Page:Popular Science Monthly Volume 5.djvu/171

Rh date the rule that it is free from galls. So likewise the few exceptional instances of the successful out-door growth of this in Missouri, which have come to my notice, and which it is unnecessary to detail here, do not affect the rule, and only prove that such vines can be grown outdoors when not destroyed by Phylloxera.

(riparia).—, a, 2; (hybrid with vinifera), 0, 2;, c, 1, where the leaf-galls are very abundant, the root-lice are generally less so, and vice versa. The roots have such vitality that disorganization does not always seem to follow the puncture of the louse, and new rootlets put out from the swellings with great vigor and thrift; Delaware, b, 2;, a, 1; (some say a seedling of vinifera, others, again, believe it æstivalis), a, 1; , b, 1;  (hybrid with vinifera), a, 2; , c, 1, much as with Clinton.

(æstivalis).—, a, 1;, 0, 1; , a, 1; , 0, 1; , 0, 1; , 0, 1.

(Labrusca).—, 0, 3, suffering almost as badly as the varieties of vinifera; (hybrid with vinifera), 0, 1;, a, 2; , a, 1; , 0, 2;  Amber, 0, 1;  (hybrid with vinifera) 0, 2; , 0, 2; , 0, 3; , or seedlings thereof, 0, 2; , 0, 1; , 0, 2; , 0, 1; , 0, 1; , 0, 2; , 0, 2;  (hybrid with vinifera) 0, 1.

(vulpina), 0, 0.—From the investigations of Prof. Planchon, it results, as was anticipated from the great differences in character which it presents, compared with the others, that this species is entirely free from the Phylloxera in any form. The root is not only very tough, but has a perceptibly bitter taste, which doubtless renders it obnoxious to the insect. Prof. Planchon examined it thoroughly in North Carolina, where other vines in the vicinity were suffering from the insect.

From the above enumeration we may gather that, with the exception of vulpina no species of cultivated vine is entirely free from the attacks of either the gall-making or root-inhabiting types. Nevertheless vinifera is least and riparia most subject to the former; æstivalis least, and vinifera most subject to the latter.

Of vinifera, a few varieties, under certain conditions, seem to exhibit a power of resistance in this country; and it is singular that some relative immunity has not as yet been noticed among the varieties of this species in Europe.

Of riparia, the Clinton, Taylor, Golden Clinton, and Marion, seem best to resist.

Of æstivalis, all the species enumerated resist well, and I would especially mention Norton's Virginia, Herbemont, and Cunningham, as vigorous growers.