The journal of the Ministry of Agriculture. . leaf, which is usually consideredby growers to be one of the characters of a reverted present writer, however, prefers not to lay emphasis onthis character, because though frequently it is a reliable guide,a fuller examination of leaves in the field shows that it isnot completely so. One can find cases where reverted leavesare quite broad in shape. The same applies to size. Whileit is true that in the majority of cases reverted leaves aresmaller than normal, it is not always so. For instance, if a 1921.] Keversion of Blackcurrants. 1125 re
The journal of the Ministry of Agriculture. . leaf, which is usually consideredby growers to be one of the characters of a reverted present writer, however, prefers not to lay emphasis onthis character, because though frequently it is a reliable guide,a fuller examination of leaves in the field shows that it isnot completely so. One can find cases where reverted leavesare quite broad in shape. The same applies to size. Whileit is true that in the majority of cases reverted leaves aresmaller than normal, it is not always so. For instance, if a 1921.] Keversion of Blackcurrants. 1125 reverted bush grown under good cultural conditions be cutto the ground, the following seasons growth has quite largeleaves, which, at first sight, appear to be almost normal inshape also, but their reverted state is revealed quickly by themethod outlined above. Conversely, small leaves are notnecessarily reverted : such leaves, quite normal in character, areproduced frequently both at the beginning and at the end of theseason. Fig. i. Fig. Fig. 3. Fig. 4. Fig. 5. Fig. 7. Drawings of Blackcurrant Leaves showing successive Stages of numbers indicate Submain 1.—Normal 2-7.—Successive Stages of Reversion. 1126 Keversion of Blackcurrants. [Mar., For convenience of comparison, the points already discussedhave been summarised in the table given below. The methodof identification described above has enabled the course of thedisease to be followed in considerably more detail and withgreater accuracy than hitherto. The results obtained cannotbe described here through lack of space, but they show that areverted bush may start the season by producing perfectlynormal leaves. This, however, does not continue long, perhapsonly for a few leaves, but it means that in the early part ofthe season no attempt should be made to identify the disease Table. Figure. No. of SubmainVeins. Character ofMargin. Serration. No. ofuninnervatedpointlets. 1 5 Normal IT Fi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
