A nitrogen-fixing legume that rarely needs nitrogen fertiliser but is highly vulnerable to early and late leaf spot, which can strip a crop of 50% of its yield without ever killing a plant.
- Grown in
- Nigeria, Senegal, India, China, USA
- Season
- 90–140 days, rain-fed
- Soil & pH
- Light sandy loam with good calcium, pH 5.5–7.0
What to scout for on Groundnut / Peanut
- Dark circular spots with yellow halos on lower leaves
- Orange rust pustules on leaf undersides late in the season
- Rosette stunting spread by aphids
- Poor pod fill from calcium shortage in the pegging zone
Diseases that attack Groundnut / Peanut
Leaf Spot
Septoria, Cercospora, Alternaria spp.
Rust Disease
Puccinia, Uromyces spp.
Aphid Infestation
Aphidoidea
Products you can buy for Groundnut / Peanut
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.
Chlorothalonil 75% WP
Active ingredient: Chlorothalonil
- Dose:
- 2 g per litre (1.5–2 kg/ha)
- Interval:
- Every 7–10 days
- PHI:
- 7 days
Backbone protectant for Septoria and Cercospora leaf spots. Full leaf coverage, including undersides, is essential.
Mancozeb 80% WP
Active ingredient: Mancozeb
- Dose:
- 2.5 g per litre
- Interval:
- Every 7 days
- PHI:
- 7 days
Adds zinc and manganese nutrition alongside disease control.
Azoxystrobin 23% SC
Active ingredient: Azoxystrobin
- Dose:
- 1 ml per litre (500 ml/ha)
- Interval:
- Every 14 days, maximum 2 per season
- PHI:
- 3–7 days
Strong translaminar movement. Always tank-mix or alternate with a multi-site to protect the QoI group.
Copper hydroxide 77% WP
Active ingredient: Copper hydroxide
- Dose:
- 2 g per litre
- Interval:
- Every 10 days
- PHI:
- 1–3 days
Use when bacterial leaf spot cannot be ruled out — copper covers both bacterial and fungal spotting.
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.
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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