Fungal contamination of mangoes sold in the town of Dschang and the in vitro effectiveness of essential oils against Colletotrichum gloeosporioides Penz., the aetiologic agent of anthracnose.
Mangoes sold in Dschang town (Cameroon) are infected by four pathogenic fungi which are: Colletotrichum gloeosporioides, Botryodiplodia theobromae, Pestalotiopsis guepinii and Rhizopus nigricans. Essential oils from dry seeds of Piper guineense (P) and Monodora myristica (M) gave yields of 3.58% and 2.18% respectively. The effectiveness of these oils and their mixtures in the in vitro radial growth of C. gloeosporioides (causal agent of anthracnose) showed that the mixture P/M (90/10), P/M (75/25), P/M (50/50) and P/M (25/75) were more effective with respective percentage inhibition (%I) of 92, 89, 86 and 80%. M. myristica oil (%I=30%) was least effective. P. guineense oil (%I=57%) and the mixture P/M (10/90) (%I=70%) showed average effectiveness. The mixture P/M (90/10), P/M (75/25), P/M (50/50) and P/M (25/75) and the P. guineense oil showed fungistatic effects against C. gloeosporioides at the concentration of 20 µl/ml. Base on the effectiveness of these mixtures on the growth of the pathogen, these oils could be later tested for a phytosanitary protection of mangoes in order to preserve its physical and organoleptic quality.