Recovering P. cactorum was accomplished by inoculating ten, 2-year-old Cattleya hybrid clones, replicated 4 times, with
a 3-d-old hyphal suspension of P. cactorum, placed in a dew chamber at 27 °C for 7 d, and observed for symptoms after
10 d. The visible symptoms and signs were removed from the infected cattleyas. These orchids were treated with drenches and sprays with four applications of five fungicides: Banrot, Natriphene, Shield Brite, Truban and Phyton 27. In addition to the water control checks there were also control plants free of P. cactorum. The plants were evaluated for symptoms of
P. cactorum after 120 d in a greenhouse maintained at temperatures of 21 °C day/18 °C night.