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WYO 1966« 
A NEW PINTO BEAN 
December 1965 
Bulletin 433 
^ arren L. Smith 
Agricultural Experiment Station, University of Wyoming, Laramie 
WYO 166 -A  NEW PINTO BEAN 
Warren L. Smith* 
A new interspecific hybrid pinto PEDIGREE OF WYO 166 
bean, Wyo 166, developed from a 
cross made in 1952 (2), was re­ Phaseolus vulgaris L., variety 
leased by the University of Wyo­ Golden Pinto, which is well adapt­
ming in 1965. The breeding pro­ ed to Wyoming growing conditions, 
gram sought to obtain resistance was crossed with Phaseolus coc-
to Fusarium root rot, a widespread cineus L., variety White Runner, 
bean disease. Seed was produced an ornamental garden bean. White 
from 21 of 117 crossing attempts, Runner was selected because of its 
2 of which entered into the devel­ resistance to Fusarium root rot. 
opment of Wyo 166. The Fi was then back-crossed to 
the pinto parent, and Wyo 166 was 
Annual production and value of selected from the progeny. 
dry edible beans in Wyoming from 
1954 through 1961 show average 
yearly planting in excess of 60,000 BREEDING BEHAVIOR 
acres with a gross yearly income The Fi generation from the ori­
in excess of 5V& million dollars ginal crosses were male-sterile and 
(1). The largest acreages are in red-flowered. By back-crossing to 
irrigated areas of Park, Goshen, the Pinto as the pollen parent, line 
Big Horn, Washakie, Fremont and continuation was possible. Pro­
Platte counties. Laramie, Converse geny from the back-cross were 
and Natrona counties are also bean approximately one-half red-flow­
producing areas. ered and one-half white-flowered. 
Seed from the white-flowered 
plants produced half red and half 
white-flowered progeny (2). Many 
seed colors were produced in the 
early generations including all 
white and all black; however, 
selection 166 produced all pinto-
colored seed; blossoms were all 
white-flowered from the third 
through the sixth generations. In 
the seventh, eighth and ninth 
generations an occasional variegat­
ed black seed was produced, and 
in one instance red-flowered plants 
were noted. The seed released in 
1965 is the tenth generation from 
W y o  1 6 6  the original cross. 
•Superintendent, University of Wyoming Agricultural Substation, Powell. 
DESCRIPTION AND YIELD RESULTS 
Wyo 166, a semi-vining, robust Seed of Wyo 166 is slightly 
plant matures in 94 to 99 days, larger than that .of UI-111. In 
about 3 days later than the Pinto trials at Powell, Wyo 166 seed 
UI (University of Idaho)-111. It averaged 76 per ounce, UI-111 
has a more extensive root system averaged 83. Disease studies in­
and is more viney than UI-111. dicate Wyo 166 is not resistant 
The more extensive root system to Fusarium root-rot. Virus dis­
may render it better adapted for ease resistance has not been 
growing on coarse-textured soils. determined, although common mo­
Wyo 166 recovered more rapidly saic symptoms have been noted. 
than UI-111 after a severe hail UI-111 is the present standard 
July 9, 1963, at the Powell Sub­ pinto variety of the region and is 
station. Wyo 166 produced 27 compared with Wyo 166 in region­
sacks per acre and UI-111 produc­ al tests (Table 1) and local tests 
ed 20 sacks. (Table 2). 
TABLE 1. YIELD COMPARISONS OF WYO 166 AND OF UI-111 AT 11 CO­
OPERATIVE DRY-BEAN NURSERIES*, 1 963, AND 1964, IN POUNDS 
PER ACRE. 
-3 ® I e ~ c' ® 
2 
^ 5 |5 |S  3 
z 
- 0>)•  ^-  x0)  * » 
0 C E © o" ® 2* — 
1 =§ i-s 5-2 i r 
Variety * (j X 
Wyo 166 3225 3225 1742 2041 2149 2041 
UI-111 3245 2800 3005 1978 1791 1934 
5 6 2 
s.  -s~ -nS ~*_  O>»  £>  <3  ̂ 
I 5 S 5 S 5 - 2 * 
z C. o * = I i.2 
d> s s = S | ® c 5 
? S-a J-a | ! 
•E  £ 6 Q K
O  " 
Wyo 166 2283 3026 1746 2988 2630 2535 
UI-111 2278 3213 1752 3001 2378 2489 
"The Cooperative Dry-Bean Nursery reports have been compiled annually by 
Marshall J. LaBaron, associate agronomist and superintendent of the Twin Palls 
Experiment Station, University of Idaho. 
Breeder seed plot 
TABLE 2. YIELD IN POUNDS PER ACRE OF WYO 166 AND OF Ul-lll AT 
POWELL AND TORRINGTON, WYO. AND AT SIDNEY AN D HUNTLEY, 
MONT. 
Powell (5)* Torrington (3) Sidney (2) Huntley (1) Ave. Yield 
Ibs./A Ibs./A Ibs./A lbs./A four sta. 
Wyo 166 3406 2197 2149 2041 2724 
Ul-lll 3466 1991 1791 1978 2624 
•The figure in parenthesis indicated the number of years varieties were tested at 
each location. 
Because of an occasional off- Foundation or Registered seed. 
color seed, Wyo 166 will be certi­ Certified seed cannot be used to 
fied on a limited-generation basis. produce certified seed. Seed not 
One generation each of Breeder's eligible for certification will not be 
Foundation, Registered, and Certi­ recognized as Wyo 166 by releas­
fied will be recognized. Certified ing station. 
seed can be produced only from 
Acknowledgment is made to Charles W. McAnelly, associate professor of plant 
pathology and horticulture; Robert H. Sackett, manager of Seed Certification 
Service, and to Leon H. Paules, head of division of agricultural substation, for their 
aid in study and release of this variety. 
REFERENCES 
1. McAnelly, C. W., and Bridgmon, G. H. 
Dry Bean Variety Trials in Wyoming 1957 through 1962. 
University of Wyoming Bulletin 407. 
2. Smith, W. L. 
Three Interspecific Hybrid Beans. Western Society of Crop Science. 
Abstracts, 1959 Annual Meeting, July 1959. 
N. W. Hilston, Director 
Agricultural Experiment Station 
University of Wyoming, Laramie 82070 
12-65—2M—3