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Strawberry ( Fragaria  ×  ananassa ) and papaya ( Carica papaya ) are susceptible to fungal plant pathogens such as  Botrytis cinerea  and  Colletotrichum  spp., which are controlled mainly by chemical fungicides. However, their use causes adverse health effects. Therefore, the search for ecological alternatives is essential to reduce the impact of pesticides. This study aimed to identify  Botrytis  spp. and  Colletotrichum  spp. isolated from strawberries and papaya fruits with symptoms of grey mould and anthracnose disease and to evaluate the  in vitro  antifungal activity of different fatty acids on their mycelial growth. Phylogenetic analysis allowed the identification of  Botrytis cinerea  and  Colletotrichum nymphaeae  isolated from strawberry and  C. siamense  from papaya, which have been reported as pathogens of both crops. The  in vitro  antifungal index (AI) of the fatty acids was determined at concentrations of 100, 1000, and 2000 µM. Inhibition assays showed AIs of 100% for  B. cinerea, C. nymphaeae , and  C. siamense  using decanoic acid (1000 and 2000 µM). Sodium octanoate (1000 and 2000 µM) and hexanoic acid (2000 µM) also inhibited  C. nymphaeae  with an AI of 100%. This is the first report on the antifungal effects of decanoic acid on three isolated fungi, as well as sodium octanoate and hexanoic acid, on  C. nymphaeae . These results suggest that these molecules could potentially control diseases caused by these fungi in strawberry and papaya fruits.

Phylogenetic identification of fungi isolated from strawberry and papaya fruits and their susceptibility to fatty acids