In vivo efficacy of new molecules of fungicides against Eumusae leaf spot disease of French plantain cultivar Nendran (Musa AAB)
Abstract
The French plantain cultivar, Nendran (Musa AAB) is the most widely and commercially cultivated variety of banana in Kerala. But this cultivar is highly susceptible to foliar fungal diseases especially leaf spot diseases. Among the leaf spot diseases, Sigatoka leaf spot caused by Mycosphaerella spp. poses a serious threat to banana cultivation. The studies on characterization of the pathogen associated with Sigatoka leaf spot disease complex in Kerala revealed that the predominant leaf spot disease is Eumusae leaf spot disease caused by Mycosphaerella eumusae. With an objective to develop a fungicidal recommendation for the sustainable management of this disease, a field experiment was conducted during 2016-17 at Banana Research Station, Kannara by evaluating the efficacy of six chemical fungicides viz., trifloxystrobin (25%) + tebuconazole (50%) (Nativo® – 0.4g/L), propiconazole (Tilt® – 1ml/L), copper hydroxide (Kocide® – 2g/ L), pyraclostrobin (Headline® – 1g/L), hexaconazole (5%) + captan (70% (Taqat® – 2g/L) and Bordeaux mixture (1%). All the chemical fungicides used in the study were found to be superior compared to unsprayed control. However, there was a variation in the efficacy between the treatments. The foliar application of the systemic fungicide trifloxystrobin + tebuconazole (0.4g/L) recorded the lowest per cent disease severity (PDS) of 15.43 per cent with the eighth leaf of the plant as the youngest leaf spotted (YLS) and the maximum disease development time (DDT) of 50.66 days. Among the contact fungicides evaluated, the lowest per cent disease severity of 16.65 per cent was recorded in plants sprayed with copper hydroxide which recorded DDT of 49.33 days and YLS of 7.29. The analysis of fungicide residue in the fruits revealed that there was no residue of the chemicals left in the fruit. The study revealed that four times foliar spraying of systemic fungicide, trifloxystrobin + tebuconazole (0.4g/L) or contact fungicide, copper hydroxide (2g/L) starting from the initial appearance of the disease on the lowest leaves of 75 per cent plants was safe and effective for the management of Eumusae leaf spot disease of banana.Downloads
Published
How to Cite
Issue
Section
License
Copyright © 2001-11 Kerala Agricultural University. Some rights reserved. This journal and the individual contributions contained in it are protected under copyright by the Kerala Agricultural University and the following terms and conditions apply to their use; Photocopying Single photocopies of single articles may be made for personal use as allowed by national copyright laws. Permission of the publisher and payment of a fee is required for all other photocopying including multiple or systematic copying, copying for advertising or promotional purposes, resale, and all forms of document delivery. Permission may be sought directly from the Editor, Journal of Tropical Agriculture, Department of Agronomy, College of Horticulture,, Kerala Agricultural University, KAU PO, Thrissur 680 656, Kerala, India. (Phone: +91-487-2438325; Fax +91-487-2371040; E-mail: editor.jta@kau.in. Derivative works Subscribers may reproduce tables of contents or prepare lists of articles including abstracts for internal circulation within their institution. Permission of the Publisher is required for resale or distribution outside the institution. Permission of the Publisher is required for all other derivative works, including compilations and translations. Notice No responsibility is assumed by the Publisher for any injury and/or damage to persons or property as a matter of products, liability, negligence, or otherwise, or from any use of any methods, products, instructions or ideas contained in the material herein.