In the spring, favorable conditions are formed for the mass distribution of stem pests of coniferous trees, in connection with which there is a frequent defeat of young plantings of spruces, pines and thuja. Small holes can be observed on the affected plants – passages on the trunk, resin begins to stand out from the damage, as a result of which the trunk becomes covered with resin streaks, the color of the needles changes from bright green to pale, in the summer you can observe the appearance of sawdust on the trunk and under the tree, you can also hear crackling is the result of the beetle’s work.
Stem pests are a large group of insects that feed on the tissues of the tree trunk. Under the bark and in the wood of the trunk and branches, they gnaw through passages that have a shape characteristic of each species. These are the larvae of beetles of the family of bark beetles, barbel beetles, golden beetles, as well as larvae of Hymenoptera from the family of horn-tails. Drills, grinders, etc. are of lesser importance.
First of all, weakened trees, as well as young plantings, are susceptible to damage, while the plants take root and adapt to a new place. Particular attention should be paid to young plantings in places where forests with conifers are located nearby, from which massive pest beetles can occur. For planting in such places, it is better to choose not dug, but healthy container plants with a good root system, which can be transplanted without damaging the roots and significantly weakening the plants.
The mass mating season of beetles is observed in May-June. The developmental cycle of larvae lasts 1.5-2 months. In some species, a repeated mating season is observed in July-August. At this time, it is necessary to carry out preventive treatments to protect the trees. When the first signs of infection appear, it is necessary to urgently take action, otherwise the affected plants quickly dry out and, with a massive defeat, die within one season.
Systemic preparations are used to protect plants from stem pests. For prophylactic purposes, beetles are sprayed during the mass summer (May-June, end of July-August once every two weeks) with a solution of 10 g per 10 liters of water from a sprayer along the crown of the plant and along the trunk until the entire surface is completely wetted. At the first signs of plant damage, watering is additionally carried out under the root with a solution of the drug at the rate of 30 g per 10 liters of water, a bucket of solution for 1 plant. You can also inject a high concentration drug from a syringe directly into the holes in the tree trunk. It is also necessary to provide the required care for the transplanted plants for their rapid survival and increase the natural level of pest resistance.
Coniferous plants processing rules
- To destroy insects and larvae, use modern insecticides, when treating ticks – acaricides, against fungal diseases – fungicides. All preparations can be found in our garden goods store or in other similar ones.
- When processing, always follow the accompanying drug instructions and do not experiment yourself with mixing different drugs and increasing the dosage.
- Treat conifers such as spruce, pine and thuja in the early morning or evening in dry weather. The prepared solution should be absorbed into the sprayed bush or tree, therefore, in hot or cloudy weather (rain), it is not worth processing.
- Try to carry out the treatment systematically if you notice the appearance of young and new pests (larvae), most likely the parasites have already managed to lay eggs earlier, and the fungi have spores. Alternate medications as resistance (addiction) may develop for the same drug.
- Be sure to use personal protective equipment when processing ephedra, do not process in windy weather, and isolate pets for a while.