Diseases and pests on the walnut tree: 19 helpful measures

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Diseases and pests on the walnut tree: 19 helpful measures: measures

Often the fight is only conditionally possible.

pest infestation

Mostly lice fall on the tree, be it lice, aphids or others. In addition, various gall mites occur. The leaves are eaten by butterfly caterpillars.
Help with suction damage
Sucking insects usually sit on the underside of leaves. They only need to be fought in case of very strong infestation. When aphids kick in, the young leaves curl up.
  • (1) Remove infected shoots!
  • (2) Often helps to rinse the lice. That definitely curbs them.
  • (3) Effective is the biological control. Suitable agents based on rapeseed oil, potash soap or pyretrum can be found in specialist shops.
  • (4) In case of heavy infestation one often has to resort to chemical means. But these are to be used wisely!
  • (5) Ideal is the fight against lice by natural enemies, such as ladybirds, Flor- and hoverflies, predatory gall bladder and parasitic wasps. You have to create a pleasant environment for these insects to settle.
Help with leaf feeding
Butterfly caterpillars feed on fresh leaves. In case of heavy infestation large parts of the tree can be exfoliated.
  • (6) Again, the biological control helps, but only in case of heavy infestation apply.
  • (7) For smaller trees you can also pick up the caterpillars.
Help with feeding damage by caterpillars of blue shoot and caterpillars of the willow drill
The caterpillars of the blue screen eat gears in branches and young trunks. The caterpillars are about 6 cm long, yellowish white and have dark point warts.
  • (8) Affected shoots must be removed!
  • (9) If you find the caterpillars in the trunk, it is safer, you clear the construction or the trees, before the pests spread even further!
The caterpillars of the willow drill also eat passages through branches and trunks. It comes to the death of branches and trunk, especially in the lower trunk area, up to 1 meter in height. The caterpillars are up to 10 cm tall, are dark-red and have a black head. Here only helps to remove the infested trees and dispose of before the pests spread.
Help with infestation of walnut fruit fly
You can see the infestation of small black dots on the green nutshell. The maggots feed on the pericarp. This will be soft, moist and black.
  • (10) As a precaution, yellow sheets can be hung in the tree.
  • (11) Infested fruit must be collected and destroyed!
  • (12) The laying out of fly nets can prevent the migration of the maggots.


Help with virus attack
Yellow line patterns and stains on leaves and fruits indicate a viral infection by the cherry sting virus. This disease can not be controlled. If in doubt, if you do not know exactly which disease it is, you should consult a specialist!
Help with real mildew
Whitish, flour-like spots or coatings, usually only on the underside of the leaf indicate powdery mildew.
  • (13) Preventively, you should apply pesticides, even before flowering! Suitable are net sulfur, but also readily biodegradable organic fungicides.
  • (14) Plant protection products should be used regularly, every year.
  • (15) Affected leaves and shoots should be cut away to contain the source of infection!
Help with fungal infections
A fungal disease can be recognized by brown to gray-brown spots. The mushroom fruit bodies are found on the undersides of the leaves. There are several fungal diseases. They often occur in rainy summers.
  • (16) Affected shoots should be removed. They do not belong to the compost, but must be disposed of or burned!
  • (17) Plant protection products are unfortunately not available.
Help with bacterial infections
A bacterial infection can be recognized by cancerous growths on the shoots of mostly young trees. These turn into warty, rough growths.
  • (18) Important is a careful wound care!
  • (19) Cut the tree only in the late summer, otherwise there will be excessive bleeding from the cut wound. There can also be diseases.

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