CAUSES OF BLIND WOOD IN ROSES

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Abstract
Exps. were designed to determine the cause of blind-wood formation in the hybrid tea-rose Madame Butterfly and the physiological differences between flowering and blind shoots. Blind-wood shoots averaged 2 nodes less than flowering shoots and reached maturity earlier. Blind and flowering scions grafted on English Manetti stock gave ca. the same % of flowering and blind shoots during 9 mo. when buds from 30-day-old blind shoots were placed in mature flowering shoots and buds from mature flowering shoots were budded into blind shoots, flowering buds and blind buds in flowering shoots produced a high % of flowering shoots, while flowering buds in blind shoots produced an equally high % of blind shoots. Blind shoots pruned back produced 97% blind shoots; and flowering shoots pruned back, an equal % of flowering shoots. This emphasized the stock effect in blind-wood formation. Plants receiving high N treatment from Sept. to June produced the fewest blind shoots, while plants receiving no N had the most blind shoots. About an equal % of flowering and blind shoots was produced during the fall, but in Jan. and March. most of the shoots were blind. In April, May, and June most of the shoots flowered normally. The principal difference in chemical composition of flowering and blind shoots is in the greater content of non-colloidal N in the blind shoots. There was no correlation between colloidal N and blind-shoot production. Blind shoots were very low in reducing-sugar content as compared with flowering shoots but were consistently high in total carbohydrates.

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