Black Fungus (as pictured) can be devastating to almost all vegetable plants and tomatoes are definitely not excluded. The main causes of Black Fungus are incorrect watering (top watering, watering at night, etc.) and insufficient air circulation (plants too close together, branches on the ground, mulch too 
close, etc.). Black Fungus thrives in damp and cold conditions. If you see brown or black spots on leaf branches, you must take action NOW. This will not go away on its own. Some master gardeners say at the first sign of Black Fungus you should dig u p the plant and all of its soil base then throw it in the trash. Black Fungus is very contagious and imperative to be prevented. If you have slight signs of Black Fungus, you must visit your garden twice a day, determining the severity. Upon the first sighting of black mold: pinch off affected leaves or branches. If you have not already pruned your tomato plants you will find that pruning will get rid of most of the affected branches for the B lack Fungus usually progresses from the soil.
close, etc.). Black Fungus thrives in damp and cold conditions. If you see brown or black spots on leaf branches, you must take action NOW. This will not go away on its own. Some master gardeners say at the first sign of Black Fungus you should dig u p the plant and all of its soil base then throw it in the trash. Black Fungus is very contagious and imperative to be prevented. If you have slight signs of Black Fungus, you must visit your garden twice a day, determining the severity. Upon the first sighting of black mold: pinch off affected leaves or branches. If you have not already pruned your tomato plants you will find that pruning will get rid of most of the affected branches for the B lack Fungus usually progresses from the soil.
Day by Day Black Fungus Prescription
- Day One (Initial Sighting of Black Fungus): Prune Tomato Plants (see our previous notes) w hile making sure the mulch is 3 to 4 inches away from the stem at the soil;
- Day One (P M): Pinch off all affected leaves (NOTE: if you are pulling off more than one handful of leaves off one plant, then dig up the plant being careful to remove all of its soil and throw both into the trash. Do not compost!)
- Day Two (AM) Pinch off all affected leaves and purchase an Organic Fungicide (see above Note) ;
- Day Two (PM) Apply fungicide to test plants (see above Note);
- Day Three (AM) Observe affects of Fungicide on test plants (see above Note);
- Day Three (PM) Observe affects of Fungicide on test plants. If test plants are improved or unaffected by the fungicide, then apply fungicide to ALL tomato plants carefully following the directions for the fungicide (see above Note).
- Day Four (AM) After applying fungicide continue to monitor this potential disappointing devastation fungus invasion. See above NOTE.
Prevention Notes:
- Water Consistently
- Make Sure Calcium is available in the soil. (Lime and Gypsum are calcium sources. Lime raises pH. Gypsum lowers pH.)
- Prune Tomato Plants
- Plant Tomato Plants in Pots if Garden Soil is Infected (Take special note to size, color and type of pot).
- Keep pets out of planted area
- Insure Air Circulation (If in a green house then run a fan at least twice a day)
In order to eliminate bathing room pattern, you will need a remedy that can eliminate the resource of the dark pattern. When washing fungus, you have to notice the edge walls and also look for any resources of wetness.
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