. Fig. 4.—Two portions of a branch of a pear-tree damaged by hail. The left-hand figure shows the injured side of the branch ; that on tlie right hand shows the uninjured side. Half nat. size. has been studied in detail by Viala, as affecting the vine. When once attacked, the branches, although yellow, do not die at once, but produce leaves which remain small and are of a yellow colour. The branches produced are numerous, very short, slender, and bear only rudimentary leaves. If the disease occurs during the flowering season, the colour of

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Keywords: ., bookpublishernewyorkmacmillan, booksubjectplantdis, bookyear1910