Bagging time of ‘Prata-anã’ banana regarding anthracnose control

Abstract The aim of this work was to determine the bagging time of ‘Prata Anã’ banana in order to reduce anthracnose disease. Treatments consisted of protection of banana bunches with TNT bags at emission, 30, 60, 90 and 120 days after emission and of unpacked bunches. Fruits were collected, stored in refrigeration chamber (25 ± 1 °C and 80 ± 5% RH) and evaluated for anthracnose incidence and severity. The study design was completely randomized with six treatments, repeated over two years. Data were submitted to analysis of variance and Tukey test (p <0.05). The physical and chemical characteristics of stored fruits were evaluated every three days for 12 days. The study design was completely randomized with six treatments, four evaluation periods, repeated over two years. Results were submitted to analysis of variance and regression (p <0.05). The anthracnose incidence was reduced by up to 67% by bagging bunches at emission. Bunches bagged at emission and at the first month of development did not show anthracnose severity. Bagging bunches reduces anthracnose incidence and severity. The bagging time does not interfere with the physical and chemical characteristics of fruits.

摘要 本研究旨在明确‘Prata Anã’香蕉的套袋时机，以减轻其炭疽病危害。试验设置以下处理：分别于香蕉果串抽生当日、抽生后30、60、90、120 d使用TNT袋对果串进行套袋保护，以及不套袋的空白对照组。采集果实后将其置于冷藏库（温度25±1 ℃，相对湿度（Relative Humidity，RH）80±5%）中贮藏，对果实的炭疽病发病率与病情严重程度开展评估。本试验采用完全随机设计，共设6个处理，重复试验两年。对所得数据进行方差分析与图基检验（Tukey test，p<0.05）。

此外，每3天对贮藏果实的理化特性进行一次测定，共持续12天；该部分试验同样采用完全随机设计，包含6个处理与4个测定周期，重复试验两年。对该部分数据进行方差分析与回归分析（p<0.05）。

结果显示：于果串抽生当日套袋可使炭疽病发病率最高降低67%；于抽生当日及发育第1个月套袋的果串未出现炭疽病病情。套袋处理可有效降低香蕉炭疽病的发病率与病情严重程度，且套袋时机对果实的理化特性无显著影响。