BARLEY

Grown across 0.7 million hectares of Rajasthan, UP, and Bihar as a rabi cereal; valued for malt, feed, and increasingly for human nutrition.

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

(Blumeria graminis f.sp. hordei)

The Threat:

  • Powdery mildew appears as a white, floury coating on leaves and leaf sheaths during cool, humid weather (15–22°C).
  • As colonies expand, they reduce the photosynthetic capacity of the flag leaf, which is critical for grain fill in barley.
  • Severe infections can cover the flag leaf, shortening the grain-fill period and producing small, shrunken grains with poor test weight.
  • Malt barley is especially sensitive, as low test weight grain is rejected by breweries.
  • Yield losses range from 8–15% in epidemic years.

The Solution:

  • Grow resistant varieties recommended by ICAR-IIWBR — DWRB-123 and BH-902.
  • At first symptom appearance on lower leaves, apply:
    • Wettable Sulphur 80 WP (Contact Fungicide — Inorganic Sulphur, FRAC Group M2) @ 3 g/litre (for mild to moderate infection)
    • Propiconazole 25 EC (Systemic Fungicide — Triazole, FRAC Group 3) @ 1 ml/litre (for severe infection)
  • Avoid dense sowing to reduce canopy humidity.
  • Apply a second spray 10–14 days later if cool, humid conditions persist.

2. Loose Smut

(Ustilago nuda var. hordei)

The Threat:

  • Loose smut is a seed-borne disease where the entire spike is replaced by olive-brown to black spores at heading.
  • The spore mass is exposed and disperses immediately, infecting neighbouring healthy plants and continuing the cycle.
  • Infected plants appear normal until heading, making the disease invisible without seed testing.
  • Causes 5–10% yield loss and increases over seasons if infected seed is reused.

The Solution:

  • Treat seed before sowing with Carboxin 37.5% + Thiram 37.5% DS @ 3 g/kg.
  • This treatment controls both internally seed-borne and surface pathogens.
  • Use certified, disease-free seed from reliable sources.
  • This low-cost treatment provides full-season protection.
  • Never use seed from smut-affected fields.

3. Yellow Rust

(Puccinia striiformis f.sp. hordei)

The Threat:

  • Stripe rust in barley behaves similarly to wheat, spreading rapidly in cool, humid January–February conditions through wind-dispersed spores.
  • Produces yellow stripe-like pustules along leaf veins, reducing photosynthetic area during grain filling.
  • New virulent races can overcome resistant varieties quickly, making resistance unreliable without annual updates.
  • Causes 8–20% yield loss in susceptible varieties during epidemic years.

The Solution:

  • Follow ICAR-IIWBR race-resistance advisories each year before selecting varieties.
  • At the flag-leaf stage, spray Propiconazole 25 EC @ 1 ml/litre in susceptible crops.
  • Protecting the flag leaf during grain fill is critical for yield.
  • Apply a second spray after 10–14 days if disease pressure remains high.

4. Scald Disease

(Rhynchosporium commune)

The Threat:

  • Scald produces pale, water-soaked lesions with dark margins, giving a “scalded” appearance.
  • Primarily seed-borne and spreads through infected seed and rain splash in cool, wet conditions.
  • Progresses up the canopy in humid seasons, reducing photosynthesis in upper leaves.
  • Dense, lodging-prone crops are more severely affected due to prolonged leaf wetness.
  • Often misdiagnosed as early-stage leaf rust.

The Solution:

  • Treat seed with Iprodione 25 WP @ 2 g/kg before sowing.
  • Use scald-resistant varieties as per state recommendations.
  • Maintain proper spacing (22.5 cm row spacing) to improve air circulation.
  • In high-rainfall areas, apply Iprodione 25 WP @ 1.5 g/litre at first lesion appearance.

5. Drought at Grain Filling

The Threat:

  • Moisture deficit during grain fill is the main yield-limiting factor in rain-shadow barley zones of western Rajasthan and dryland Bihar.
  • When soil moisture is exhausted early, the grain-fill period shortens, producing small, lightweight grains.
  • This reduces both yield and grain quality (test weight).
  • Malt barley with low test weight is downgraded or rejected at procurement.
  • Yield losses from grain shrinkage can reach 10–15% in severe years.

The Solution:

  • Grow early-maturing, drought-escape varieties — RD-2552 and K-508.
  • Provide one protective irrigation at the booting stage (10–12 days before heading).
  • Practice conservation tillage (zero/minimum tillage with residue retention) to conserve soil moisture.
  • Use mulching with organic material to reduce evaporation during grain filling.
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