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Although it is small, it can do great damage: if the hazelnut drill has nestled in the garden, you should act quickly and fight it.Haselnussbohrer
If you have hazelnut bushes or trees in the garden, you may have to get to know the hazelnut drill. This pest belongs to the weevil family and is very similar to the Eichbohrer. However, it is somewhat larger. But you don't even have to see the beetle itself to recognize an infestation. If many of the hazelnuts that are under the shrub or hazelnut tree have a small hole, you can be sure that the hazelnut bur has nested somewhere nearby.
The holes arise because the females drill into the nuts and then lay their eggs in the fruit. This is what the small yellow-brown to brown beetles do with their rather long proboscis. The larva then feeds on the inside of the nut, causing it to fall off.
Damage pattern of the hazelnut bur
In May and June the beetle females drill into the immature green nuts and lay an egg in each of them. The larva eats the nut from the inside and as soon as it has fallen off, it crawls out through the hole. It then buries itself in the ground and pupates there. The pupated larva can then spend up to three years in the ground. Sometime in the spring, the adult beetles finally appear.
However, the hazelnut drills do not only grip the hazelnut tree. Before they attack the leaves of the hazelnut trees, the beetles first get to grips with the fruits and leaves of other trees, especially fruit trees. However, most gardeners only notice an infestation when the nuts already have round holes. If you crack an infected nut, you will see that the kernel has been eaten out and only the black feces of the larva are inside.
Prevent infestation with hazelnut drills
Combating the hazelnut borer is not easy, because there are no approved insecticides for the home garden. These are only available for commercial cultivation. You can only try to get a special permit from the plant protection agency. Otherwise you can prevent:
➤ Tip 1 - Place early ripening varieties in the garden:
It is easier to prevent the pest by taking appropriate measures. This starts with the planting of the hazelnut tree or shrub. It is ideal if you only place early maturing varieties in the garden, as these are far from being as susceptible as other varieties.
➤ Tip 2 - pull the hazelnut tree as a single stem:
In addition, it is best to pull the hazelnut tree as a single stem. Then you have the option of attaching a glue ring to the trunk so that the beetles cannot even get into the tree top. The females of the hazelnut drill can fly, but they are lazy and prefer to move crawling. This glue ring is promising, but it cannot always deter all animals.
➤ Tip 3 - Shake off the hazelnut drill regularly:
Another step is to shake and collect the beetles regularly. Before you start shaking the plant, spread a light cloth or foil underneath. The pests are still sluggish in the morning, so this is the ideal time of day to do this.
➤ Tip 4 - Check hazelnuts regularly:
In May and June you should check the nuts regularly for holes and remove damaged ones immediately.
Fight larvae and beetles properly
You may have heard the advice that the soil should be dug up in autumn so that the larvae that hibernate in it are destroyed. However, this usually causes great damage to the plant, since it is a shallow root. Therefore, you should definitely take other paths.
➤ Tip 1 - Apply lime nitrogen fertilizer:
To tackle the larvae of the hazelnut borer, you should apply a lime nitrogen fertilizer in spring. It also contains some hydrocyanic acid, which can cause the larvae to die.
➤ Tip 2 - use parasitic nematodes:
You can also try using parasitic nematodes. These can kill the larvae in the ground if you catch the ideal time.
➤ Tip 3 - Spray Spruzit:
To destroy the beetles climbing up the trunk, you can spray spruzite (e.g. NEUDORFF spruzite pest-free). This consists of rapeseed oil and therefore does not endanger bees.
➤ Tip 4 - Use chickens as a control:
If you have chickens in the garden, larvae and beetles are a popular and favorite food for them. If the hazelnut tree or shrub is in an area in the garden where the chickens cannot do much damage, you should let them run freely in the area of the hazelnut family for a few days.
➤ Tip 5 - Cut back the hazelnut shrub:
If you can do without the nuts for a season, you can also cut back the shrub strongly. Simply cut off the fruit in spring.