Aplicação de fungicida via estipe no controle da queima das folhas do coqueiro anão

Abstract

Coconut cultivation is of great importance to the Brazilian economy, generating income and providing various raw materials. Currently, Brazil has one of the highest productivity when compared to other producing countries, however coconut production is reduced due to the attack of diseases. Coconut leaf blight is caused by the fungus Lasiodiplodia spp. and is commonly found in orchards across the country. The objective of the present study was to evaluate doses and application intervals of cyproconazole applied via trunk to control coconut leaf blight. The study was carried out in an area of commercial planting, located in the municipality of Paraipaba, Ceará. The treatments consisted of five doses of fungicide applications based on 10% cyproconazole: doses 0 (control), 1, 5, 10 and 15 mL of commercial product per plant, of pure fungicide. The fungicide was applied, via trunk, through a catheter placed after the perforation of the plant stem. Five replications were used for each treatment and the study was divided into two application intervals: semiannual and annual. It was observed that the fungicide application methodology via trunk was efficient in controlling coconut leaf blight. The dose of 15 mL of commercial product with a semiannual application interval showed the lowest incidence of the disease. The total number of leaves for the highest dose applied was higher than the control, giving an increase of above 10 leaves per plant for the two application intervals.