Abstract
Sodium pentachlorophenate and phenyl mercury chloride have been tested as eradicant sprays against apple canker. Trials with inoculated shoots showed that neither of these sprays would affect an established leaf‐scar canker. Both chemicals checked sporulation of Nectria galligena on cankers but phenyl mercury chloride was the more effective and reduced sporing up to 18 months after application.The incidence of leaf‐scar infection was diminished by treatments reducing sporulation, such as spraying with phenyl mercury chloride or the removal of diseased material from the tree. Bordeaux mixture used as a protectant winter spray was ineffective in reducing leaf‐scar infection.
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