^ V3^'Ab
COMMON BEAN DISEASES
Anthracnose.—Widespread and destructive. Somewhat
round sunken spots with reddish edges on the young pods.
(Fig. 1, A.) Red spots or streaks on veins on under sides
of leaves and rusty-looking spots on the ripe seed. Spots
enlarge on way to market.
Control: Use disease-free seed. Plant where disease
has not occurred the previous year.
Bacterial blight.—Widespread. Large irregular brown
spots with a bright yellow border, often covering the greater
part of the leaf. Infection first visible as tiny water-soaked
spots on under side of leaf. Pods show irregular water-
soaked areas, becoming reddish and sunken. (Fig. 1, B.)
These spots develop during transit. Stems show longitudinal reddish streaks.
Control: Use western-grown seed if possible, or select
seed from blight-free plants. If practicable avoid cultivating and picking when plants are wet. Do not use bean
straw as fertilizer or feed.
Mosaic. — Widespread. Destructive on susceptible
varieties. Plants dwarfed. Leaves mottled and sometimes distorted. Pods few and poorly filled.
Control: Use seed from disease-free plants.
Powdery mildew. — Widely distributed. Plants
dwarfed. White mealy patches on leaves, stems, and
pods. Foliage later turns yellow.
Control: Dust with flowers of sulphur or spray with
potassium sulphide at the rate of 3 ounces in 10 gallons
of water.
Root rot.—Present wherever beans are grown. Destruction of skin of the underground parts of the plant. Often
general throughout the entire field.
Control: No remedial measures known.
Rust.—Common and often destructive. Occurs on all
parts above ground, but most conspicuously on leaves.
On foliage the rust appears as little brown pimples which
later turn black.
Control: Grow resistant varieties. The following varieties have shown resistance in certain sections: Refugee,
Early Refugee, Hodson Wax, Wardwell, Hodson Green
Pod, and Dwarf Horticultural.
In addition to the diseases listed above, growers in certain sections of the Southern States may encounter the
troubles known as white mold, southern blight, and soil
rot. (Fig. 1, C.) Presence of these diseases in the field
may result in " nesting " in transit unless careful culling
is practiced when the beans are prepared for shipment.
"Nesting" may also be caused by the common bread
mold. As is the case with white mold, southern blight,
and soil rot, the development of this organism, which is
present practically everywhere, is favored by warm, moist
conditions.
For further information consult your county agent or
write your State extension service or the United States
Department of Agriculture.
SAVE THE BEANS
Nesting" caused byoiholdsJurijg transit
*-.&'■*
^w
UNITED STATES DE
, E&t OF AGRICULTURE
MISCELLiW^nS*f,g^ICATION NO. 16
BURljJrtl OF PLANT INDUSTRY
AND
OFFICE OF COOPERATIVE EXTENSION WORK
Washington, D. C, February, 1928
8 6142 u. S. GOVERNMENT PRINTING OFFICE: 1028
^ V3^'Ab
COMMON BEAN DISEASES
Anthracnose.—Widespread and destructive. Somewhat
round sunken spots with reddish edges on the young pods.
(Fig. 1, A.) Red spots or streaks on veins on under sides
of leaves and rusty-looking spots on the ripe seed. Spots
enlarge on way to market.
Control: Use disease-free seed. Plant where disease
has not occurred the previous year.
Bacterial blight.—Widespread. Large irregular brown
spots with a bright yellow border, often covering the greater
part of the leaf. Infection first visible as tiny water-soaked
spots on under side of leaf. Pods show irregular water-
soaked areas, becoming reddish and sunken. (Fig. 1, B.)
These spots develop during transit. Stems show longitudinal reddish streaks.
Control: Use western-grown seed if possible, or select
seed from blight-free plants. If practicable avoid cultivating and picking when plants are wet. Do not use bean
straw as fertilizer or feed.
Mosaic. — Widespread. Destructive on susceptible
varieties. Plants dwarfed. Leaves mottled and sometimes distorted. Pods few and poorly filled.
Control: Use seed from disease-free plants.
Powdery mildew. — Widely distributed. Plants
dwarfed. White mealy patches on leaves, stems, and
pods. Foliage later turns yellow.
Control: Dust with flowers of sulphur or spray with
potassium sulphide at the rate of 3 ounces in 10 gallons
of water.
Root rot.—Present wherever beans are grown. Destruction of skin of the underground parts of the plant. Often
general throughout the entire field.
Control: No remedial measures known.
Rust.—Common and often destructive. Occurs on all
parts above ground, but most conspicuously on leaves.
On foliage the rust appears as little brown pimples which
later turn black.
Control: Grow resistant varieties. The following varieties have shown resistance in certain sections: Refugee,
Early Refugee, Hodson Wax, Wardwell, Hodson Green
Pod, and Dwarf Horticultural.
In addition to the diseases listed above, growers in certain sections of the Southern States may encounter the
troubles known as white mold, southern blight, and soil
rot. (Fig. 1, C.) Presence of these diseases in the field
may result in " nesting " in transit unless careful culling
is practiced when the beans are prepared for shipment.
"Nesting" may also be caused by the common bread
mold. As is the case with white mold, southern blight,
and soil rot, the development of this organism, which is
present practically everywhere, is favored by warm, moist
conditions.
For further information consult your county agent or
write your State extension service or the United States
Department of Agriculture.
SAVE THE BEANS
Nesting" caused byoiholdsJurijg transit
*-.&'■*
^w
UNITED STATES DE
, E&t OF AGRICULTURE
MISCELLiW^nS*f,g^ICATION NO. 16
BURljJrtl OF PLANT INDUSTRY
AND
OFFICE OF COOPERATIVE EXTENSION WORK
Washington, D. C, February, 1928
8 6142 u. S. GOVERNMENT PRINTING OFFICE: 1028
