R. . E R, A. . Kishore, and Chandni, “Burr knots in apple trees: Causes, environmental factors, and management”, Ind. Horticulture, vol. 69, no. 4, pp. 20–21, Sep. 2024, Accessed: Jun. 22, 2026. [Online]. Available: https://epubs.icar.org.in/index.php/IndHort/article/view/152990