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PROTECTION OF COFFEE PLANTS AGAINST COFFEE LEAF RUST BY ACIBENZOLAR-SMETHYL

ABSTRACT

Susceptible coffee plants (Coffea arabica cv. Mundo Novo) were protected against coffee leaf rust caused by Hemileia vastatrix, when treated with different concentrations of the compound acibenzolarS-methyl, BTH, (10, 50, 100, 200 and 400 ppm of the commercial product, that contains 50 % of active ingredient, w/w), 72 h prior inoculation with pathogen. The product induced local (66 to 97 %), systemic protection (83 to 94 %), and the protection persisted for at least 10 weeks. At time intervals from 8 to 10 weeks between treatments and challenge inoculations, the foliar area with sporulating lesions were closer to control plants, than others intervals of time. Fluorescent microscopic studies of pathogen development in protected and control leaves indicated that neither the germination nor the appressoria formation were affected by treatment with BTH.

KEY WORDS:
Hemileia vastatrix; induced resistance; BTH; Coffea arabica.

Instituto Biológico Av. Conselheiro Rodrigues Alves, 1252 - Vila Mariana - São Paulo - SP, 04014-002 - São Paulo - SP - Brazil
E-mail: arquivos@biologico.sp.gov.br