The damage caused by moulds depends on the type of mould and the crop. There are also the pseudo-moulds, the oomycetes. These have a slightly different cell structure but behave like moulds. Examples include phytophthora and red rot.
Whether a disease actually occurs depends on three elements: the number of spores of the mould, the sensitivity of the plant and, finally, the environment. Therefore, conditions and infection pressure may be different for each mould-crop combination. Also, moulds vary enormously
A correct diagnosis and specific advice are therefore indispensable.