sup>, which was comparable to the commercial fungicide, metalaxyl. Salaceyin A suppressed anthracnose development on cucumber leaves in a concentration dependent manner. The control efficacy of salaceyin A against <jats:italic>C. orbiculare<\/jats:italic> infection was similar to chlorothalonil when applied prior to pathogen inoculation. Since the salaceyins are derivatives of salicylic acid, a known important signal molecule critical to plant defenses against pathogen invasion, we investigated the possibility that exogenous application of the salaceyin A would activate a systemic acquired resistance against <jats:italic>P. capsici<\/jats:italic> infection and <jats:italic>C. orbiculare<\/jats:italic> development on pepper and cucumber plants respectively. The addition of 500 \u03bcg ml<jats:sup>\u20131<\/jats:sup> of salaceyin A to the plant root systems did not significantly decrease disease development in the hosts. We are led to conclude that the disease control efficacy of salaceyin A against the <jats:italic>Phytophthora<\/jats:italic> blight and anthracnose diseases, mainly originates from the direct interaction of the agent with the pathogens. 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