SUSCEPTIBILITY AND KESISTANCE TO CROWN-GALL. 



19 



Table III.— Percentage of diseased vines of each variety of grapes grown in the experi- 

 mental vineyard at Fayetteville, Ark., in infected soil. 



Variety. 



Mary Ann 



Telegraph 



Pernios 



Dracut Amber. 



Duchess 



Black Pearl 



Faith 



Golden Gem... 



Black July 



Lincoln 



Merrimack 



Opal 



Goethe 



Centennial 



America 



Early Market. . 



Variety or hybrid of- 



T 'Ms labrusca 



....do 



....do 



....do 



Vitis labrusca X 



Vitis vulpina 



Vitis vulpina X 



Vitis aestivalis X 



Vitis aestivalis 



...do 



Vitis labrusca X vinifera 



....do 



do 



Vitis aestivalis X labrusca 



1 'Ms linsecnmii X rupestris 



( Vitis vulpina X labrusca) X vulpina. 



Proportion 

 0/ diseased 

 plants re- 

 sulting. 



Per cent. 



80 

 40 

 20 

 20 

 40 

 40 

 20 

 20 

 20 

 60 

 67 

 50 

 40 

 40 

 40 

 10 



From the table it will be seen that varieties or hybrids of a num- 

 ber of species were susceptible to the disease. In the following list 

 is given the names of those varieties or hybrids which remained free 

 from the disease and are considered resistant, to some extent at least. 

 Since there were, as a rule, not more than five vines of each variety, 

 the small number must be taken into consideration as lessening the 

 chances of infection. 



The following varieties or hybrids of American grapes were free 

 from disease: 



Of the varieties derived from Vitis labrusca: Amanda, Arkansaw, 

 Cambridge, Concord, Cottage, Eaton, Hartford, Illinois City, Ives, 

 Martha, Moores Early, and Wyoming. 



Of the varieties derived from Vitis aestivalis: Arkansas, Black 

 Herbemont, Onderdonk, Muench, Mrs. Munson, Neva Munson, and 

 Superb. 



Of the varieties derived from Vitis linsecomii: Great Cluster and 

 Lincy. 



Of the hybrids of Vitis labrusca X Vitis vinifera: Barry, Black 

 Eagle, Governor Ross, Herbert, Highland, Triumph, Campbell's 

 Early, and Conqueror. Of Vitis labrusca X aestivalis: Gold Coin, 

 Of ( Vitis labrusca X vinifera) X (aestivalis X vinifera) : Brilliant. 



Of the hybrids of Vitis linsecomii X aestivalis: Admirable, Bumper, 

 Delicious, Kemp, Hopkins, Hermann Jaeger, Marguerite, Oriole, 

 Perry, and Vinita. Of Vitis linsecomii X labrusca: Beacon and 

 Doctor Collier. Of Vitis linsecomii X (labrusca X vinifera): Bailey, 

 Big Extra, Big Hope, Fern Munson, Long John, Newman, R. W. 

 Munson, and W. B. Munson. Of Vitis linsecomii X {aestivalis X 

 labrusca): Laussell. Of Vitis linsecomii X (labrusca X vinifera): 

 Carmen. Of (Vitis linsecomii X rupestris) X (labrusca X): Rupert, 



183 



