Synchronized Efficacy and Mechanism of Alkaline Fertilizer and Biocontrol Fungi for Fusariumoxysporum f. sp. cubense Tropical Race 4.

Yuanqiong Li,Yinhai Dai,Shuting Jiang,Shaolong Sun,Xiuxiu Qi,Jiaquan Jiang,Xiaolin Fan,Chengxiang Gao,Lidan Zhang

doi:10.3390/jof8030261

Abstract

The purpose of this study was to determine the effect and mechanism of alkaline fertilizer, bio-control fungi, and their synergistic application on control of Fusarium Tr4 incidence. Synchronized use of the alkaline fertilizer and biocontrol fungi eliminates rhizome browning and reduces the incidence rate of banana Fusarium wilt. The incidence of yellow leaves (ratio of yellow leaf to total leaf) and disease index in +Foc Tr4 CF treatment were the same (65%), while incidence of yellow leaves and disease index in +Foc Tr4 AFBCF were 31% and 33%, respectively. Under the stress of Foc Tr4 infection, the synergistic utilization of the alkaline fertilizer and biocontrol fungi would raise the activities of peroxidase, catalase and superoxide dismutase in banana roots. The root activity of banana was also increased. As a result, the banana height and stem diameter increments, shoot and root dry weight, accumulation of N, P and K in banana plants had been increased. The efficacy of the synergistic application of alkaline fertilizer and biocontrol fungi was not only reducing Foc Tr4 pathogen colonization and distribution in banana plants, but also preventing tylosis formation in vascular vessel effectively. Therefore, the normal transport of water and nutrients between underground and aboveground is ensured.

Highlights

Known as Panama disease or banana wilt, is a soil-borne vascular bundle disease caused by Fusarium oxysporum f. sp. cubense Tropical Race 4 (Foc Tr4) [3]
The biocontrol fungi (BCF) applied in the trail was composed of non-pathogenic Fusarium oxysporum, Paecilomyces Sp. and Trichoderma harzianum QL18-8 suspension with the equal number of spores according to a volume ratio of 1:1:1
This paper combined the application of the alkaline fertilizer with biocontrol fungi (BCF), which consist of non-pathogenic Fusarium oxysporum, Trichoderma, and Paecilomyces lilacinus, as banana wilt control measure

Summary

Introduction

AAA) is of great importance to the world food security as a fruit and food crop [1]. Fusarium wilt has threatened banana production and caused huge economic losses for a long time [2]. Cubense Tropical Race 4 (Foc Tr4) [3]. Known as Panama disease or banana wilt, is a soil-borne vascular bundle disease caused by Fusarium oxysporum f. It is highly contagious, destructive, and difficult to be effectively controlled [4,5]. One of the primary issues is to control Fusarium wilt effectively in banana cultivation

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