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  2. Gymnosporangium juniperi-virginianae - Wikipedia

    en.wikipedia.org/wiki/Gymnosporangium_juniperi...

    On the apple tree, the infections occur on leaves, fruit and young twigs. [4] The brightly colored spots produced on the leaves make it easy to identify. Small, yellow-orange spots appear on the upper surfaces of the leaves, anytime from April to June. [5] These spots gradually enlarge and turn orange or red and may show concentric rings of color.

  3. Autumn leaf color - Wikipedia

    en.wikipedia.org/wiki/Autumn_leaf_color

    A greater proportion of aphids that avoid apple trees with red leaves manage to grow and develop compared to those that do not. [16] A trade-off, moreover, exists between fruit size, leaf color, and aphids resistance as varieties with red leaves have smaller fruits, suggesting a cost to the production of red leaves linked to a greater need for ...

  4. Alternaria mali - Wikipedia

    en.wikipedia.org/wiki/Alternaria_mali

    Apple trees can recognize invading pathogens and mount a defense. [4] Often, the plant may be able to resist the pathogen, even though it has no genetic resistance to same. Apple trees seem to have a weak defense to A. mali, base on the fact that no survivors if leaves has been infected. [clarification needed]

  5. How to Prune an Apple Tree So It Produces Fruit for ... - AOL

    www.aol.com/prune-apple-tree-produces-fruit...

    Apple trees are susceptible to many diseases, and because pruning involves leaving open wounds from branch cuts, it's best to do so when the trees are dormant, says Ferguson. Waiting until winter ...

  6. List of apple diseases - Wikipedia

    en.wikipedia.org/wiki/List_of_apple_diseases

    Apple scar skin = apple dapple, apple sabi-ka, apple bumpy fruit ... Dead spur GTP, unidentified False sting GTP, virus suspected Green crinkle

  7. 25 Types of Apples for Baking, Snacking or Turning into Cider

    www.aol.com/25-types-apples-baking-snacking...

    Patrick Walsh/EyeEm/Getty Images. Taste: acidic and refreshing Best for: eating raw, baking Another Australian fruit, this apple type was cross-bred in 1973 by John Cripps. These ruby cuties are ...

  8. Fire blight - Wikipedia

    en.wikipedia.org/wiki/Fire_blight

    The decline of apple and pear trees from their landscape can be expensive to replace and could have a negative effect on tourism. In the long-run, fire blight is a very important factor of economy and society. [citation needed] A relatively small number of apple cultivars are responsible for an enormous proportion of yearly apple production.

  9. Specific replant disease - Wikipedia

    en.wikipedia.org/wiki/Specific_replant_disease

    The extra time to cropping may be offset if new trees are planted a few years in advance of old trees finally falling over, furthermore, if the old orchard was grubbed— i.e. trees were healthy when removed, it is unlikely that replant disease would be a problem as pathogen levels may never have been high.

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