Pear trees in China have a very wide range of planting, and for those planting pear trees for the fruit farmers, the most headache is the pear tree of all kinds of diseases and insect pests, these diseases and insect pests from the day the pear trees are cultivated into the soil has become a "stumbling block" that hinders the normal growth and development of pear trees, and even many diseases and insect pests have not been prevented in time after the occurrence of fruit farmers has caused great economic losses. Today I want to tell you about a kind of insect pest, especially the pear garden with more young trees is more seriously damaged, and the insect pest that harms the pear tree is the "pear stem bee". Today, I will talk in detail about the harm of pear stem bees to pear trees and the law of their occurrence, of course, it is indispensable to tell you how to control the insect pest.
<h1>First, what harm will the "pear stem bee" cause to the pear tree</h1>
Pear stem bee, usually also known as pear stem bee or pear stem saw bee, familiar with its fruit farmers call it folding worm or pruning worm, as its name, pear stem bee mainly harm is the new shoots of pear trees, the harm is mostly larval form and adult form, adult insect form is the most serious harm to pear trees. This type of insect pest occurs to varying degrees in most pear tree planting areas in China.
Young shoots after being harmed by pear stem bees
<h1>Second, how the "pear stem bee" harms the pear tree</h1>
In general, when the pear stem bee endangers the new shoots of the pear tree, most of them are when the new shoots grow to seven or eight centimeters, at this time, the adult worms of the pear stem bees will use their saw-like spawners to saw the five or six leaves of the young shoots, and after the sawing, the leaves of the four or five leaves under the wound will be sawn off, leaving only the petiole and laying the eggs in the petiole. It doesn't take long for the new shoots that are killed to appear atrophied and sagging, and slowly dry out until they fall off. When the eggs in the petiole hatch, they will continue to feed on the remaining tender stem marrow, and the damaged young stem will slowly turn into a brown branch, the texture is very brittle, and it will break when it is broken.
Young shoots that are infested by pear stems and bees form dry stems
<h1>Third, what are the characteristics of different forms of "pear stem bees"</h1>
Larvae and adults of pear stem bees
Morphological characteristics of the larvae: the larval body length of the pear stem bee is similar to that of the adult, even longer than the adult, the body length is about 11 mm, the body is flat, the body color is pale yellow, and the head of the larvae is yellowish brown, the tail of the insect is slightly upturned, and there is no insect foot.
Morphological characteristics of the pupa: the morphological characteristics of the pupae are relatively single, the entire pupal is white, and when its mature larvae are feathered, the color of the pupal changes from white to black, and there is also a very obvious red ventral eye.
Morphological characteristics of eggs: The eggs are milky white oval, generally the length of the eggs is about 1 mm, slightly curved, and the whole body is translucent.
Pear stem bee larvae eat the upper annual branches
<h1>Fourth, the occurrence of "pear stem bee" insect infestation</h1>
Pear stem bees
Pear stem bees occur only one generation a year, and most of the way they overwinter is by old mature larvae overwintering in the branches of the affected. When the pear trees bloom the following year, the adult pear stem bees begin to feather, and the five days after the pear trees enter the full blooming period are the peak period for female pear stem bees to lay eggs.
Adults of pear stem bees have the characteristics of day and night, and will come out during the day and lie on the back of the leaves of the new shoots at night or early in the morning. It is worth mentioning that when the temperature is low in the rainy day or in the morning and evening, it will also stop moving and lie on the back of the leaf.
Female adults of pear stem bees will use their saw-like ovipositor to cut 5 to 6 leaves of the young shoots of pear trees when laying eggs, and then lay eggs under the saw wound, and the time of egg laying will generally last for about half a month. The egg period is about a week, and then when the larva hatches, it will feed on the nearby branches, and generally in May, the larvae will moth near the biennial branches, and by mid-June, they will all moth into the biennial branches, and by August the larvae will begin to cocoon upwards to prepare for wintering.
<h1>Fifth, how to control the pear tree "pear stem bee" insect infestation</h1>
1. Artificial prevention and control
Artificial control of pear tree "pear stem bee" insect pest is the simplest way of control, take this way of control is mainly based on the occurrence of pear stem bees to take corresponding measures, the specific way is that when the pear tree falls flowers, within 15 days after the fall of the flower, manually cut the branches that are eaten by the pear stem bees, and the branches that are cut off are destroyed in a centralized manner; in addition, when the winter comes, it should also be combined with the winter shearing work of the pear tree, and the dead branches should be cut in time when the winter shears are found, and the burned treatment should be uniformly carried out.
2. Use tools to prevent and control
Insect pests are different from other diseases of pear trees, which is also because pests are alive, therefore, the use of tools to catch and kill insects is also a very effective way, and for the control of pear stem bees can also use tools to control, for example, in the early stage of the pear stem bee, you can hang the sticky worm board on the outer branches of the pear tree canopy, the branches of the hanging sticky worm board are best off the ground, the height is about one meter and five is the most appropriate, in general, 20 to 40 pieces of sticky worm board should be hung per acre of orchard, but it should be noted that, Always pay attention to the sticky insect board hanging in the orchard, and replace it in time when the sticky worm board is full of pests.
Use of armyworm plates for control
3. Pharmaceutical prevention and control
Spraying the orchard to control pear stem bees is also a very effective way of control, and because the pear stem bees are more seriously harmful to the young shoots, so in general, the adult pear orchard does not need to spray to control, and for orchards with more young trees, if the pear stem bee insect infestation occurs more seriously, spraying needs to pay special attention to the spraying period, the best spraying effect is the occurrence period of pear stem bees, that is, the separation period of pear tree tidbits, spraying once during this period, When the pear tree enters the flowering stage, it can be sprayed once more effectively to control the pear stem bee insect infestation.
The following agents can be selected when selecting agents: chlorpyrifos emulsion or chlorpyrifos wettable powder, high-performance cypermethrin emulsion, high-performance cypermethrin emulsion or high-efficiency cyanide emulsion, cypermethrin emulsion and chloryanidium chlorpyrifos emulsion.
Spray control
Summary: "pear stem bee" insect pest harm to pear trees is relatively large, especially in the orchard with more young trees, once the outbreak of "pear stem bee" insect infestation, the harmful consequences are very serious, and as a fruit farmer planting pear trees, master the occurrence of "pear stem bee" and learn how to control it is the key factor to avoid outbreak of insect pests, this article explains in detail the "pear stem bee" and how to control, Learning to control all kinds of pests and diseases is also a must for every grower who wants to manage the orchard.
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