June 15, 1921 Varietal Susceptibility of Beans to Rust 399 
of the rust attack were not so noticeable in 1919 as in 1918. The sus¬ 
ceptible varieties were severely rusted, but defoliation was not so severe 
until later in the season, and their yield was better in comparison with 
that of the more resistant varieties than in 1918. No data on the cur¬ 
tailment of the yield of the pole varieties as determined by rust infection 
could be obtained because of the severity of anthracnose on certain 
varieties. 
The greenhouse and field behavior of the dry-shell varieties is com¬ 
pared in Table VIII, and that of the pole varieties in Table IX. The 
varieties are listed according to susceptibility in the greenhouse. 
Of the 17 varieties in Table VIII the first 7, which were classed as sus¬ 
ceptible in the field, all rated above 70 per cent fertile infection in the 
greenhouse, while the 9 varieties in the resistant classes—enduring, 
proof, and free—all fell below 50 per cent fertile infection. Robust, 
not included in the greenhouse tests, was classed as rust-proof in the 
field and outyielded all other varieties in 1919. This is the only small 
white bean in our tests, with the exception of Blue Pod Navy, which has 
successfully withstood the attack of rust. Robust seems to be an 
especially desirable variety in that it combines resistance to mosaic, as 
shown by Reddick and Stewart (9), with rust resistance, attractive 
appearance, and desirable commercial type. Bird Eye, grown for the 
first time in 1919, was classed as rust-free and was second to Robust 
in yield. This variety is similar to Yellow Eye in seed characters and 
is popular in some localities in Virginia. It is attractive and of good 
quality and seems to be very dependable. The yields in 1918 are more 
representative of the curtailment of production by rust than those in 
1919, since anthracnose was severe in the latter year. The yields of 
Improved Goddard, Horticultural Dwarf, and White Kidney were 
reduced materially by anthracnose. Bird Eye and Well’s Red Kidney 
were especially free from anthracnose. Robust was quite free from an¬ 
thracnose in 1919 but was severely injured in 1920. 
Of the 18 varieties of pole beans listed in Table IX the 8 which were 
classed as susceptible all exceeded 50 per cent fertile infection in the 
greenhouse. All the rust-proof and rust-free varieties fell below 50 
per cent; but the two rust-enduring varieties, Golden Cluster and Ken¬ 
tucky Wonder Wax, rated 71 and 68 per cent. The yield of all of the 
susceptible varieties was severely curtailed by the rust attack in 1918, 
5 of them being complete failures (PI. 71, A). McCaslan was not grown 
in 1918 but was seriously damaged in 1919. No yield data for 1919 are 
given, as explained previously, because of the severity of anthracnose. 
This injury was especially severe on Indian Chief, Everbearing, Mont 
d’Or, Marblehead, Brockton, and Lazy Wife. 
