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- Author or Editor: S. M. Still x
Single applications of 250 or 500 ppm (2-chloroethyl)phosphonic acid (ethephon) and 250 or 500 ppm 7-oxabicyclo (2,2,1) heptane-2,3-dicarboxylic acid (endothall) along with 5 or 10 ppm of [3-(2-[3,5-dimethyl-2-oxocyclohexyl]-2hydroxyethyl)-glutarimide (cycloheximide) provided the greatest defoliation on 1-year old ‘Delicious’, ‘Winesap’, and ‘Hopa’ apples (Malus spp.) and 1-year seedlings of apple and Pyrus calleryana Decne. These combinations caused high shoot and bud damage to certain cultivars which would not make them suitable for nursery utilization. The addition of endothall significantly increased defoliation.
Container grown Acer rubrum L. ‘Red Sunset’ were fertilized weekly with 50, 150 and 300 ppm N. A second growth flush occurred on trees fertilized at 150 and 300 ppm N. Trees fertilized with 300 ppm N contained higher N concentrations in both mature and immature leaves as compared to trees fertilized with 50 ppm N.
Seven fertilizer treatments and a pruning treatment were evaluated for their effect on reducing symptom expression of B toxicity on spring growth of Rhododendron catawbiense Michx. ‘Lees Dark Purple’. Pruning of tissue showing B toxicity was the best treatment based on the first growth flush; treatment with CuS04 + limewater was the best treatment based on the second growth flush.