ABSTRACT
Below are described some of the most important horticultural diseases caused by fungi, bacteria and viruses.
Phyllosphere
The classifi cation of fungi referred to in Chapter 4 has practical implications in understanding fungal disease life cycles and control. Species within a fungal division often have similar methods of spread, and of survival. Their similarity of spore and hypha structure and of biochemistry also means that they are often controlled by a common fungicide active ingredient. For this reason, the appropriate fungal division is given for each disease as it appears (e.g. Zygomycota is mentioned against potato blight).