. Bulletin of the Department of Agriculture. Agriculture; Agriculture. THE GKAPE LEAFHOPPER IN THE LAKE EKIK VALLEY. 0 berries in the cluster, and in a deficiency in the sugar content of the fruit. For these reasons the aggregate injury by this pest during the season of 1912 was fully as great as in that of 1911. Thus far mention of the destructiveness of this pest lias been con- fined to the vineyard areas of the Eastern States. For more than 25 years this species, Typhlocyba comes, including a western variety, coloradensis (fig. 5),has caused an enormous amount of injury to the grapevin
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. THE GKAPE LEAFHOPPER IN THE LAKE EKIK VALLEY. 0 berries in the cluster, and in a deficiency in the sugar content of the fruit. For these reasons the aggregate injury by this pest during the season of 1912 was fully as great as in that of 1911. Thus far mention of the destructiveness of this pest lias been con- fined to the vineyard areas of the Eastern States. For more than 25 years this species, Typhlocyba comes, including a western variety, coloradensis (fig. 5),has caused an enormous amount of injury to the grapevines in the vineyards of California, where it has been recorded as an injurious grapevine pest since 1875. Prof. H. J. Quayle, in Bul- letin 198 of the California Experiment Station, states in regard to its destructiveness that "with the exception of the Phylloxera, the vine hopper is undoubtedly the most destructive insect pest of the vine in the State. It is more uniformly present than any other insect attacking the vine, and each year in some parts of the State it occurs in very great numbers, and in such sections it levies a heavy tax upon the vineyard ; Thus it is evident that, taken in the aggre- gate, the injury sustained by the vineyard industry of the East and the West must amount to an enormous sum. It should be remembered, too, that the injury caused by this pest is not confined to the crop of a single season. It frequently happens that a heavy infestation of one or two seasons' duration may so stunt the growth of the vine that its full fruiting capacity may be re- duced for several seasons. In fact, if special efforts for the resuscitation of badly injured vines are not undertaken they may never re- gain their former productive value. Hence the loss to the vineyardist not only consists in the crop shrinkage, but also in the additional cost of the fertiliza- tion and care required to get the vine back into full bearing Fig. 5.—A wester
Size: 1252px × 1996px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauth, bookcentury1900, bookdecade1910, booksubjectagriculture
