The Effect of Lime-Sulphur Sprays Applied at Different Times in the Season on the Extension Growth of an Apple Rootstock

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Abstract
On four occasions during April and May 2% lime-sulphur was sprayed “to run-off ” on maiden M.IV apple rootstocks. The weight of the subsequent extension growth was recorded and the damage resulting from the sprays calculated. It was shown that the damage done by a spray varied according to the date of application, that the plants did not recover from this damage, that the interaction between pairs of sprays was in general non-significant but that certain specific interactions occurred. The interaction between the fungicide and fungus on the growth of the host is discussed.

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