Apple scab is the most serious apple disease, resulting in corky brown lesions on fruits and leaves.
12.
Potassium bicarbonate is an effective fungicide against powdery mildew and apple scab, allowed for use in organic farming.
13.
Except, of course, when the two main enemies of pyracantha, fire blight and apple scab, blacken the berries and leaves.
14.
Similar to the apple scab model it numerically grades risk and degree of infection and can serve as a warning system.
15.
In the orchard at harvest time it was obvious that apple scab, the bane of organic gardeners, was not a problem.
16.
Potassium bicarbonate is an effective fungicide against apple scab, as well as powdery mildew, and is allowed for use in organic farming.
17.
An apple scab prognostic model called RIMpro was developed by Marc Trapman, which numerically grades infection risk and can serve as a warning system.
18.
There are fire blight, cedar-apple rust, apple scab, powdery mildew and Japanese beetles, all of which are common and provide their own distinctive damage, ranging from leaf disfigurement to defoliation.
19.
Hedrick praised this apple as attractive and keeping well in cold storage, but added that it was imperfect in that the trees lack vigor and are vulnerable to apple scab.
20.
The initiators of the PRI disease resistant apple breeding program have discovered that " Malus floribunda " has resistance to the apple scab and founded the program to introduce this " VF gene " into cultivated apples.
