July 2010 apple tree scab and fireblight survey

In early July 2010 I noticed some fireblight and spent an afternoon surveying the orchard for general condition of the trees and paid particular attention to the level of scab and fireblight present. Several of the trees had been fairly heavily pruned the previous winter, and a warm and damp spring combined with lots of vigorous new growth for favorable conditions for fireblight. The trees had been regularly sprayed with Captan to keep scab under control, and insect pressure was heavy, primarily from Japanese Beetles. After the survey I pruned out all the fireblight affected branches and moved them to the burn pile.

• Foxwhelp: Light fireblight, strong roots, no scab, no apples.
• Porter’s Perfection: Moderate fireblight, no scab, strong roots, the most apples of any tree.
• Betsy Deaton: Can’t tell much as the tree had been run over with a lawnmower a few weeks earlier. A repair graft was attempted but was ultimately unsuccessful.
• Red Delicious: The biggest tree; no fireblight, strong roots, no scab, but also yet again no fruit.
• Winter Banana: Light firebight, heavy scab, weak roots but clearly stronger now relative to last season. Lots of apples.
• Vandevere: Heavy fireblight, light scab, odd that it has lots of new growth coming out at knee high to me. A moderate quantity of apples. Strong roots.
• Old Fashioned Limbertwig: No fireblight, no scab, good growth but still caged against deer.
• Claygate Pearmain: Severe fireblight, light scab, good roots, very few apples.
• Golden Russet: Heavy fireblight, moderate scab, very weak roots, whole tree moves with wind despite being staked. A few apples but the tree is not thriving, probably due to the roots.
• Pitmaston Pineapple: No fireblight, light scab, good roots, a few apples.
• Pomme Gris (#2 – by driveway): No fireblight, no scab, good roots, no apples.
• Duchess of Oldenburg: No fireblight, solid roots, no scab, all of 3 apples.
• Golden Delicious: light fireblight, moderate scab, solid roots, many apples.
• Cox Orange: No fireblight, heavy scab, no apples, good roots.
• Cannon Pearmain: No fireblight, no scab, weak roots, no apples.
• Bramley’s Seedling: Heavy fireblight, light scab, vigorous growth, but not looking well due to slanted growth habit and prior struggle with deer. No apples.
• Gala: No fireblight, no scab, no scab, good growth, still caged against deer.
• Arkansas Sweet: No fireblight, light scab, good growth, still caged against deer.
• St. Edmunds Pippin: Light fireblight, little to no scab, roots seem to be weakening as the tree leans a bit, some apples, lots of insect activity.
• Pomme Gris (#1 – by fence): minor fireblight, light scab, solid roots, a few apples.

Put another way, this gives:

• No to light scab:
o Foxwhelp, Porter’s Perfection, Red Delicious, Vandevere, Old Fashioned Limbertwig, Claygate Pearmain, Pitmaston Pineapple, Pomme Gris, Duchess of Oldenburg, Cannon Pearmain, Bramley’s Seedling, Gala, Arkansas Sweet, St. Edmunds.

• Moderate scab:
o Golden Russett, Golden Delicious.

• Heavy scab:
o Winter Bananna, Cox Orange

• No to light fireblight:
o Foxwhelp, Red Delicious, Winter Banana, Old Fashioned Limbertwig, Pitmaston Pineapple, Pomme Gris, Duchess of Oldenburg, Golden Delicious, Cox Orange, Cannon Pearmain, Gala, Arkansas Sweet, St. Edmunds.

• Moderate to Heavy fireblight:
o Porter’s Perfection, Vandevere, Golden Russett, Bramley’s Seedling

• Severe fireblight:
o Claygate Pearmain,

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