AQUEOUS EXTRACTS OF PLANTS IN Colletotrichum gloeosporioides INHIBITION IN VITRO AND IN POSTHARVEST GUAVA
2014
Silva, Fernando Henrique Alves da | Nascimento, Juliana Santos do | Nascimento, Selma Rogéria de Carvalho | Ambrósio, Márcia Michelle de Queiroz
Portugués. The effect of plant aqueous extracts in the control of Colletotrichum gloeosporioides (Penz.) Penz. & Sacc. the causal agent of guava anthracnose in, was evaluated in vitro with 1, 2 and 3% aqueous extracts of Azadirachta indica, Nerium oleander, Ocimum gratissimum, Syzygium aromaticum. The experiment was installed in a complete randomized desing in a 3x4 factorial scheme (doses x extracts). For the evaluation, it was calculated the percentage of fungal inhibition. The experiment in vivo was conducted by applying Syzygium aromaticum and Azadirachta indica aqueous extract at 2 and 3%, respectively, in three different storage conditions: refrigerated with and without plastic film (PVC), and at ambient conditions. The experiment was installed in a completely randomized design, in a 2x3 factorial scheme (extracts x storage conditions). We evaluated the external appearance and severity of disease, loss of weight and Brix degrees. Syzygium aromaticum extract at 2% provided 100% of fungal mycelial growth inhibition, and Azadirachta indica extract at the highest dosage (3%) inhibited 20.22%. In fruits, there was not significant statistical difference between the effect of extracts on the external appearance and severity of disease, loss of weight and Brix degrees. In relation to the storage conditions, the ones with plastic film and refrigerated differed from the other conditions obtaining better external appearance and less severity of disease, lower loss of weight and higher Brix degrees.
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