Alternative control of Colletotrichum gloeosporioides in papaya, using vegetable extracts, resistance inducers and fungicide - DOI: 10.4025/actasciagron.v30i3.3500

Abstract

This present work had as objective to evaluate the control of papaya diseases using natural extracts (Allium sativum L., Anadenanthera peregrina L. Speng, and Ocimum basilicum L.), natural oils (Gossypium hirsutum L. and Bixa orellana L.), resistance inducers (Bion^®, Ecolife^® and Agro-mos^®), and a chemical fungicide (Mancozeb/Dithane). Experiment I was conducted to evaluate the inhibitory potential of the treatments on Colletotrichum gloeosporioides mycelial growth in vitro; in Experiment II, artificial inoculation of fungus was performed on healthy papaya fruits, and the severity of stem-end rot was evaluated using a disease index; and in Experiment III, treatments were applied on papaya seedlings artificially inoculated with C. gloeosporioides, and anthracnose was evaluated by means of a disease index. Obtained results showed that extracts of Anadenanthera and Allium were responsible for lower mycelial growth in vitro, and Bion^® was efficient for papaya stem-end rot. In papaya seedlings, the effects of garlic, angico and Bion® differed significantly from the rest, with Bion^® showing the best results for anthracnose control. Papaya seeds were not affected by C. gloeosporioides. Thus, alternative control to stem-end rot and anthracnose on papaya with natural products and resistance inducers should be an option viable for agrochemicals substitution