disease and characteristics

Question 1

what are three factors involved in disease development?

Answer 1

susceptible host
virulent pathogen
favorable enviroment

Question 2

name the infectious and non infectious disease causing agent?

Answer 2

infectious- bacteria, viruses, nematodes

non infectious- nutrient deficiency, sun burn, toxic chemicals

Question 3

list 2 diseases and an associated symptom with each?

Answer 3

black leg- causes the bottom of the stem to turn black

Ergot- turns the seeds on the head black