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Scarlet runner bean

Crop details

Scarlet runner bean

Phaseolus coccineus
Family: Fabaceae

Quick stats

Family Fabaceae
Typical harvest 1.2 t/ha
Varieties 1
Pests & diseases 6
Seasons 1

Crop profile

Growth habit climber
Days to harvest 110-180
Main uses Pulse; vegetable
Pollination insect
Origin / where it grows Highlands; cool tropics

Weather, soil & spacing

Best temperature 15–22 °C
Rainfall 700–1200 mm/yr
Altitude 1200–2800 m
Best pH 6–7
Soil type Fertile loam
Row spacing 90 cm
Plant spacing 45 cm
Planting depth 3 cm
Seed rate 50 kg/ha
Nursery days

Simple notes for farmers

About the crop: This crop has a growth habit described as "climber". You can normally start harvesting about 110-180 days after planting, depending on care and variety.

Main use: Farmers mostly grow this crop for pulse; vegetable.

Pollination: This crop is mainly pollinated by insect. Keeping flowers healthy and having insects like bees in the field helps improve fruit set and yields.

Where it grows: Highlands; cool tropics It is grouped under: Legumes & Pulses.

Best climate: This crop does well in warm areas where the temperature is usually between 15 and 22 degrees Celsius. It prefers places that receive around 700 to 1200 millimetres of rain in a year. It can grow from near sea level up to about 2800 metres above sea level.

Soil: The crop grows best in slightly acidic to near neutral soils, with a pH of about 6 to 7. It does well in fertile loam. Good drainage is important, so avoid waterlogged spots.

Plant spacing: Plant in rows about 90 centimetres apart, and leave about 45 centimetres between plants in the row. This gives each plant enough space for roots and canopy to spread.

Planting depth: Dig planting holes or furrows about 3 centimetres deep so the roots sit firmly in the soil but are not buried too deep.

Seed or planting material: Use around 50 kilograms of seed or planting material per hectare. Spread or plant evenly so the field has a good stand without being overcrowded.

Farmer guide (mwongozo wa mkulima)

Planting: Sow at onset of cool/wet season; provide sturdy trellis or poles.
Transplanting: Direct seed preferred; transplants may check growth.
Irrigation: Keep evenly moist; avoid drought at flowering and pod set.
Fertigation: Minimal N; focus on P and K; ensure molybdenum for nodulation where deficient.
Pest scouting: Scout for rusts and pod borers; maintain airflow; rotate fields.
Pruning: Train vines up supports; remove excessive laterals if overcrowded.
Harvest: Pick fresh pods regularly; for dry seed, harvest when pods brown and seeds hard.
Postharvest: Dry grain to ≤12% moisture; store cool/dry; ventilate fresh pods.

Nutrient schedule (mbolea kwa hatua)

# Stage DAP Product Rate Targets (kg/ha) Notes
1 Basal 0 NPK 17-17-17 60 kg/ha N: —, P₂O₅: —, K₂O: — Place away from seed to protect inoculant
2 Early pod set (if K low) 40 Sulfate of potash (SOP) 40 kg/ha N: —, P₂O₅: —, K₂O: 20 Skip if soil K adequate

Nutrient requirements

Nutrient Stage Amount Unit
N Basal 0 kg/ha
P₂O₅ Basal 25 kg/ha
K₂O Basal 20 kg/ha
N Topdress 0 kg/ha
P₂O₅ Topdress 0 kg/ha
K₂O Topdress 20 kg/ha

Field images (picha shambani)

Scarlet runner bean
Name Country Maturity Traits
Highland Runner KE 150 Cool-tolerant vine
Stage Product Rate (kg/ha) Notes
Basal NPK 17-17-17 60 Or equivalent P+K sources
Pod set Sulfate of potash (SOP) 40 Apply only if K is deficient
Name Type Symptoms Management
Rust disease Rusty pustules Airflow; timely spray if needed
Rust (Uromyces spp.) disease Rusty pustules on leaves/stems Resistant types; improved airflow; timely fungicides if severe
Angular leaf spot disease Angular lesions on leaves Clean seed; rotation; residue management
Pod borers (Helicoverpa spp.) pest Feeding in flowers/pods Flower–pod scouting; threshold-based control; timely picking
Aphids pest Curling leaves; honeydew Conserve predators; control ants; soft insecticides if needed
Root rots (Pythium/Rhizoctonia) disease Damping-off; root lesions Well-drained beds; seed treatment; avoid overwatering
System Typical Min Max Notes
rainfed highland 1.2 0.6 2 Higher with improved trellising and disease control
Country Region Planting Harvest
KE Highlands Mar–Apr Jul–Oct
Country Region Suitability
KE Highlands High