The hardening effect of lime-sulphur sprays on maiden apple trees

Llewelyn, F.W.M.

Ann Appl Biol 55(3): 495-501


DOI: 10.1111/j.1744-7348.1965.tb07962.x
Accession: 014712354

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Maiden Mailing IV apple rootstocks were sprayed with 2% lime-sulphur on 4 occasions and all combinations of these occasions both in the presence and absence of weekly sprays of 0.05% didecyldimethylammonium bromide (DDAB). The effect of these spray schedules was measured fortnightly as the ratio of the dry weights of extension growth plus leaves of sprayed to unsprayed plants. DDAB had no effect upon the growth of the plants. Maximum damage from the lime-sulphur sprays occurred during the 1st fortnight after spraying, the ratio rising again to unity during the next 6 weeks. Early sprays of lime-sulphur resulted in less damage being done by later sprays, thus confirming quantitatively the reported "hardening" effect of these sprays.