ABSTRACT
The aim of this study was to point out which chemical fungicides, from the usually recommended ones, would be more suitable to control common beans diseases, considering indigenous arbuscular mycorrhizal fungi (AMF) as bio-indicator. The experiment was conducted under controlled greenhouse conditions and was comprised by seven treatments and five plots of repetition each one. The treatments were: water, azoxystrobin, pyraclostrobin, tebuconazol + trifloxystrobin, trifloxystrobin, cuprous oxide and mancozebe. AMF root colonization index, amount of viable spore, leaf NPK content, shoot and root dry weight and pod fresh weight were assessed. Azoxystrobin, tebuconazol + trifloxystrobin and trifloxystrobin did not affect significantly the AMF root colonization, amount of spore and leaf NPK content, when compared with control. Pyraclostrobin, cuprous oxide and mancozeb inhibited the AMF root colonization. Using the azoxystrobin, tebuconazol + trifloxystrobin and trifloxystrobin are the best options to control the common bean main diseases without inhibiting AMF activities and its benefits.
Key words:
Phaseolus vulgaris; fungal symbionts; chemical control