What to do if the rose is bitten by a longicorn beetle?
An introduction to green plants and flowers for netizens who are concerned about how to deal with roses bitten by longicorn beetles, with the following details:
What to do if the rose is bitten by a longicorn beetle?
Some flower enthusiasts have found that their rose branches have been bitten by insects, with a large section of the branch bark completely eaten away. I believe many flower enthusiasts have encountered this phenomenon. previously grafted Abels have also had their branches bitten through by insects. So, what kind of insect is doing this?
1. -- Beetles that like to bite tree bark --
There are not many beetles that like to bite tree bark, the most common being longicorn beetles.
Longicorn beetles are a general term for insects in the Cerambycidae family of the Polyphaga suborder. There are about 20,000 species of longicorn beetles worldwide. They have a pair of very long antennae, which are usually longer than their body length.
Longicorn beetles are as strong as bulls and have a powerful flying ability, hence the name. When I was young and lived in the countryside, there were not many toys around, and every time adults saw them, they would catch them for us kids to play with. Back then, adults called them "golden ancient bulls," and I believe many 80s kids have played with them.
2. -- The damage caused by longicorn beetles --
As summer approaches, longicorn beetles will gradually become more numerous. Don't think that the damage caused by longicorn beetles is just biting tree bark. In fact, the real damage is caused by their larvae to trees.
In fact, longicorn beetles don't bite tree bark to eat; they do it to lay eggs. The way longicorn beetles lay eggs is related to the form of their mouthparts. If it's a front-mouthed longicorn beetle, it will lay eggs in the rough bark crevices or cracks, usually on some large trees that have been growing for many years.
And for lower-mouthed longicorn beetles, before laying eggs, they will gnaw grooves on branches or tree trunks and then lay eggs in the grooves. So, it seems that the behavior of biting tree bark is actually preparing for egg-laying.
3. -- Methods to prevent and control longicorn beetles --
Longicorn beetles don't stay on rose plants all the time, so to prevent and control the damage caused by them, it's necessary to persist in regularly applying pesticides. You can use beta-cypermethrin or thiamethoxam, both of which are effective.
Last week, I used thiamethoxam, and I found dead longicorn beetles and golden beetles for three consecutive days after applying the pesticide. However, the effect of a single application is limited, so it is recommended to apply the pesticide again after half a month for continuous prevention and better results.
Some flower enthusiasts ask if sticky insect boards can be used for longicorn beetles. Sticky insect boards seem to have no effect on them, but longicorn beetles are phototactic, so lights can be used to attract and kill them.
If you have found longicorn beetles or golden beetles in your garden, be sure to apply pesticides promptly to kill the adults and prevent the larvae from causing fatal damage to the roses after laying eggs.
The above sharing on what to do if the rose is bitten by a longicorn beetle is hoped to bring a little help to your life!