Sensibilidade a fungicidas e à solução salina de espécies de colletotrichum associadas a capsicum no nordeste do Brasil

Abstract

The genus Capsicum sp., native of Americas, is composed by bell peppers and chilli peppers, and it has economic importance. These cultures are affected by several diseases, among which we can mention anthracnose, caused by fungi of the genus Colletotrichum. Chemical products is still widely used in anthracnose control worldwide, so the objective of this work was to evaluate the in vitro efficiency of active ingredients of some chemical groups and the osmotic sensitivity in four species of Colletotrichum. For the assays, the active ingredients azoxystrobin, difenoconazole and methyl thiophanate were used in the concentration of 1 μg a.i. mL-1

and 5% sodium chloride. All treatments showed inhibition of mycelial growth greater than 50% for the C. brevisporum, while the osmotic environment did not influence the mycelial growth of the C. truncatum. Azoxystrobin was the active ingredient that showed lower efficiency in the in vitro control; while difenoconazole was the active ingredient that showed the highest efficiency in in vitro control.