Pine tree is a very common tree species in landscaping, it is tall, beautiful tree shape, evergreen, in the landscaping landscape is widely used. And there are many varieties of pine trees, almost eighty kinds, but the most commonly used in landscaping is cedar, oil pine, whitebark pine, masson pine, black pine and so on.
The picture shows the pine needles of a pine tree
Pine trees have a strong vitality, and daily management is relatively extensive. However, the control of pests and diseases is particularly important, and a little carelessness may cause the drying up of branches and even the death of the whole plant.
Pine borer and pine aphid are two kinds of pests that are very common in the conservation and management of pine trees, and are distributed in Henan, Shaanxi, Shanxi, Liaoning, Beijing and South China in Shandong, China. Their hazards can last from April in the spring to about late October, and from September to October, both types of pests reach the peak of their harm at the same time, which can be said to be very unfavorable to the growth of pine trees.
Today, here I will briefly summarize the harm law of pine borer and pine aphid, as well as the corresponding prevention and control methods, I hope to help you!
<h1>First, the hazard characteristics and laws of pine borer and pine aphid</h1>
1. The tree species that are mainly harmful to the two
The main harm species of pine borer are oil pine, black pine, Huashan pine, sassafras pine, etc.;
Pine aphid mainly harms tree species: whitebark pine, oil pine, red pine, sassafras pine, masson pine, etc.;
2. The main hazards of the two and the characteristics of the hazards
Pine borer mainly endangers the branches of pine trees by means of moths, and pine trees that are harmed by it often have curved tops, deformities, or dry tops and side branches;
The picture shows the drying of the top tips caused by the pine borer
The pine aphid mainly endangers the branches of the pine tree by sucking the sap, and the pine trees that are harmed by it often have the phenomenon of red and dry pine needles, and the greasy honeydew is often dripped under the tree. In the later stages of harm, pine needles often dry out and fall.
The picture shows the yellowing and drying of pine needles caused by pine aphids
3. The time law of the two hazards
Pine borers overwinter in the pine shoots or pine cones in the form of larvae, and begin to be active in late March and early April of the following year. In the northern region, pine borers can occur in two generations a year, with the first generation of larvae appearing in late June and early July, and the second generation of larvae emerging in late August and early September. The peak period of harm is mainly july to August, and september to October, and the larvae stop the harm in November and begin to prepare for wintering.
Pictured is the larvae of the pine borer
Pine aphids overwinter on pine needles in the form of eggs and begin to be endangered in March of the second year. In the northern region, pine aphids can occur for more than a dozen generations a year, and the damage lasts from March to November. Among them, April to June and September to October are the most serious hazards, which are the two peak periods of harm throughout the year.
The picture shows the pine aphid on the young branches of a pine tree
<h1>Second, the main reason why the two are not easy to prevent</h1>
The main reasons why pine borers are not easy to control are:
The main reason why pine borer is not easy to prevent is that the harm is relatively hidden, basically most of the time is active inside the branches, and it is difficult for general agents to penetrate into the inside of the branches to kill pests;
In addition, due to the hidden nature of the damage of pine borer, it is difficult to find in the early stage of harm. By the time it is discovered, it is often late in the stage of harm, and the pine shoots of the pine trees have been severely dried up, and the best control period has been missed.
The picture shows the pine borer found in the pine slightly
The main reasons why pine aphids are not easy to prevent are:
The reproduction rate of pine aphid is too fast, not only can it mate and reproduce, but also can reproduce parthenogenesis, the temperature is suitable for 3 to 4 days to breed a generation, the northern region reproduces more than a dozen generations a year, and the generations overlap;
In addition, the body of pine trees is generally relatively tall, and it is generally difficult to spray on the branches and young branches of pine trees when spraying;
At the same time, because pine aphids are distributed in the connection between pine needles and branches on the branches, due to the shielding of pine needles, it is difficult to hit the pine aphid body when spraying.
The picture shows the pine aphid found at the bottom of the pine needle
<h1>Third, how to prevent and control the harm of pine borer and pine aphid to pine trees? </h1>
1. How to prevent the harm of pine borer and pine aphid?
(1) Avoid large-scale pure forest planting
When planting pine trees, we must pay attention to mixing with other broad-leaved tree species, do not plant pure forests in large areas, and avoid large-scale outbreaks and spreads of insect pests;
For pine nursery and other places, it is necessary to pay attention to the ventilation and light transmission in the woodland, strengthen daily management, ensure the healthy growth of trees, and enhance their disease resistance and insect resistance.
The picture shows the whitebark pine planting base
(2) Pay attention to clearing the garden and eliminate the source of overwintering insects.
Most pests overwinter in the form of eggs or larvae on the branches and leaves of plants. Therefore, in the autumn and early spring when the liquid fluidity of pine trees is weak, it is necessary to prune the dead branches and dead leaves on the pine trees in time, and take them out of the park for destruction to reduce the source of overwintering insects.
(3) Use of agents for early prevention
Root burial:
When the trees are just beginning to grow in spring in March, use granular insecticides such as thiazide, or diazine phosphorus, octylthion, and chlorpyrifos, and dig a circular trench at the root of the pine tree for burial; after burial, water the agent so that the agent is fully dissolved for absorption by the tree.
In this way, although the tree absorbs the agent relatively slowly, the effect is relatively long-lasting, which can prevent the occurrence of insect pests for a long time.
Foliar spraying:
At the end of March and the beginning of April, when the eggs and larvae of the overwintering insects begin to move, regardless of whether the insect infestation is found in the treetops, a preventive treatment can be carried out. When spraying, you can choose thiamethoxine, or acetamiprid, etc., and silicones can be added when dispensing drugs to increase the permeability and adhesion of the agent.
2. How to prevent and control pine trees that have already occurred in pine borer and pine aphid?
For pine trees where pine borer has already occurred:
The picture shows the pine slightly borer inside the pine slightly
The dried pine can be trimmed slightly and brought out of the park for disposal. Then select insecticides such as thiazide, ethyl spironium, flufenacilamine nitrile, etc., with organic silicone, or orange peel essential oil and other infiltration agents, spray the whole pine tree with water.
In addition, due to the phototropism of the adults of the pine borer, in late May and late August, during the two periods of feathering of the adult pine borer, black lights can be set up at night to trap the adults of the pine borer.
For pine trees where pine aphids have already occurred:
The picture shows the pine tree where the pine aphid occurs
The control of aphids is mainly to grasp its reproductive law, requires a large number of medications, and is a relatively long-term process.
The control of the first generation of pine aphid hatched from the early spring wintering insect eggs is the most critical, and the insect state is relatively consistent, and there will be no generational overlap, at this time, if the control is appropriate, it will greatly reduce the overall occurrence of pine aphid.
When medicating control, acetone can be selected. Toxic emulsion, or thiamethoxam, acetamidium, imidacloprid, etc.; and because pine trees are coniferous seedlings, the surface area of the leaves is relatively small, which is not conducive to the adhesion of the drug, so in order to strengthen the adhesion of the drug, silicones and other auxiliaries must be added when dispensing.
In addition, because the reproduction rate of Pine Aphid is relatively fast, it is generally necessary to take 2 to 3 consecutive doses when controlling it, and the interval between each time is about 5 days.
<h1>Finally note that:</h1>
The method of root burial application is not only suitable for the prevention period of insect pests, but also when the insect pest is serious, the combination of root burial application agent and foliar spray agent will have a better effect.
Well, the prevention and control of pine borer and pine aphid will be shared here today. Now, it is their peak of harm, if you also have these two pests there, hurry up and control them.
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