Plant Diseases

31. Which of the following is a viral disease affecting roses?

a) Rose rosette disease

b) Citrus canker

c) Black spot

d) Fire blight

32. Which of the following is a common method of preventing the spread of plant diseases?

a) Using chemical pesticides

b) Avoiding overcrowding of plants

c) Planting susceptible crops

d) Ignoring diseased plants

33. Which of the following is a fungal disease affecting corn?

a) Late blight

b) Fusarium wilt

c) Corn smut

d) Root rot

34. What is a common symptom of bacterial spot in plants?

a) Yellowing of leaves

b) Wilting

c) Lesions on leaves and fruits

d) Mottled leaves

35. Which of the following is a viral disease affecting cucumbers?

a) Late blight

b) Bacterial blight

c) Cucumber mosaic virus

d) Downy mildew