Observations of Psylla Resistance Among Several Pear Cultivars and Species. Journal of the American Pomological Society, [S. l.], v. 38, n. 2, p. 34–36, 1984. DOI: 10.71318/apom.1984.38.2.34. Disponível em: https://journal.americanpomological.org/index.php/jofaps/article/view/1531. Acesso em: 15 dec. 2025.