Agronomic and Pathological Responses of Shallots to Trichoderma harzianum Secondary Metabolites in Pot Experiments with Various Seedling Numbers

DOI

10.2991/978-94-6239-596-1_2How to use a DOI?

Keywords

Bulb quality; Diseases incidence; Secondary metabolites

Abstract

Shallots (Allium ascalonicum L.) are a major horticultural commodity in Indonesia with high economic value. This study aimed to evaluate the effectiveness of secondary metabolites produced by Trichoderma harzianum at different concentrations under various planting densities in shallot cultivation. The pot experiment employed a factorial completely randomized design consisting of two factors: secondary metabolite concentration (0%, 5%, 10%, and 15%) and planting density (1, 2, or 3 seedlings per pot). Agronomic parameters included plant height, number of bulbs per plant, bulb weight, total bulb weight per plant, and bulb diameter, while the pathological response was measured as anthracnose disease severity. Application of a 5% concentration of secondary metabolites synthesized by T. harzianum significantly increased plant height (by 16.08%), number of bulbs per plant (by 45.082%), and bulb diameter (by 24.21%). Additionally, anthracnose disease severity decreased by up to 25.57%. Higher concentrations Shallots are a major horticultural commodity in Indonesia with high economic value. of secondary metabolites (10% and 15%) did not result in significant differences compared with the 5% treatment.

Copyright

© 2026 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

Download article (PDF)

TY  - CONF
AU  - Agusthinus Marthin Kalay
AU  - Reginawanti Hindersah
AU  - Rhony Einstein Ririhena
AU  - Abraham Talahaturuson
AU  - Dina Artika Br Sembiring
PY  - 2026
DA  - 2026/02/26
TI  - Agronomic and Pathological Responses of Shallots to Trichoderma harzianum Secondary Metabolites in Pot Experiments with Various Seedling Numbers
BT  - Proceedings of the 1st International Conference on Environmental Sciences, Agriculture, and Socioeconomics (ICESAS 2025
PB  - Atlantis Press
SP  - 4
EP  - 15
SN  - 2468-5747
UR  - https://doi.org/10.2991/978-94-6239-596-1_2
DO  - 10.2991/978-94-6239-596-1_2
ID  - Kalay2026
ER  -