Vol. 16 No: 3

Title:
Studies on Fruit Bud Formation in Deciduous Fruit Trees in South Africa III. Some Effects of Winter Oil Sprays on Fruit Bud Formation and Leaf Bud Development in the Bon Chretien Pear

Author:
T. MICKLEM

pp: 216-223

Abstract:
It has been shown by Mally (8) and Black (2) that various winter oil sprays have a beneficial effect on blossoming, fruit production and growth of deciduous fruit trees such as pears, apples and plums. The aim of the present study was to determine some of the effects of these sprays on fruit bud formation and leaf bud development in the Bon Chretien pear.

On August 29th, 1935, one half of each of four Bon Chretien pear trees on the University experimental farm at Stellenbosch were sprayed with dormant oil sprays by Black (2). The four trees were 20 years old, on communis seedling stocks, planted 20 ft. apart; prior to this experiment they had received similar cultural treatment. Before spraying, a canvas sheet was drawn through the main branches of each tree and held in position, dividing it into two equal portions; one half of the tree was then sprayed, the remaining half being left unsprayed. The author was kindly allowed to collect buds from these trees to determine the effect

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