RESEARCH ON EUCALYPTUS EXTRACT TO PREVENT Colletotrichum spp. DISEASE ON TOMATO IN NGHE AN PROVINCE

Abstract

When using eucalyptus extraction invitro condition with extraction concentrations of 5%, 10% and 15%, the influence on germination inhibition of Colletotrichum spp. spores is 100% after 24 hours treatment. In greenhouse conditions, spraying eucalyptus extract at concentrations of 5, 10 and 15% on tomato plants after 24 hours of infection, the inhibitory effect on the pathogenicity of Colletotrichum spp. when the plants began to flower reached 51.28 - 71.08% and on plants with fruit diameters of 3 - 4 cm reached 49.03 - 67.28%. The prevention effectiveness reached of eucalyptus extract in production when the plants began to flower, when the plants had fruit with fruit diameters of 3 - 4 cm and after the first harvest ranged from 49.25 - 65.31%.