Do I have Primary Scab infection? ……and what does this mean for my Summer-Autumn spray program?
Black spot otherwise known as apple and pear scab (caused by the fungal pathogens Venturia inequalis and V.pirina), survives through Winter as spore bodies mostly on fallen leaves under your trees. In pears, the disease might also overwinter on infected shoots. In Spring during rainfall events, these spore bodies release …
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