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Visando avaliar as interações de suscetibilidade do cupuaçu (Theobroma grandiflorum) e de outros hospedeiros ao fungo Crinipellis perniciosa, plântulas de cupuaçu , cacau (Theobroma cacao), cacau-do-peru (Theobroma bicolor) e jurubeba (Solanum paniculatum), com idade entre seis a oito semanas, foram inoculadas com basidiósporos provenientes de vassouras secas e/ou frutos infetados destes hospedeiros coletados no sul da Bahia. As inoculações foram feitas depositando-se uma gota de 20 µl da suspensão de 5,0 x 10(5) basidiósporos/ml de C. perniciosa, obtidos de cada um dos hospedeiros, na gema apical e no hipocótilo (cupuaçu) de cada muda. Após a inoculação as plântulas permaneceram por 24 h em câmara climatizada, com temperatura em torno de 25 ºC e aproximadamente 100% de umidade. Realizou-se a avaliação final dos sintomas 60 dias após a inoculação. O delineamento experimental utilizado foi o inteiramente casualizado, com 20 tratamentos e quatro repetições de dez plantas. O cacau e o cacau-do-peru foram suscetíveis ao inóculo obtido dos quatro hospedeiros. A jurubeba apresentou reações de suscetibilidade somente aos inóculos dela própria e de cacau. O cupuaçu apresentou sintomas quando inoculado com basidiósporos obtidos dele próprio, de cacau e de cacau-do-peru. O inóculo proveniente de cacau foi o mais infetivo a todos os hospedeiros. Cross inoculations were performed to evaluate the reaction of cupuassu (Theobroma grandiflorum), cacao (Theobroma cacao), patashte (Theobroma bicolor) and jurubeba (Solanum paniculatum) to the inocula of Crinipellis perniciosa obtained from each of these host species. Basidiospores were obtained from basidiomata produced on dried brooms and/or diseased dried pods from each host collected in the south of Bahia. Inoculations were made by depositing a 20ml droplet of a 5 x 10(5) suspension of basidiospores of C. perniciosa on the terminal bud and on the hypocotile region (cupuassu) of each seedling. After inoculation the plants were kept in a moist chamber for 24 h under a temperature of 25 + 1 ºC and at approximately 100% humidity. Symptoms were evaluated until 60 days after inoculation. The experimental design was completely randomized with 20 treatments and four replications of ten plants each. Cacao and patashte were susceptible to inocula obtained from all species used. Jurubeba was susceptible only to inoculum produced in its own species or in cacao. Cupuassu seedlings presented symptoms when inoculated with basidiospores produced from cupuassu, patashte and cacao. Inoculum obtained from cacao brooms was the most infective to all hosts

fitopatologia brasileira

Suscetibilidade do cupuaçuzeiro e outras espécies vegetais a isolados de Crinipellis perniciosa obtidos de quatro hospedeiros diferentes no sul da Bahia