Leaves affected with leaf mold is mostly green in greenhouse or in other protected system tomato production. The disease usually starts on older tissues, and symptoms appear on younger leaves later.
Leaf mold symptoms starts as a light green to yellow spots on upper side of the leaves which can be noticed also on the underside of the leaves.
On the underside of the leaves velvety and tan appearance of the infected sections can be noticed as the disease advances, which may be absent early on.
The spots on the underside of the leaves can change to dark olive green color. The leaves can curl and wilt and the disease can cause premature drop of leaves.
The conidia (spores) of the fungus are carried around through air, water splash, and tools. The fungus can survive on contaminated seeds, plant debris or in soil.