The rust crop. Stem, leaf and stripe rusts evolve into new races faster than breeders can release varieties, which makes weekly scouting during stem elongation non-negotiable.
- Grown in
- India, China, Russia, Ethiopia, Germany, Sweden
- Season
- Cool season, 110–150 days
- Soil & pH
- Well-drained loam, pH 6.0–7.5
What to scout for on Wheat
- Orange-brown pustules in rows along the leaf — leaf rust
- Yellow stripe pustules between veins — stripe rust
- Powdery white colonies at the base of the canopy
- Pale, thin stands from nitrogen shortfall at tillering
Diseases that attack Wheat
Powdery Mildew
Erysiphales spp.
Rust Disease
Puccinia, Uromyces spp.
Nitrogen Deficiency
Abiotic — nutrient stress
Products you can buy for Wheat
Typical registered products for the diseases above, with active ingredient, mixing rate, spray interval and pre-harvest interval. Rotate FRAC/IRAC groups to avoid resistance.
Tebuconazole 25% EC
Active ingredient: Tebuconazole
- Dose:
- 1 ml per litre (500 ml–1 L/ha)
- Interval:
- Every 14–21 days, 2 sprays per season
- PHI:
- 21–35 days on cereals
The standard cereal-rust curative. Apply at first pustule, and again at flag-leaf if pressure continues.
Propiconazole 25% EC
Active ingredient: Propiconazole
- Dose:
- 1 ml per litre
- Interval:
- Every 14–21 days
- PHI:
- 21–30 days
Widely used on coffee leaf rust and cereal rusts; rotate with a strobilurin.
Azoxystrobin + cyproconazole
Active ingredient: Azoxystrobin 20% + Cyproconazole 8%
- Dose:
- 1 ml per litre
- Interval:
- Every 21 days, 1–2 per season
- PHI:
- 30 days
Built-in two-mode mixture — the safest way to slow rust resistance in intensive systems.
Copper oxychloride 50% WP
Active ingredient: Copper oxychloride
- Dose:
- 3 g per litre
- Interval:
- Every 14 days through the rainy season
- PHI:
- 3–5 days
Standard preventive base for coffee leaf rust in smallholder systems.
Wettable sulphur 80% WG
Active ingredient: Sulphur
- Dose:
- 2–3 g per litre (2–3 kg/ha)
- Interval:
- Every 10–14 days
- PHI:
- 1 day
Cheapest effective option. Do not apply above 32 °C or within 14 days of an oil spray — it will burn foliage.
Potassium bicarbonate
Active ingredient: Potassium bicarbonate
- Dose:
- 5 g per litre + 1 ml non-ionic wetter
- Interval:
- Every 7 days while pressure lasts
- PHI:
- 0 days
Collapses existing colonies on contact. Ideal for kitchen gardens and pre-harvest sprays.
Doses shown are typical registered field rates. Always read the product label, confirm the product is registered for your crop and country, respect the pre-harvest interval (PHI), and wear the protective equipment the label specifies. PlantWatch AI provides agronomic guidance, not a legal spray recommendation.
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