Gardening

Apple scab: preventing disease


Often called apple scab, this fungus is responsible for significant damage on this fruit tree but also on plum and pear trees.

By forming brown spots on the fruits as well as on the foliage, scab can cause a marked slowdown in their development.

You will also see fruit malformation and often rotting.

Follow these few tips and your crop will be effectively protected and preserved from scab.

Conditions for the appearance of scab

Like all fungal diseases,humidity is the most important factor of occurrence. Combined with some heat, the risk is even greater for scab to appear on your fruit trees.

So it is often at the late spring that this fungus appears, which will develop throughout the fruit growth phase.

But we also find scab in autumn when humidity is strong, especially with the length of the nights.

  • Injured trees are also much more susceptible to fungal attack.

Effective treatments for scab

We treat scab preventively:

  • In autumn, it is essential to collect and burn all the leaves.
    Also mow after the leaves have fallen to speed up their decomposition.
    Collect the fallen fruit as you go.
  • Bring compost at the foot of the trees in the fall
  • Spray a fungicide based on Bordeaux mixture at theautumn then to early spring.
    In the fall, once after the leaves have fallen
    In spring, the treatment is repeated 2 to 3 times depending on the precipitation.
    It is indeed necessary to treat again after a rainy period.

There is no truly curative treatment.

  • It is then necessary to remove the infested leaves and burn them while renewing the fungicide treatment based on Bordeaux mixture.

Be careful because the fungus overwinters on the leaves that fall from trees when infected.

In spring, the ascospores that make up this fungus are ejected into the air on humid days and reach trees by the wind.

It is therefore imperative in the fall to collect and burn all the leaves of your apple, pear or plum trees.

Scab and Edibility:

Although scab on apple, pear or other fruit trees makes the fruit unappealing, this does not detract from their edibility.

It is enough to get rid of the parts affected by the disease, all the rest of the apple or pear remains edible.

Read also, other common diseases

Video: How to prevent Apple Scab (October 2020).