Spot On Apples. Black spot or black scab (venturia inaequalis) is a fungal disease of apples, and spreads quickly in warm wet weather.it usually first appears in spring on young leaves, as small spots about 3 millimetres across. Please include at least one social/website link containing a recent photo of the actor.
If you store apples at cold temperatures for more than two months, they can begin to grow brown spots, and this type of discoloration is called storage scald, according to the clemson university extension. Although apples affected with this disorder are edible, the unattractive external appearance often arouses consumer concern and reduces salability of fruit. One plant prone to black spot disease is the apple tree, though black spot in apple trees is widely known as apple scab.
The fungal disease black spot (venturia inaequalis) costs around $1200 per hectare each season to control.the apple futures programme has integrated several areas of research to ensure growers can meet the minimal residue fruit standards and still control black spot.
This is not a disease, but a disorder called bitter pit (see photo here) which, like blossom end rot in cucurbits (pumpkins, zucchini etc), is caused by a calcium deficiency:. This article is a list of diseases of apples (malus domestica). Once apples have been picked, they must be stored properly to keep them crisp and free of blemishes. Blister spot is a bacterial disease of apple fruit caused by pseudomonas syringae pv.