ABSTRACT
The bean crop is affected by several diseases, most notably anthracnose (Colletotrichum lindemuthianum) and bacterial common blight (Xanthomonas axonopodis pv. phaseoli). Thus, there is a need to develop crop management techniques aimed at their control. The present study was carried out with the objective to evaluate the effect of acibenzolar-S-methyl (ASM) alone and with fungicidal mixture on the control of these diseases in the bean crop. The treatments were ASM applied at 7, 14 or 21 DAE (days after emergence), 2 applications of ASM (7 DAE + 14 DAE or 14 DAE + 21 DAE) and 3 applications done at 7, 14 and 21 DAE. These treatments were combined with three chemical control programs: tin triphenyl hydroxide; tin triphenyl hydroxide + azoxystrobin; and azoxystrobin + difenoconazole. One application of ASM made at 7 DAE was sufficient to reduce anthracnose and bacterial common blight by 60 and 38%, respectively, increasing grain yield by 17%. However, the best results were observed when ASM and fungicides were used together. The data suggest the potential for using ASM in a program for the control of bean diseases.
KEY WORDS
Resistance induction; chemical control;
Phaseolus vulgaris
;
Colletotrichum lindemuthianum
; Xanthomonas axonopodis pv phaseoli