Wood, P.N., and R.M Beresford. “Avoiding Apple Bud Damage from Autumnapplied Urea for Black Spot (<i>Venturia inaequalis</i≫) Control”. New Zealand Plant Protection 53 (August 1, 2000): 382–386. Accessed April 22, 2024. https://journal.nzpps.org/index.php/nzpp/article/view/3613.