Ash trees are beautiful and elegant, the trunk is straight, widely used in landscaping, in recent years, ash trees are often harmed by dried borer pests, of which, the scope of harm of wood beetle moths is constantly expanding, and the degree of harm is deepening!
[1] Hazard characteristics of wood beetle moth:
The larvae like to cluster hazards, initially invade the cortex and phloem, gradually disperse to the xylem moth, enter the dry, destroy the transport tissue, affect nutrient and water transport, and complete the larval development stage in it. The victims of the trees are light wind folds, dead branches, heavy plants die, while the larvae discharge a large number of spherical fecal debris from the fecal holes, hanging on the trunk or floating on the ground, which not only affects the effect of urban greening and landscaping, but also threatens the safety of pedestrians and vehicles.
【2】What are the difficulties in the control of wood beetle moths?
1. Hidden harm: In addition to the naked life of the lignin moth in the adult stage, all other insect states live in the phloem and xylem. Because it is less affected by environmental conditions, there are few natural enemies, the density of insect population is relatively stable, the initial harm is not easy to be found, and when the symptoms of obvious victimization occur, the best prevention and control time has been missed, and it is difficult to receive the desired prevention and control effect.
2. The life history of the small-lined wood beetle moth is long and uneven, especially from June to August, the coexistence of various insect states brings certain difficulties to the prevention and control work.
3. Wide range of hosts: In addition to white wax, the small-lined wood beetle moth also endangers many garden plants such as national locust, willow tree, ginkgo biloba, plane tree, purple weed, begonia, hawthorn and so on. These plants provide sufficient and stable food and suitable space for the small linear wood moth, resulting in a high survival rate and strong fecundity of the offspring of the insect, thus providing more insect sources for white wax.
4, ash tree weakening: in the urban green space, ash grows in the surrounding is cement or paved environment, the area of the tree pond is small, the soil is compact, the water permeability, poor air permeability, in addition, due to the deterioration of the urban ecological environment, spring dry hot wind, summer high temperature and water fishing drought stress, etc., resulting in the weakening of ash growth, insect resistance is reduced. Moreover, the transplantation of large trees often causes wounds, slow seedlings, weak trees, and is susceptible to the invasion of wood beetle moths.
[3] How to deal with the harm of wood beetle moth in actual production?
1. Strengthen conservation and management: enhance the tree posture and improve the tree's own insect resistance; in the process of excavating, transporting and planting seedlings, reduce and protect wounds (such as applying Qilin wound healing applicator); timely cut down plants that are seriously damaged and have no control value, combine winter pruning, remove insect infestation dead branches, and concentrate on treatment to reduce the source of insects.
2, pharmaceutical prevention and control: when the wood beetle moth is found to be harmful, it is necessary to take timely measures, use the Qilin Cheng attack package spray to kill, spray outside and die inside.
