Home › Pests & diseases › Alternaria Leaf Blight
Alternaria Leaf Blight: signs and treatment in Jamaica
A fungal pathogen affecting carrots and other crops, thriving in warm, wet weather. PlantArmor's crop guides list alternaria leaf blight as a common problem on carrot.
Signs to look for
- Dark brown-black irregular spots on leaf margins
- Yellowing of surrounding tissue
- Browning and death of leaflets
What to do
Crops it affects
Questions growers ask
How do I recognise alternaria leaf blight?
A fungal pathogen affecting carrots and other crops, thriving in warm, wet weather. The signs to look for: Dark brown-black irregular spots on leaf margins. Yellowing of surrounding tissue. Browning and death of leaflets.
What should I do about alternaria leaf blight?
Apply Copper or Mancozeb. Avoid overhead irrigation. Ensure adequate spacing for airflow. Always read the product label and observe the registered rate, re-entry period and pre-harvest interval before you apply any pesticide.
Which crops are affected by alternaria leaf blight in Jamaica?
PlantArmor's crop guides list alternaria leaf blight as a common problem on carrot.
Check it in the field
PlantArmor's reference library works offline, so you can compare what you are seeing against it standing in the plot, then log the spray you use along with its re-entry and pre-harvest intervals. Free to use.
This description and treatment come from the same reference library the PlantArmor app uses in the field. Pesticide registrations and permitted uses change — always read the current product label and observe the stated rate, re-entry period and pre-harvest interval.