Septoria late blight of celery
Small yellow spots turn brown with tiny black dots inside and spread over leaves and stalks until the leaves dry up.
Crops it strikes
What you see
When to act
From transplanting, check the older leaves every week for small brown spots dotted with tiny black specks. Start protectant sprays at the first spots, and from transplanting in wet weather or in fields that had it before.
What to spray
- ChlorothalonilFRAC M05ShopeeLazada
- MancozebFRAC M03ShopeeLazada
- PropinebFRAC M03ShopeeLazada
- Copper hydroxideFRAC M01ShopeeLazada
- ThiramFRAC M03ShopeeLazada
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. Seed stored for two years or more seldom carries the live fungus, or soak fresh seed in hot water before sowing.
- Throw out any seedling with spots before transplanting.
- Water at the base, not over the leaves, and space the rows so the plants dry fast.
- Rotate for two to three years away from celery and parsley, and remove old celery leaves after harvest.
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.