India’s second most important pulse, grown across 4 million hectares of Andhra Pradesh, Maharashtra, and Karnataka — the primary protein source of the Deccan farming household.
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. Fusarium Wilt
(Fusarium udum)
The Threat:
- Fusarium wilt in pigeon pea is functionally identical to chickpea wilt in mechanism — the soil-borne pathogen colonises the vascular system and blocks water transport.
- Its timing makes it even more devastating: the plant typically dies at the flowering and pod-fill stage, when 120–150 days of growth have been invested and the crop is within weeks of harvest.
- The pathogen persists in soil for years as dormant chlamydospores that are virtually impossible to eliminate through soil treatment.
The Solution:
- Grow wilt-resistant varieties — ICAR-ICRISAT hybrids ICPH-2671, and varieties Asha and BSMR-736, recommended for different Deccan zones.
- Treat seed with Trichoderma viride (Biological Fungicide — Beneficial Soil Fungus) @ 4 g/kg combined with Carboxin 37.5% (Systemic Fungicide — FRAC Group 7) @ 3 g/kg.
- Never grow tur on the same field consecutively; maintain a minimum 3-year rotation including a non-legume cereal.
- Deep summer ploughing with full sun exposure reduces surface inoculum.
2. Sterility Mosaic Disease
(eriophyid mite-transmitted virus complex)
The Threat:
- Sterility mosaic is unique among Indian crop diseases in its completeness of yield destruction — plants infected at the seedling stage produce perfectly healthy-looking foliage but absolutely no pods whatsoever, rendering the entire plant’s biomass worthless for grain.
- Secondary spread through the eriophyid mite Aceria cajani moves at alarming speed through close-planted fields — from an initial 5% infection, incidence can reach 95% within 4–6 weeks in epidemic years in Andhra Pradesh.
- The disease is impossible to identify from a distance and is frequently attributed to drought or nutritional causes.
The Solution:
- Grow resistant varieties recommended by ICAR-ICRISAT — BSMR-736 and ICPL-88039 are field-tolerant to the mite vector and the viral complex.
- Spray Dicofol 18.5 EC (Acaricide — Organochlorine, IRAC Group UN) @ 2 ml/litre at first symptom detection to suppress the mite vector population before secondary spread.
- Immediately rogue and destroy visibly symptomatic plants — those with mosaic-mottled, puckered leaves — before the mite population carrying the virus multiplies on them and moves to healthy plants.
3. Pod Fly (Melanagromyza obtusa) and Pod Bug Complex
The Threat:
- Pod fly females lay eggs through the pod wall and the larva feeds on the developing seed inside — the only external sign is a tiny entry puncture that is invisible without close examination.
- Pod bugs — including Clavigralla gibbosa and Riptortus spp. — pierce the pod wall and suck the developing grain directly, producing shrunken, discoloured seeds that lose both nutritional value and market price.
- Both pests are active throughout the pod formation and grain fill period (pod initiation to maturity), making continuous monitoring from 50% pod set essential.
- Combined losses reach 15–30%
The Solution:
- Use pheromone traps (Semiochemical — for pod fly adult monitoring) to monitor adult populations and time sprays to the peak egg-laying window.
- Grow early-maturing varieties that complete pod fill before the peak pod fly season.
- Spray Quinalphos 25 EC (Contact Insecticide — Organophosphate, IRAC Group 1B) @ 2 ml/litre or Lambda-cyhalothrin 5 EC (Contact Insecticide — Pyrethroid, IRAC Group 3A) @ 1 ml/litre at 50% pod set, with a second spray 10–12 days later if pod bug populations remain high.
4. Drought (Late Season)
The Threat:
- Pigeon pea’s 150–200 day growing season extends well into the post-monsoon dry period of October–December in peninsular India.
- Moisture deficit from November onward — when the monsoon has withdrawn but grain fill is still ongoing — compresses pod set and reduces the grain filling period, producing smaller, lighter grain.
- This constraint is most severe for long-duration varieties grown on shallow Deccan soils that exhaust their stored moisture by early November.
- Short-duration varieties are specifically recommended to avoid this window.
The Solution:
- Grow short-duration varieties recommended by ICAR-IIPR — ICPL-87119 and Pusa-992 mature in 120 days, completing grain fill before the stored soil moisture is fully depleted.
- Practice in-situ moisture conservation through tied ridges and field bunds.
- Intercrop with sorghum or maize as a risk distribution strategy — the cereal component provides income security if the pigeon pea is drought-affected.
- Apply Zinc Sulphate (ZnSO₄) 21% (Micronutrient Fertiliser) @ 25 kg/ha as a basal dose — adequate zinc enhances drought tolerance by supporting enzyme activity under stress.
5. Phytophthora Blight
(Phytophthora drechsleri f.sp. cajani)
The Threat:
- Phytophthora blight is a water mould disease — not a true fungus — that attacks the collar region of the plant after heavy rain or waterlogging events, causing sudden, complete wilting in circular patches that spread outward from the initial infection point.
- On black, poorly drained soils of Maharashtra and AP, the disease can kill entire patches of plants within 3–4 days of a waterlogging event.
- It is most damaging during the kharif season when intermittent heavy rain events create repeated waterlogging cycles that restart the infection cycle.
The Solution:
- Sow on raised beds in heavy black soils — this structural practice is the single most effective management tool and requires no chemical input.
- Treat seed with Metalaxyl 35 WS (Systemic Fungicide — Phenylamide, FRAC Group 4) @ 3 g/kg.
- At first symptom appearance, drench the soil around affected plants with Metalaxyl + Mancozeb 72 WP (Systemic + Contact Fungicide combination — FRAC Groups 4 and M3) @ 2 g/litre to prevent lateral spread to neighbouring healthy plants.
Ph.D. in Agricultural Engineering.