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Research on Crops

Effects of application methods of microbial mixture on early blight disease (Alternaria solani) and growth of potato


DOI: 10.31830/2348-7542.2024.ROC-1097    | Article Id: ROC-1097 | Page : 457-464
Citation :- Effects of application methods of microbial mixture on early blight disease (Alternaria solani) and growth of potato. Res. Crop. 25: 457-464
NOOR ISTIFADAH, NAOMI ANASTASYA, YANI MAHARANI AND FITRI WIDIANTINI n.istifadah@unpad.ac.id
Address : Agriculture Faculty, Universitas Padjadjaran Jl. Raya Bandung – Sumedang Km. 21 Jatinangor 45363, West Java, Indonesia
Submitted Date : 3-07-2024
Accepted Date : 29-07-2024
Online Published:

Abstract

Early blight (Alternaria solani) is one of important diseases in potato in Indonesia. In previous study, a microbial consortium (Trichoderma harzianum, Bacillus subtilis and Pseudomonas sp.) suppressed the bacterial wilt disease in potato. For application, the microbial consortium was mixed with compost (10%). As the microbial consortium is originally intended for controlling soil-borne diseases, this study examined the ability of the microbial consortium to suppress early blight disease and the effects of application methods on its efficacy. The application methods examined were the methods that targeted for soil-borne as well as airborne diseases. The experiment was conducted in a greenhouse at the Department of Plants and Diseases, Faculty of Agriculture, Universitas Padjadjaran, Sumedang, West Java, Indonesia. The experiment used Randomized Complete Block Design with 10 treatments and three replications. The treatments included application of microbes mixed with compost in planting hole solely or in combination with soaking the potato tubers in suspension of the microbes, drenching water extract of the mixture at 2, 4, 6 weeks after planting (WAP) with or without foliar application of the water extract. The result showed that application method influenced the abilities of the microbial mixture in suppressing early blight disease and supporting the potato growth. Even though the application of microbe-compost in planting medium inhibited the development of early blight disease by 37.8-39.5%, the regular foliar spray of the water extract of the mixture enhanced the disease suppression. Combination between application of the microbe-compost in the planting hole, drenching its water extract at 2, 4, 6 WAP and weekly foliar spray of the water extract suppressed early blight disease by 80.8%. This combination of application methods also supported better plant height, numbers of potato leaflets, roots fresh weight and production of potato tuber.

Keywords

Bacillus subtilis potato growth Pseudomonas Trichoderma harzianum

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