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- Author or Editor: W. J. Sheppard x
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.
Fluctuations of macronutrient levels in the leaves, stems and roots were analyzed in Cotoneaster dammeri, C. K. Schneid, cv. Royal Beauty and Juniperus horizontalis, Moench cv. Piumosa during the overwintering period. Potassium, Mg and Ca levels, in both species, maintained periods of relative stability. Tissue P levels remained stable in all tissues, while Ν levels in leaves, stems and roots of both species fluctuated significantly throughout the sampling period.
Consistent sprout control was obtained with peach trees (Prunus persica (L.) Batsch cv. Sungold) when 0.25, 0.5, 0.75 or 1% naphthaleneacetic acid (NAA) was applied to pruning cuts during 2 years with sprout control generally proportionate to concentration. NAA treatments induced gummosis around the pruning cuts with the degree of gummosis related to concentration.