A widely grown rabi vegetable-pulse of the north Indian plains and hills, valued both for fresh consumption and dry grain — and one of the fastest-responding crops to good management.
5 Major Threats and Their Control
For educational purposes only. Recommended crop varieties are location-specific. Always verify chemical and variety recommendations with your local KVK or State Agriculture Department.
1. Powdery Mildew
(Erysiphe pisi)
The Threat:
- Powdery mildew is the most consistently damaging disease of peas in north India.
- Appears as a white, floury coating on leaves, stems, and pod surfaces during warm, dry spells of late February and early March.
- Thrives under low humidity (40–70%) and moderate temperatures (18–25°C), making it severe during otherwise favorable weather.
- Infected pods have reduced seed fill — seeds beneath infected pod surfaces are shrunken and discoloured.
- In susceptible varieties, the entire crop can appear covered in white powder within 10–15 days of first symptoms.
- Losses can reach up to 30%
The Solution:
- Grow resistant varieties recommended by ICAR-IIPR — Arkel, AP-3, and VL-Matar-42 carry field-level mildew resistance.
- At first symptom appearance, spray wettable Sulphur 80 WP (Contact Fungicide — Inorganic Sulphur, FRAC Group M2) @ 3 g/litre or Carbendazim 50 WP (Systemic Fungicide — Benzimidazole, FRAC Group 1) @ 1 g/litre.
- Apply a second spray 10 days later if warm, dry weather persists.
2. Downy Mildew
(Peronospora viciae)
The Threat:
- Downy mildew affects peas in the early season.
- Cool, wet conditions at the seedling stage produce yellowing on the upper leaf surface with grey-purple downy sporulation on the underside.
- Systemically infected seedlings remain permanently stunted, never reaching normal plant height or pod set, even if the disease does not spread further.
- The pathogen spreads through infected seed into new fields and via airborne sporangia within a season.
- Dense, poorly ventilated canopies are disproportionately affected.
The Solution:
- Treat seed with Metalaxyl 35 WS (Systemic Fungicide — Phenylamide, FRAC Group 4) @ 3 g/kg before sowing.
- Maintain adequate plant spacing — 30 × 7 cm — to improve canopy air circulation.
- At first symptom on lower leaves, spray Metalaxyl + Mancozeb 72 WP (Systemic + Contact Fungicide combination — FRAC Groups 4 and M3) @ 2 g/litre.
3. Pea Aphid
(Acyrthosiphon pisum)
The Threat:
- Dense pea aphid colonies settle on growing tips and leaf undersides in warm January spells.
- Aphids extract photosynthate, distort new growth, and transmit Pea Enation Mosaic Virus (PEMV) and Bean Yellow Mosaic Virus (BYMV) simultaneously.
- Virus transmission continues throughout the infestation, adding long-term viral damage to direct feeding harm.
- Natural enemies — particularly parasitic wasps of the Aphidius genus and seven-spotted ladybirds — usually keep populations below threshold in cool, normal January weather, but fail in warm years.
The Solution:
- Scout from 25 days after sowing, examining growing tips and leaf undersides for aphid colonies.
- Assess natural enemy activity before spraying — if ladybirds and parasitic wasps are present, withhold spraying.
- Apply Dimethoate 30 EC (Systemic Insecticide — Organophosphate, IRAC Group 1B) @ 1.5 ml/litre only when colony counts exceed 30 aphids per plant and no natural enemies are visible.
4. Root Rot
(Fusarium solani, Pythium spp.)
The Threat:
- Root rot complex causes damping-off in seedlings and crown rot in established pea plants in fields with a history of continuous pea cultivation.
- Pathogens build up in the soil over successive seasons under monoculture.
- Damage appears as patchy, circular areas of dead or dying plants, often with reddish discoloration at the root and crown when uprooted.
- Condition worsens with heavy rain after sowing on poorly drained heavy soils and in compacted soil horizons that restrict root growth and drainage.
The Solution:
- Treat seed with Trichoderma harzianum (Biological Fungicide — Beneficial Soil Fungus) @ 4 g/kg combined with Thiram 75 WS (Contact Fungicide — Dithiocarbamate, FRAC Group M3) @ 3 g/kg.
- Avoid growing peas on the same field more than once in 3 years.
- Use raised beds with open drainage furrows in heavy soils.
- Apply FYM @ 3 t/ha to improve soil structure and biological activity, which naturally suppresses root rot pathogens.
5. Frost Injury at Flowering
The Threat:
- In the hill zones of Uttarakhand and Himachal Pradesh above 1,500 m elevation, frost at the flowering stage causes pollen sterility, flower drop, and pod abortion overnight.
- This weather-determined event can eliminate 20–50% of the crop’s pod set in a single cold night.
- The risk window is predictable — January 5–20 is typically the hardest frost fortnight across most north Indian hill districts.
- Varieties and sowing calendars can be adjusted to completely avoid this loss.
The Solution:
- Sow early — in late September to early October in hill areas — to ensure flowering is completed before January 5.
- This sowing-date adjustment, which requires no additional inputs, eliminates frost risk entirely in most years.
- Apply anti-transpirant (Physical Crop Protection Agent) — Kaolin 5% — as a foliar spray 2 days before a forecast frost event.
- This reduces the rate of tissue temperature drop and can prevent frost damage to open flowers during the critical early morning hours.
Ph.D. in Agricultural Engineering.