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They are small, brown and can do great damage: raspberry beetles. With our three tips you can easily fight this beetle.Always fight raspberry beetles immediately
Most hobby gardeners who have raspberries in their garden will get to know the raspberry beetle at least once. This belongs to the flower eater family and is one of the most important pests of raspberry plants. However, it not only attacks raspberries, but also blackberries, cherries, plums, pears and apples.
The hairy, grayish pest is only five millimeters in size and reaches the fruit plants through weeds, especially dandelions. The larvae then develop directly in the fruit. You become mad, so to speak. Too bad, because what is more delicious than raspberries from your own garden? So don't let the berries make you mad and fight this pest.
The development of the raspberry beetle
The beetle hibernates in burrows and then comes back to the surface in May. If the weather is mild enough, the flying beetles then land on the flowers of the fruit plants. They then nibble on them and feed on them. After the females have been fertilized, they lay a single egg in each flower. And such a raspberry beetle female can easily produce a few hundred eggs, so that usually many flowers are affected.
After about 10 days, when the berries slowly turn red, the larvae hatch from the eggs. They now feed on the particles within the fruit. After eight weeks at the latest, the larva is fully grown, falls to the ground and buries itself. Then the larva pupates in a cave at a depth of around 30 centimeters, which lasts until autumn. Then the beetle hatches and will appear above earth in the coming spring.
So you see that this is a cycle that constantly provides for offspring if you do not fight the raspberry beetle. The following describes exactly what the phases of the damage caused by the raspberry beetle look like.
Phases of damage from the raspberry beetle
First, the adult beetles tamper with the buds and flowers of the raspberry. As a result, the berries later remain quite small or are deformed. The pests bite off entire stems and eat up entire flowers so that only the sepals remain. This is followed by the second phase, when the larvae hatched from the eggs eat the fruit from the inside. As a result, some of the fruits turn brown. Only the undamaged crops continue to ripen and take on the red color.
The damage caused by the beetles can already be clearly recognized during the flowering period. But at the latest when you see the deformed and unappetizing raspberries, it is clear that the raspberry beetle was at work here. Therefore, you should check your raspberries regularly for an infestation and do something immediately if you have discovered the raspberry beetle.
Tips for fighting the raspberry beetle
As soon as you have noticed the infestation, you should do something about it, otherwise you will have to accept a major crop failure. You can do it like this:
➤ Tip 1 - stretch the film:
Prevention is still best, so it's best to put a black sheet (or garden mat) over the floor. If the larvae fall down now, they have no way of burying and pupating in the ground. This reliably prevents a new generation. The beetles, on the other hand, which are already developing in the ground, then have no opportunity to see daylight in spring.
➤ Tip 2 - Shake off the beetle:
If you find beetles on your raspberry plants, you can also try shaking them off. Sometimes this is also possible with the larvae in the fruit.
➤ Tip 3 - inject plant poison:
If you use plant poison, you have to consider that this harms people and animals and that the fruits are no longer edible. If such an application is unavoidable, you should inject some plant poison once before the flowering period and again afterwards.
It is important to note that you should never use such products if bees are currently on or on the plants.