Tianniu is a very common pest in the garden, mainly to the larva moth to eat the branches of seedlings for harm, adult insects can eat the bark of the branches; the plants that have been harmed by it, the nutrient transmission tissue will be destroyed, affecting the normal growth of plants and ornamental value, and the serious will dry up and die of the whole plant.
So, what exactly is Tianniu? Why is it said that although the tianniu is not a cow, the harm is greater than that of the cow?
Today, here I will briefly share with you the harm of Tianniu to garden plants, as well as some simple prevention and control methods, I hope to help you!
<h1>1. What is Tianniu? </h1>
The picture shows the adult insect of the Celestial Bull
The celestial bull is actually a dry moth pest that is very common in the conservation process of garden plants, belonging to the Coleoptera family. At present, the main types of tianniu endangered in the garden are xingtianniu, bare-shouldered tianniu, cloud-spotted tianniu, mulberry tianniu, peach-necked tianniu, pine brown tianniu, etc., although the harm time is slightly different, but the hazard characteristics are generally the same.
In the garden, the celestial bull is mainly harmful to willow trees, mulberry trees, locust trees, poplar trees, neem trees, pine trees, and red maples and other maple trees. The reason why the tianniu is called the tianniu is mainly because it is larger and stronger than other pests, plus its adult insects are good at flying in the sky, so it has the name of the tianniu.
<h1>Second, why is it said that the celestial cow is not a cow, but the harm is greater than that of the cow? </h1>
The reason why the harm of the tianniu is greater than that of the cattle is mainly because the mouth organ of the tianniu is very sharp, and it can easily damage the branches of the seedlings, and whether it is in the larval stage or the adult stage, it will cause devastating damage to the seedlings.
The picture shows the harm of tianniu larvae to plants
In June and July of each year, the adults of the tianniu will feather, mate, nibble on the bark of the branches of the seedlings, and then lay eggs; after these eggs hatch, these newly hatched larvae will parasitize in the formation layer under the bark to make harms, and as the insects age, they will gradually moth into the xylem of the seedlings for harm.
Seedlings that have been endangered by tianniu, the trunk of the tree often has the outflow of sap, and the elimination of fresh wood chips, which are typical characteristics of the tianniu after the harm. In addition, due to the damage to the skin, xylem and other tissues of the victim trees, the normal transmission of nutrients and water during the growth of seedlings is affected, so that the seedlings will appear weak, early leafing, dry and dead; if they encounter strong winds, the trunks of these trees endangered by the Celestial Bull are likely to be blown by the wind, causing certain safety risks.
The picture shows the wood chips discharged after the larvae of the Tianniu larvae are infested
Therefore, although the celestial cow is not a cow, its harm cannot be underestimated!
<h1>Third, how to prevent and control the harm of Tianniu? </h1>
The picture shows the larvae of the celestial cow nibbling on the bark of the branches of the seedlings
In most areas, the Tennō occurs in 1 generation per year, while in a few areas it occurs in 2 generations in 3 years or 1 generation in 2 years.
The larvae of the Tianniu generally start to move around March of each year, and can cause harm from March to September; the peak of the feathering and hole method of the adult Tianniu is from the end of May to the beginning of June, and the peak of adult mating and egg laying from mid-to-late June to mid-to-late July.
It should be noted here that the harm time of each kind of Tianniu will be slightly different, and even if it is the same kind of Tianniu, the time of harm in different regions will also change, so we must learn to be flexible and not rigid.
1. How to prevent it?
Combined with winter shearing, timely pruning of dead branches, diseased branches, branches carrying insect eggs, as well as upturned and dead skins of seedlings, reduce the source of overwintering insects;
In winter, timely spraying of stone sulfur compound to clear the seedlings and nurseries;
In the middle of March every spring, granular insecticides such as diazine phosphorus, octylthion, and chlorpyrifos are buried in the roots of seedlings prone to occurrence before the insect infestation begins, making the sap of the tree itself poisonous.
2. How to prevent and control?
(1) Larval control
The picture shows the use of trunk jutting method to control Tianniu larvae
At present, there are many methods for controlling Tianniu larvae, such as poison signature method, medicinal cotton plugging method, insect hole injection method, trunk insertion method, artificial hooking method, root burial method, etc.; however, these methods are relatively troublesome to operate and slow to achieve results.
Nowadays, more and more people choose high concentrations of chlorpyrifos, and then with the strong osmotic agent orange peel essential oil, directly spray the trunk of the tree that is harmed by the tianniu larvae; however, this method is relatively expensive.
(2) Adult insect control
The picture shows the adult tianniu
The control of adult Tianniu is mainly concentrated in June and July. The main methods mainly include the following aspects:
During the spawning period of adult Tianniu, bait trees can be released in the nursery, and after Tianniu has laid its eggs, these bait trees can be intensively incinerated;
You can also take advantage of the clumsy habits of the adult tianniu to find adult insects on the trunks and main branches of the trees that the tianniu likes in the early morning when the dew is not dry, and carry out manual hunting.
Of course, chemicals can also be used for prevention. At present, one of the agents with better effects in controlling adult Tianniu is green Weer and one is a high-efficiency cypermethrin microcapsulant suspension.
<h1>What needs to be noted here is:</h1>
The picture shows the marks left on the bark of the tree when the celestial cow is ready to lay eggs
Any pest that continues to occur is because it forms a closed loop that lasts for generations. The best way to prevent it is to break one or more links of the closed loop and break the chain.
So, if your trees have just been transplanted this summer, and they happen to be the kind of trees that Tianniu likes to harm, then hurry up and prevent it!
Starting in the first summer after the seedlings are transplanted, as long as the adults of the tianniu are found, no larvae will appear next spring.
Well, about the harm of Tianniu and the prevention and control methods will be introduced to you here today, I hope to help you!
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