July 15,1925 
Bean Varietal Tests for Disease Resistance 
149 
3. Varieties apparently resistant to bacterial blight—Continued. 
101, London Horticultural, pole. 
107, Worcester Mammoth, pole. 
283, Incomparable, dwarf type, from France. 
325, Coco bicolore du Pape, pole type, from Fiance. 
351, Zebre gris, pole type, from France. 
395, S. P. I. 56584-A, Alubia, white kidney, dwarf type, from Guate¬ 
mala. 
454, S. P. I. 56582, Light tannish-pink beans, pole type, from Guate¬ 
mala. 
494, Meraviglia di Lione, dwarf type, from Italy. 
499, Varesotto, dwarf type, from Italy. 
528, Suzunari Ingen, pole type, from Japan. 
541, S. P. I. 51079, pole type, from Russia. 
544, S. P. I. 51082, pole type, from Russia. 
545, S. P. I. 51083, pole type, from Russia. 
549, S. P. I. 52191, dwarf type, from Uganda. 
556, S. P. I. 52198, dwarf type, from Uganda. 
565, S. P. I. 52201, pole type, from Uganda. 
577, S. P. I. 50259, pole type, from Urundi. 
578, S. P. I. 50260, pole type, from Urundi. 
589, S. P. I. 50846, pole type, from Urundi. 
615, S. P. I. 50870, pole type, from Urundi. 
621, S. P. I. 50875, pole type, from Urundi. 
626, S. P. I. 50879-A, pole type, from Urundi. 
635, S. P. I. 50886-B, pole type, from Urundi. 
636, S. P. I. 50886-C, pole type, from Urundi 
660, S. P. I. 46370, from Venezuela. 
661, S. P. I. 46365, from Venezuela. 
From the above lists it is seen that, out of a total of 663 varieties 
and strains tested, 65 are considered more or less resistant to anthrac- 
nose or bacterial blight, of which 5 are classified in Group 1, 27 in 
group 2, and 33 in group 3. Several of the blight-resistant varieties 
m group 3 which appeared resistant also to anthracnose in the field 
tests doubtless belong in group 1, but their apparent resistance has 
not been confirmed by greenhouse inoculation. However, their field 
behavior confirms the results of Burkholder (3) and others. 
Although a number of the varieties, particularly the first six in fist 2, 
are practically immune to anthracnose, no such striking behavior 
toward bacterial blight was observed. No variety came through 
the test-plot epidemics of both 1921 and 1923 with less than “slight” 
blight infection. The degrees of infection less than “ slight,” defined 
in Table I, occurred, therefore, mainly on other species of the genus. 
As Burkholder ( 3) has pointed out, resistance to blight is manifested 
in other ways than merely by reduction in number or size of the 
lesions. The incubation period is noticeably longer and the lesions 
enlarge more slowly in case of the resistant variety, enabling it to 
mature a good crop in spite of the disease. 
ADAPTABILITY AND DESCRIPTION OF ANTHRACNOSE AND 
BLIGHT RESISTANT TYPES 
The adaptability and commercial value of the few standard Ameri¬ 
can and European varieties, fisted in groups 2 and 3, are fairly well 
known and as shown presently, could probably with advantage 
supplant certain very susceptible varieties of the same type now being 
grown in this country. Little i3 known of the horticultural value of 
the Central American and East African resistant beans. They are 
now being increased, selected for uniformity, and studied from the 
