In greenhouses, this disease causes big problems during the fall, in the early winter and spring, due to the high relative humidity of air and the temperature,[3] that are propitious for the leaf mold development.

The symptoms of this disease commonly occurs on foliage, and it develops on both sides of the leaf on the adaxial and abaxial surface.

[5] The diagnostic symptom develops on lower surface as an olive green to grayish purple and velvety appearance, which are composed of spores (conidia).

Free water is required for Cladosporium fulvum to germinate, spores are unable to infect the perfectly dried leaf.

Spores are highly dependent on weather condition to germinate, thus they only geminate in water films or when the humidity level are superior than 85%, at temperature among 40° and 94 °F (4° and 34 °C).

Although it was previously considered that C. fulvum only reproduces asexually, the discovery of mating type genes indicated a capability for sexual reproduction.

It includes adequating row and plant spacing that promote better air circulation through the canopy reducing the humidity; preventing excessive nitrogen on fertilization since nitrogen out of balance enhances foliage disease development; keeping the relatively humidity below 85% (suitable on greenhouse), promote air circulation inside the greenhouse, early planting might to reduce the disease severity and seed treatment with hot water (25 minutes at 122 °F or 50 °C).

[2] This disease is not common on the fruit, but if the control is not run, the foliage can be greatly damaged and result in significant yield losses.

Once the spores of this fungi are spread by air, water, tools and insects,[10] the development of the disease is quick, moving from lower to upper leaves; the controlling must be done as soon as possible.

It includes avoiding water on the surface of leaves, handling plants in high humidity, and in the worst case, disinfecting the whole greenhouse.