Pine borer, also known as the reddish borer, mainly harms trees such as Huashan pine, black pine and oil pine, mainly harmful to young seedlings, hindering the growth and development of the top part, resulting in a serious reduction in ornamental value, the greening effect and use value of wood can not meet expectations, so it is necessary to formulate reasonable prevention and control measures to protect the economic interests of seedling farmers and improve the application value of seedlings.
History of Matsukoe-koo Life
Pine borer occurs 2 generations per year, irregular life history, can overwinter in the damaged branches, can also overwinter in the branches, and continue to eat the damaged shoots in the following year, the pine borer will have a more serious harm to the young shoots, the larvae enter the tender shoots pulp center position, form a circular borer road, the young shoots can not get the nutrient supply in time, gradually form an upside-down drooping or wilting, if not solved in time and effectively, will lead to tree high growth damage, the top position is broken, and even the entire branch of the young tree dies, Seriously affected the healthy growth of trees.
Pine tree larva
At present, the control and use of major forestry insect pests such as pine borer in China is basically chemical pesticides, and in the case of increasingly prominent drawbacks of chemical pesticides, how to safely and effectively control such pests has also become an urgent problem to be solved.
Field identification
Adult pine borers are 10 to 16 mm long and have a wingspan of 20 to 30 mm. Grey-brown. The antennae are filamentous; the forewings are dark grey, with a large kidney-shaped white dot at the middle ventricular end, a distinct white wavy stripe between the white dot and the outer edge, two white wavy stripes between the white dot and the base of the wing, and a straight black transverse band at the hair near the outer edge of the wing. The hindwings are greyish brown and have no markings.
Endangered pine tree shoots
Prevention and control methods
1. Prune the insect branches
In the spring and winter agricultural leisure season, relevant personnel can be organized to prune the affected branches and burn them intensively to completely eradicate the larvae of the wintering generation pine borer. This method has a large workload and a long time, but the effect of controlling pine borer is remarkable, and through careful search and pruning, it can reduce more than 70% of the pine borer shoots and achieve the effect of eliminating hidden dangers.
2. Plugging method
The plugging method is the use of red paint, diesel, loess and dichlorvos made of poisonous mud for plugging operation, mainly in the spring and summer application, in the actual use process, if found in the pine borer hazard of the hole immediately blocked, to avoid omission. The sludge is made of red paint, dichlorvos, diesel and loess in a ratio of 1:1:3:5.
3. Reasonable forestry measures
In the process of forestry, mixed forests should be the mainstay, of which coniferous and broad-leaved mixed forests are the focus, and the combination of natural secondary forests and artificial afforestation can achieve good results in preventing diseases and insect pests. For closed forests with relatively high density and poor light and ventilation conditions, reasonable care measures need to be taken, and methods such as thinning and pruning are used to completely remove dead trees, weak growing trees and wind-folded trees to ensure that the sanitary conditions in the forest area meet the requirements. For areas with high incidence of pine borer, it is necessary to reasonably select tree species and select broad-leaved trees with strong resistance for planting.
Pine borer core trapping effect
4. Sexual pheromone booby-trap
After insect feathering, they often look for mates to mate, and the use of artificial female pheromone sources can attract male insects to fly, so that the occurrence period, occurrence and distribution area of pests can be monitored and predicted, and a large number of target pests are trapped to estimate the degree of pest damage and control period.
The pine borer core is a sexual pheromone that simulates the release of female pine borer adults to lure male insects, and captures them with a matching trap to reduce the chance of females mating and reproduction, thereby reducing the incidence of offspring larvae and protecting the host from insect infestations. Before the adults fly, insect pheromone attractants and traps are set up in the field, simulating the release of sexual pheromones by female adults, luring male adults to mate and lay eggs, and traps to trap male adults to monitor the occurrence of pests; a large number of pheromone attractants and traps are set up in the field to trap males in the field, resulting in a serious imbalance in the ratio of males and females in the field, reducing the mating ratio between males and females, and greatly reducing the density of the next generation of insect populations. It has the advantages of high sensitivity, strong selectivity, non-toxic, non-polluting environment, non-killing of natural enemies, and difficulty in drug resistance.
In the pine borer control area, the pine borer core and the supporting trap are hung on the trunk of the tree with a forest spacing of 1.5 to 2.0 m, if possible, the closer to the canopy, the better the trapping effect. Under normal conditions, the core is replaced once a month or so. Monitoring: 1 set /ha; control: 3 to 5 sets/ha.
Article Editor: Shi Wenchao