l62 



Disease Resistance. 



The subject of disease resistance in plants has received increased 

 attention of late. Because of the severity of anthracnose, in 

 recent years much effort has been given to the production of dis- 

 ease-resistant varieties of beans. As shown in the following pages, 

 a considerable number of varieties are described as being more or 

 less disease-resistant. It is note-worthy that some of the newer 

 varieties appear to be immune. This immunity, however, seems 

 only temporary, for many varieties which were considered resistant 

 a few years ago are now susceptible. This suggests the importance 

 of selection in order to maintain a certain standard. It may also 

 suggest the importance of new varieties. No data on this subject as 

 applied to beans has been obtained. Professor Eckenbrecher^ found 

 that certain newer varieties of potatoes were comparatively free from 

 scab. On the other hand, while varieties of recent origin frequently 

 show a high degree of resistance, many of them are just as 

 susceptible as the older ones. There are also a number of our 

 oldest varieties which show a tolerable degree of resistance. 

 In general, the wax-podded sorts are the most susceptible to dis- 

 ease. Many of the green-podded sorts of the best quality are also 

 susceptible. The field varieties are usually less so. 



Desirable Varieties for Various Purposes. 



The varieties mentioned in the following lists are those which, 

 in general, have proved most desirable for various purposes. But 

 there are undoubtedly many varieties not mentioned in these lists 

 which may be better adapted to special conditions. The choice 

 of a variety is influenced by various conditions, such as soil, climate, 

 distance from market, and taste and fancy of the market. The 

 several lists that follow are made up of varieties of various types, 

 such as flat and round pods, plain and splashed pods, and so on. 

 Varieties for market were selected from the standpoint of pro- 

 ductiveness, hardiness, attractiveness and shipping qualities, rather 

 than from the standpoint of quality or texture. 



Dtvarf varieties for home use. — Wax-podded snaps : Wingold, 

 Burpee Kidney, Pencil Pod Black Wax, Stringless Refugee Wax, 

 Keeney Rustless, Yosemite, Green-podded snaps : Giant Stringless, 

 Refugee, Warren. Green-shell beans, excluding Limas : Warren, 

 Improved Goddard, Ruby Horticultural. Limas: Wonder, Dreer, 

 Wood Prolific. 



^ C. von Eckenbrecher, Berichte Deutsch.-Kart.-Kult.-Stat, 1903. 



