Centro Agrícola (Jan 2019)
Effect of Mancozeb 80 PH in the appearance of the green stain in tobacco
Abstract
With the purpose of evaluating the effect of the applications of Mancozeb 80 WP in the appearance of the green stain in tobacco (Nicotiana tabacum L.), an experiment was carried out in areas of the Cooperative of Credits and Services "Eduardo Reyes Canto in the municipality of Santa Clara, Cuba, from November 2014 to June 2015 on a softly washed brown soil. The tobacco cultivars Havana 2000, Criollo 98 and Corojo 99 were used. The experiments were carried out under production conditions, in plantations of covered tobacco.Three treatments were included, consisting of two, three and four applications of Mancozeb 80 PH with a dose of 2 kg ha-1. At the time of harvest, the leaves corresponding to each treatment were marked and at the end of the drying process, the number of leaves with green spots per plant was determined.To evaluate the effect of the interval between harvest and the last application of the fungicide in the appearance of the green spot, they were carried out four fungicide applications on each leaf, and three moments settled down for the crop: to the 7, 10 and 13 days after the last application. For each experiment 108 leaves were evaluated by treatment. The results showed that with the increase in the applications of Mancozeb 80 PH and the exposure time on the leaves, the percentage of green spot in them increased. The most susceptible cultivar was Habana 2000, while Criollo 98 was the most tolerant.
