Plant disease - AQA Plant diseases and pathogens - Higher
Pathogens are disease-causing viruses, bacteria, fungi or protists which attack plants as well as animals. Plants have physical and chemical defences against pathogens.
Symptoms of plant diseases and identification of pathogens - Higher
Symptoms
Plant pathogenMicroorganism that causes disease. cause diseases with a range of different symptoms. These symptoms can be used to identify the pathogen and then treat the disease, or limit its effects.
The symptoms of common plant infections are shown below.
Slide 1 of 6, Citrus mealy bug, Symptom and example of disease Stunted growth from mealybugs
End of image gallery
Identification
Farmers and gardeners often use books and the internet to identify plant diseases. They can also take a small cutting of an infected plant (or a photograph of it) to a local garden centre, which have staff that can often help identify and treat the disease. For diseases that are more difficult to identify, cuttings of the plant may be analysed by scientists in laboratories using testing kits containing monoclonal antibodies.