Different diseases damage weak plants due to transplanting or environment conditions. The most common diseases are: powdery mildew, gray rot, anthracnose, black stem, downy mildew. Also root rot: tomato fusarial wilt, tomato fruit stem rot, pythiosis.
Viral diseases are the most dangerous as they are hardly treated. Only vaccine or preventive control of viruses can be effective. Viruses are: cucumber green mosaic, tomato spotted wilt, rose mosaic etc.
Under certain conditions or infection presence bacteria can damage plants causing bacteriosis, i.e. root and stem bacterial canker on rose, bacterial black spot on tomato, angular chlorosis on cucumber. For control agro technical measures and chemicals should be applied.