Carrot leaf blight
Dark brown spots with yellow edges start on older leaves and stalks, then join until the tops blacken and dry as if scorched.
Crops it strikes
What you see
When to act
Check the older leaves every week from about six weeks after sowing. Start protectant sprays when dark spots with yellow edges show on a few plants in warm, wet weather, so the tops stay strong enough to pull at harvest.
What to spray
- ChlorothalonilFRAC M05ShopeeLazada
- IminoctadineFRAC M07ShopeeLazada
- Copper hydroxideFRAC M01ShopeeLazada
- Bordeaux mixtureFRAC M01ShopeeLazada
- Cuprous oxideFRAC 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.
How to prevent it
- Sow clean seed. Soak doubtful seed in hot water at 50 degrees Celsius for 20 minutes before sowing.
- Rotate for two to three years away from carrot and celery, and plow under or remove the tops after harvest.
- Thin the rows so air moves, and water in the morning by furrow or at the base.
- Feed the crop evenly through the season. Stressed, hungry plants blight first.
- Grow a tolerant variety where one suits your area.
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.