Acibenzolar-S-Methyl (BTH) action isolate and in combination with fungicides in muskmelon gummy stem blight control

Determinou-se as melhores épocas de aplicação e dosagens do BTH e seu efeito no controle do cancro da haste isoladamente ou em combinação com fungicidas. Foram testadas duas doses de BTH (2,5 e 5,0 g/100L) aplicadas aos 11; 18; 22 e 24 dias após transplantio das mudas. Utilizou-se o delineamento inteiramente casualizado, no esquema fatorial 2 x 4 (doses x épocas) com oito repetições. Posteriormente, utilizou-se a melhor época e dose de BTH associada aos fungicidas: difenoconazole (30 mL de p.c./100L), azoxystrobin (16 mL de p.c./100L) alternado com chlorothalonil (250 g de p.c./100L) e chlorothalonil (250 g de p.c./100L). Utilizou-se também BTH isoladamente e benomyl (70 g de p.c./100L) sem a adição de BTH. As aplicações foram realizadas em intervalos de sete dias até os 28 dias após o transplantio. Os seis tratamentos foram distribuídos inteiramente ao acaso em 15 repetições. Avaliou-se a severidade da doença por meio de escala de notas. Os resultados encontrados demonstraram que a associação de difenoconazole + BTH foi mais eficiente no controle do cancro da haste em melão rendilhado.The better time and dosage of application of BTH were determined and the effect on gummy stem blight control in muskmelon plants, isolated and in combination with fungicides, was evaluated. Two BTH doses (2,5 and 5,0 g/100L) were applied at 11; 18; 22 and 24 days after transplanting of seedlings. Statistical analysis of the data was performed using a completely randomized design with eight replications in factorial scheme 2 x 4 (doses x application time). Subsequently used the better time and BTH dose application associated with fungicides: difenoconazole (30 mL of p.c./100L), azoxystrobin (16 mL of p.c./100L) alternated with chlorothalonil (250 g of p.c./100L) and chlorothalonil (250 g of p.c./100L). Isolated BTH and benomyl (70 g of p.c./100L) without BTH addition were also evaluated. The applications were done in seven-day intervals until 28 days after transplanting. Statistical analysis of the data was performed using a completely randomized design with six treatments in fifteen replications The severity of diseases was evaluated using scale of notes. The association between difenoconazole + BTH was the most efficient in disease control