July 15, 1925 
Bean Varietal Tests for Disease Resistance 
151 
of the tough-podded kidney beans in France. As grown at Lansing, Mich., the 
plants are of dwarf, indeterminate growth, 12 inches high; foliage small, medium 
green; flowers white; pods green, oval in cross section, curved, to 5 inches 
long, % inch wide, stringy, parchmented, 4 or 5 seeds per pod; dry seeds medium 
size, flat, Jf inch long, ^ inch wide, and ^ inch thick, kidney-shaped, excellent 
as green shell beans. This variety may be used in hybridization the same as 
Beurre blanc nain, while the longer, narrower pods make it more desirable for 
crossing with garden types. 
No. 299. Nain mangetout extra-h&tif, described by Denaiffe (4 y pp- 160, 161). 
As grown at Lansing, Mich., plants are very dwarf, 6 to 8 inches high, determi¬ 
nate, very early; foliage light green; pods green, round, slightly curved, stringy, 
parchmented, 3 to 3J^ inches long, % inch wide, 4 or 5 seeds per pod; dry seed 
white with light yellow ring around hilum, inch long by inch wide by 
inch thick, round in cross section, rounded ends. This variety seems to have 
no direct horticultural uses in this country, but appears of value" to use in crosses 
where a very early, resistant bean is desired 
No. 286. Jaune de la Chine , described by Robinson (10, p. 88) and by Denaiffe 
(4, V- 295). Plants dwarf, 16 inches high, much branched, determinate; foliage 
medium-sized, light green; pods green, 5 inches long, % inch wide, round, slightly 
curved, stringy, parchmented when old, 5 or 6 seeds per pod; productive, mid¬ 
season; seeds yellow, bluish ring around hilum, h /% inch long, ovoid or subspherical 
in shape. Because of its anthracnose resistance and usefulness as a snap and 
green shell bean, this variety may be worthy of trial to supplant susceptible 
green shell types, such as Low’s Champion. According to Jarvis (6) Jaune de 
la Chine was formerly much cultivated in this country under the name Yellow 
Cranberry, but has now almost gone out of use. 
No. 301. Nain Parisien, described by Robinson (10, p. 59) and by Denaiffe 
(4, p. 282), has a dwarf plant of vigorous growth, determinate, dark green leaves, 
lilac-colored flowers; pods straight, cylindrical, 6 to 6J^ inches long, dark green 
with purple streaks that disappear on cooking, parchmented, “tringy; very pro¬ 
ductive, mid season; seeds large, flat, kidney-shaped, streaked dark purple on 
chamois. The purple streaking on the pods make this variety unsuitable from 
a market-garden standpoint to supplant susceptible varieties, such as Black 
Valentine, but the general horticultural characters of Nain Parisien make it 
more useful for hybridizing than the late coarse-vined South American sorts in 
group 2. 
RESISTANCE TO BACTERIAL WILT 
The information on bacterial wilt, as explained earlier, is insuffi¬ 
cient as a basis for judging relative susceptibility. However, 15 of 
those varieties inoculated by the “ cotyledon method,” which ap¬ 
peared least affected and are marked in Table II with the letter c, 
may on further testing prove to be somewhat resistant to this dis¬ 
ease. The results of the needle-prick inoculations on older plants 
are even less valuable for comparative purposes. Yield of inocu¬ 
lated and control plants would doubtless have given a better basis 
for comparison than the more or less artificial classification of infec¬ 
tion used in these preliminary experiments. Replication of tests 
and careful comparisons with controls would be necessary, however, 
to offset possible complicating factors, as natural spread of wilt on 
controls, infection by other diseases, and differences in time of 
maturity of the varieties. 
The extremely severe type of wilt produced by inoculations in the 
cotyledon stage is comparable, in the writers’ observations, to natu¬ 
rally occurring early season field cases resulting from seed infection, 
while the symptoms produced by later inoculations are similar to 
the more prevalent but individually less severe type resulting, appar¬ 
ently, from secondary spread in the field. Occasionally, however, 
general and severe wilting follows these late infections, as shown by 
the case illustrated in Plate 3, A. 
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