Fusarium wilt is most prevalent in indoor gardens and greenhouses is where it does happen outdoors. Reservoirs where nutrientsolutions are above 75° F (24° C) create a perfect condition for Fusarium to flourishto keep the reservoir cooled.
If water is an issue, then you will need to drain the reservoir and refill it up with fresh water as well as nutrients. Fusarium wilt starts as showing small spots on older lower leaves.
Interveinal chlorosisdevelops on the leaves very quickly and leaf tips may curl before wilting along with dying off. With fusarium wilt on either part of the plant will wilt and even possibly the whole cannabis plant.
The disease starts in the plant’s xylem, which is the base of the fluid transport system. The reason the cannabis plant wilts is because the fungi clog up the plants fluid flow in the tissue.
You can check your plants for this, by cutting one of the main stems in half and look for a reddish-brown color inside. Cleanliness is the best prevention, along with using fresh, sterile growing mediums.
Not re-using old growing mediums will help prevent this and avoiding too much nitrogen fertilizer. Add hydrogen peroxide to the reservoir and keep the water temperatures down.
If you want to spray your plants, you can treat seeds with a chemical fungicide to kill the infection. Chemical fungicides are not very effective on plant foliage.
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