Control of anthracnose in banana with cassava starch film associated or not with essential oils

Abstract

The objective of this work was to evaluate the in vitro and in vivo potential of cassava starch film associated or not with essential oils in the control of Colletotrichum musae of banana. Were tested clove oils (Eugenia caryophyllata), thyme (Thymus vulgaris), lemongrass (Cymbopogon citratus), cinnamon (Cinnamomum zeylanicum) and oregano (Origanum vulgare) at 0.1% associated or not with film 2 and 3%. Mycelial growth and conidial germination in vitro and anthracnose in vivo were evaluated. In the curative and preventive controls, the fruits were inoculated with conidia before and after coating, respectively. The major components of essential oils were: eugenol, ?-caryophyllene and ?-humulene in clove; thymol, ?-cymene, carvacrol and ?-pinene in thyme; geranial and neral in lemongrass; trans-Cinnamaldehyde and eugenol in cinnamon; carvacrol, ?-Terpinene and linalool in oregano. In vitro, total inhibition of mycelial growth and germination of conidia with oregano oil was observed. The films in the concentrations of 2 and 3% isolated and combined with oils of lemon grass and thyme, in addition to these isolated oils, provided a reduction in the size of anthracnose lesions.