Early and late leaf spot of peanut
Brown spots with a yellow ring, or dark brown to black spots on the leaf underside, and the leaves drop early.
Crops it strikes
What you see
When to act
From about 30 days after sowing, check the lower leaves every week. Start sprays when the first spots show on the lower leaves in wet weather, and keep the leaves covered while the pods fill.
What to spray
- MancozebFRAC M03ShopeeLazada
- ChlorothalonilFRAC M05ShopeeLazada
- Thiophanate methylFRAC 1ShopeeLazada
- Copper hydroxideFRAC M01ShopeeLazada
Active ingredients only, never brands. The FRAC group tells how it works: switch to a different group next time, so the disease does not learn to survive it. Spray only when the damage is worth the cost, and only with products registered with the Fertilizer and Pesticide Authority for your crop. Follow the label. The Shopee and Lazada links only show who sells something with that active ingredient, not a recommendation of any seller or product.
Resistance: Peanut leaf spot fungi became resistant to benomyl and its kin (FRAC 1) within a few seasons of heavy use in several countries. Turn thiophanate methyl with chlorothalonil or mancozeb and never spray it alone season after season.
How to prevent it
- Rotate for two to three years with corn, rice or other grains, and bury or remove peanut residue after harvest.
- Pull volunteer peanut plants, which carry the fungus from one season to the next.
- Plant a tolerant variety where one suits your area, and plant early in the season when you can.
- Space the rows so the canopy dries fast, and feed the crop with balanced fertilizer and enough calcium.
Where this comes from
Not sure it is this one?
Many diseases look alike. Send a photo to Anee, the smart farm technician in anee.io. She reads it with your crop, its age and the weather, and tells you what it most likely is and what to do first. In Tagalog or English.