The Liquid Formula of Bacillus thuringiensis strain MRTLRZ2.1 for Controling Bacterial Leaf Blight (Xanthomonas axonopodis pv. allii) and Increasing Shallot Production in the Field

¹ Department of Plant Protection, Faculty of Agriculture, Universitas Andalas, Padang, Indonesia
² Departement of Plantation Cultivation, Faculty of Agriculture, Campus III Universitas Andalas, Dharmasraya, Indonesia
³ Undergraduate Students, Department of Plant Protection, Faculty of Agriculture, Universitas Andalas, Padang, Indonesia

^* Corresponding author: mira23@agr.unand.ac.id

Abstract

Bacterial leaf blight disease, caused by Xanthomonas axonopodis pv. allii, is a major disease in shallot plants. This disease can be controlled by using the microorganism Bacillus thuringiensis strain MRTLRZ2.1. The purpose of this research was to find the best liquid formula of B. thuringiensis MRTLRZ2.1 to reduce bacterial leaf blight and increase shallot crop production in the field.The study was done through an experiment using a Randomized Complete Block Design (RAK) with six treatments: coconut water formula (AK), tofu waste formula (AT), rice washing water formula (AB), a mix of coconut, tofu, and rice formulas (AKTB), the chemical bactericide Streptomycin (B), and a control group (K). Each treatment had five replications, and each replication had 20 shallot plants. The observed variables were incubation period, disease incidence, disease severity, plant height, number of leaves, fresh bulb weight, and dry bulb weight. The research found that the combined formulation of coconut water, tofu water, and rice water was effective in suppressing the development of bacterial leaf blight caused by Xanthomonas axonopodis pv. allii and increasing shallot production in the field. The treatment resulted in a disease severity of 3.25%, an AUDPC value of 65.63, a disease suppression rate of 98.93%, and a dry bulb weight of 9,507 g per planting hole.