How to detect the early stages of oviposition by rose stem sawflies on rose branches?
Today's focus is on introducing the methods to deal with rose stem sawflies in the aspect of green plants, and the specific details are as follows:
In the past few days, while tidying up the garden, I found that several roses had their tender tips destroyed by stem sawflies. Helplessly, I immediately sprayed a high-efficiency pyrethroid insecticide, hoping to kill the adult stem sawflies, although I knew this method has limited effectiveness. Actually, at this time of the year, rose growers all hate stem sawflies to the bone but are helpless. What should we do to deal with stem sawflies?
Methods to deal with rose stem sawflies
The damage caused by stem sawflies to roses is not fatal, but the offense to rose growers is strong. We work hard to cultivate rose flowers, and just when the flower buds appear on the strong branches, they suddenly wilt overnight, and there's nothing we can do about it. Isn't it frustrating?
After discovering that the most neatly grown candy cane plant had seven or eight branches affected, I have been thinking of ways to deal with these stem sawflies, as the effect of spraying insecticides is very weak.
The currently feasible method is to hang sticky insect boards. However, stem sawflies are not sensitive to sticky insect boards. It can be said that the stem sawflies that get stuck are either not smart or have poor eyesight. Therefore, for hanging sticky insect boards, I think it's okay if you have a few roses. If you have many roses, hanging sticky insect boards is not effective and affects the appearance.
For the prevention of stem sawflies, the main focus is to prevent the adult sawflies from laying eggs in the branches, so I thought about whether there is any way to drive away stem sawflies.
Then I found a laser windmill and laser ribbons designed to deter birds, which work by using the reflective windmill or ribbons to scare birds away. I thought this should also have a deterrent effect on adult stem sawflies. As long as the stem sawflies don't dare to fly over to lay eggs on the branches, our goal is achieved. So I decisively bought the laser ribbons.
However, the day after I placed the order, my area was completely locked down, and the delivery couldn't get in or out. Oh well, interested friends can test the effect of this laser ribbon.
If one plan fails, try another. Since it's the larvae that cause damage, is it possible to kill the eggs or newly hatched larvae before they hatch?
How to detect the early stages of oviposition by stem sawflies on rose branches?
However, to kill the eggs, it's necessary to discover the branches that have been oviposited early. Usually, we only notice the problem when the tender branches start to wilt, but by then, it's often too late. Although some gardening friends have invented the "acupuncture" method, the actual operation is too difficult, and it's hard to find the eggs accurately, resulting in the failure to save the rose branches.
If it's really possible to use insecticides before or immediately after the eggs hatch, the operability is much stronger.
How to detect the early stages of oviposition by stem sawflies on rose branches?
If we observe carefully, we can see the differences in rose branches where stem sawflies have laid eggs. It is recommended to observe the strong new branches at night with a flashlight, as stem sawflies prefer to lay eggs on strong branches.
Rose branches that have been oviposited will not wilt directly in the early stages, but careful observation will reveal that the top of the rose branches will have a slight tilt instead of standing upright. This is because after the branches are oviposited, the transport of nutrients and water is affected, causing the top buds to show a slight water deficiency tilt.
Why observe at night? Because during the day, strong sunlight can cause many normal rose branches to also show slight water deficiency and wilt. We can't check every single branch, but at night, branches that have not been damaged should be standing straight, making the first round of inspection easier.
After identifying the target branches, use a strong flashlight to shine on the branches and look for signs of stem sawfly oviposition. When you see this V-shaped shadow, it indicates the position where stem sawflies have laid eggs. Note that sometimes there may be two or three puncture marks on a single branch, and although they may not all have eggs, none should be overlooked.
After finding the punctured position, use insecticides such as acetamiprid or phoxim, diluted into a solution 2-3 times the concentration of the spray, and then use a pipette or syringe to吸取 the solution and drip it onto the oviposition site. You can also use a cotton swab to apply the solution to the oviposition site, applying as much as possible to let the branch absorb the solution and kill the eggs and newly hatched larvae.
Do you have any better methods to deal with stem sawflies? Welcome to leave a comment.
The introduction of methods to deal with rose stem sawflies and how to detect the early stages of oviposition by stem sawflies on rose branches, as detailed by Green Enthusiast Network [www.lvzhimi.com], have you understood them?