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This year you have to have strong nerves as a hobby gardener. Especially if you have fruit trees in the garden. Because the late frost in spring has left its mark on many places: flowers have been frozen or at least heavily damaged and therefore some trees now bear only a few, damaged or no fruits.
Ms. Ed. Beate Leufen-Bohlsen
My Rubinette apple is fortunately protected in the garden and, as every year, has abundant fruit - much to the delight of the birds, who chirp loudly on the branches and feed on the apples.
But the two apple trees on the lawn next to our editorial office (the variety names are not known) make a not quite as good impression. Looking closely, I found the following damages.
Impeccable at first glance, the apple scab shows up in some fruits. In the case of this common fungal disease, the fruits initially develop small, round, dark patches that can expand to harvest. In case of a strong infestation, the fruit skin ruptures scarsily. The disease, which occurs in many species, also causes a typical damage on the leaves: gray-brown spots with a velvety appearance form here.
A slight scab infestation of the fruits is tolerable. There are no major losses in taste, but the apples are barely suitable for storage
Since the spores can only grow in the spring and early summer when moisture in the leaves and fruits, you should keep the treetops through regular Auslichtungsschnitte air permeable. In addition, you should pick up fallen leaves and fallen fruit from the ground and dispose of it.
In addition, the codler has been at work, as can be seen on brown Kotkrümeln, which adhere to the well on the shell, well. When slicing the fruit, feeding ducts can be seen that reach into the core housing. In them lives the up to two inches long, pale-flesh-colored "Obstmade". The winder itself is a nondescript little butterfly. Fighting the codling moth is difficult, but to reduce the infestation starting June, the creation of corrugated cardboard belts on the trunk below the crown. Sustainable control is only possible if you monitor the flight times of butterflies with special fruit traps. Temporally tuned to treat the trees then with biological preparations containing as active ingredient so-called granulosis viruses. These infect the fruit jellies on contact and kill them. It is best to pick infected fruit right away and dispose of it in the household waste so that the moths can not spread.
Codling moth larvae ("fruit maggots") are among the most important pests on the apple
If you only notice the damage on ripe apples, you simply cut out any affected areas - the rest of the fruits can be eaten without hesitation.
What at first glance looks like a large-scale scab attack, is probably more due to the unusual weather conditions in spring. Because late frosts and temperatures just above freezing point can cause changes in the fruit skin, such as wide frost belts with cracks, which can pull around the whole fruit and sometimes even constrict it. In addition, one can recognize on some varieties of cork strips that extend from the flower to the stalk and limit the fruit growth at this point.
Typical symptoms of frost damage to the apple
Unfortunately, some fruits are already on the ground and rot in August. The ring-shaped, yellowish-brown mold pads indicate a fungus attack, the Monilia fruit rot. The spores penetrate over wounds (or the holes of the codling moth) into the apple and destroy the pulp, which then turns brown. To curb the spread, you collect the fruits regularly and disposed of them through the household or organic waste.
Fallow fruit and fruit infested with disease or pests should be removed from the garden at an early stage to reduce the spread of various diseases
Tip: When cutting your fruit trees, remove the dried fruits from the previous year (fruit mummies) and discard them in the bio bin. They can harbor Monilia pathogens, which cause fruit infections in the apple and lace drought in cherry trees. The spore bearings are arranged on the fruits in cream-colored rings. The spores are spread in the spring by the wind.