Research article Investigations into the fungicidal effect of cuprous oxide against Phaeocrytopus gaeumannii) on Douglas fir seedlings
Two experiments were carried out in successive years to investigate control of infection of Douglas fir (Pseudotsuga menziesii) by the needle parasite Phaeocryptopus gaeuniannii. Newly flushed seedlings were sprayed past the point of runoff at different intervals after bud-burst, using cuprous oxide fungicide at concentrations between 0.025% and 0.2%, combined with 0.08% Surfac 717 as surfactant. With one exception all concentrations reduced infection on current foliage when sprayed once between 9 and 41 days after flush. Two sprays, the first within 27 days of bud-burst and the second 26 to 57 days later, gave a better level of control in one of the experiments than any single-spray treatment. (no keywords)
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