Also called Phytophthora infestans, it is a dangerous fungus which attacks mainly tomato and potato.
It spreads very fast.
Attacking leaves, fruits and stems.
It appears when humidity is high.
The first symptoms are white powder and black veins on the lower side of the leaves.
If you are using head irrigation with sprinklers,
you are increasing the chance of the appearance and spreading out of this fungus.
If you can, it is better to use drip irrigation.
For further information about this, read this post, and this post also.
There are 2 ways to eliminate late blight: Chemical, and organic.
Chemical:
Active ingredients:
Best pesticides for Late blight,
| Metalaxyl/Mefenoxam |  |
| Mancozeb |  |
| Cymoxanil | |
| Propamocarb |  |
| Iprovalicarb | |
| Dimethomorph |  |
| Famoxadone | |
| Fenamidone |  |
Organic:
Copper sulfate –
It is an inorganic compound that combines sulfur with copper.
It can kill bacteria, algae, snails, and fungi.
It controls fungal diseases by damaging enzymes and proteins critical to fungal growth.
It has been registered for use as pesticide product in the United States since 1956.
Hydrogen peroxide –
Well known as an ingredient in disinfectant products, it’s now also approved for controlling microbial pests, on crops growing indoors and outdoors, and on certain crops after harvest.
This active ingredient prevents, and controls bacteria, and fungi by destroying essential components of the cells.
Neem oil –
A naturally occurring pesticide, found in seeds from the neem tree.
Azadirachtin is the most active component here.
It reduces insect feeding and acts as a repellent.
It also interferes with insect hormone systems, making it harder for insects to grow and lay eggs.
You might also like these articles:
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- Pre spraying stages
- How Mycorrhizae Can Help Your Plants Thrive
- How can I control pests and diseases in my garden?
- Growing Corn: Tips for Choosing the Right Variety and Achieving Healthy Growth
- How to Grow Eggplants: A Guide to Growing, Harvesting, and Enjoying this Versatile Vegetable
- Seedlings Falling Over & Dying? Damping Off Disease? Best Fungicide Prevention + Treatment for Seedlings
- Growing Potatoes Step-by-Step? Best Seed Potatoes, Grow Bags & Potato Growing Kit Guide
- Slugs & Snails Eating Your Plants? Best Slug and Snail Bait with Iron Phosphate – Organic Control (OMRI Listed)
- Bacterial Leaf Spot on Tomatoes & Peppers? How to Control It with Copper Fungicide – Organic Treatment (OMRI Listed)
- Tomato Pith Necrosis (Pseudomonas) on Tomatoes? How to Control It with Copper Fungicide – Organic Treatment
- Vegetables’ Physiological Problems? Sunscald, Cracking, Blossom End Rot? Best Calcium Spray & Prevention Kit
