Black weevils can become a persistent pest infestation on hydrangeas. You can find out how you can fight the little black beetles early in this article.
How can I successfully fight beetles on hydrangeas?
If you discover traces of feeding on the leaf edges of your hydrangeas, then they are probably infested with black weevils. The small black beetles eat the leaves while their larvae feast on the roots. Using natural methods such as wood shavings, nematodes, neem oil or simply collecting them, you should combat the infestation early before the hydrangea dies.
Which beetles can colonize hydrangeas?
The beetles on hydrangeas are usually so-calledFellow weevils The brown beetles, which are approximately one centimeter in size, love thick-fleshed leaves like those of the hydrangea. However, the beetle is not picky and also eats numerous other ornamental and useful plants.
Are black weevils harmful to hydrangeas?
Black weevils eat the leaves of hydrangeas. The leaves that have been eaten around the edge no longer look particularly nice, but in most cases they don't really harm the hydrangea.
The situation is different with thelarvaeof the beetle. These live in the soil around the hydrangeas and feed on their fine hair roots. The larvae can cause considerable damage to hydrangeas, as damaged roots make it difficult for them to absorb water and nutrients. The result can be deficiency symptoms and dryness or even the death of the plant.
How can you get rid of the black weevils from hydrangeas?
A common but quite tedious method of combating the small black pests isCollectingIn the evening you have the best chance of catching the nocturnal beetles.
One Another option iswood woolIf this is distributed under the pot and around the hydrangea, the black weevils like to hide in it. If you are quick, you can collect the shy beetles there during the day relatively easily.
To combat the beetle larvae, we recommend usingNematodesThe nematodes grow in the pot or distributed in the bed around the hydrangea with the irrigation water, whereupon they kill the larvae of the black weevil.
Neem oil can also be used against the beetles. The oil is poisonous to the black weevils. If you spray it on the plant, it can absorb the oil and therefore becomes unattractive to pests. Since neem oil also kills nematodes, you should not use these two methods at the same time.
Tip
Leaves with holes indicate other pests
Full-mouthed weevils eat bays in the edges of leaves. If, on the other hand, you see traces of feeding in the form of holes on your hydrangeas, this is more likely to be an infestation with caterpillars or snails.
