_______________is any abnormal condition that alters the appearance or function of a plant.

Visible effects of disease on plants are called ________

• Signs

• symptoms

• both

• none

Bacterial ooze is an example of ____________

• Signs

• symptoms

• both

• none

The parasitic organism that causes a disease is a _____________

The plant invaded by the pathogen and serving as its food source is referred to as a ________________________

Plant pathogen includes

• fungi

• bacteria

• viruses

• all the above

Which plant pathogen structure is delicate, threadlike filaments called hyphae

• fungi

• nematodes

• algae

• virus

Which pathogen can live only in living organisms

Pathogen can survive in

• Crop residue

• weeds

• seeds

• all of these

Virus can disperse only through ________________________