potato disease forecasting for blight disease

Question 1

identify the pathogen of early blight, leaf lesions and lesions on tubers

Answer 1

pathogen- Alternaria solani

leaf lesions- show up on lower leaves as dark circular rings/ spots

lesions on tubers- spots develop as sunken or raised with a defined margin

Question 2

identify the pathogen of late blight, leaf lesions and lesions on tubers

Answer 2

pathogen- Phytophythora infestans

leaf lesions- dark greasy green water soaked spots that turn black with water soaked margin

lesions on tubers- brown rust leathery spots

Question 3

3 environmental factors important on potato late blight forecasting

Answer 3

max and min daily temperature
rainfall and irrigation
duration of humidity above 90%

Question 4

name 4 controlling measures for potato wilt disease

Answer 4

keep rotation weed free
crop rotation (every 4 yrs)
avoid using peppers, egg plants or tomatoes in the rotation
remove and destroy infested plant material