Harmful symptoms and integrated control techniques of Dendrolimus punctatus
Mason pine caterpillar is a common insect in the forest ecosystem, and today we talk about the prevention measures the masson pine tree farm Nanshan, Nanshan Forest Farm is located in Chongqing Nan'an District, it has a large area of ​​Masson Pine. Let's study the current situation and control measures of Dendrolimus punctatus in Nanshan Forest Farm in Nan'an District.
Nanshan Forest Farm is located in the southern subtropical humid monsoon climate zone of the Yangtze River valley area, has obvious monsoon climate, dry summer heat, easily lead to outbreaks of leaf-eating insects such as caterpillars Masson pine. To strengthen the management of forest resources, we must attach great importance to prevention and control of Dendrolimus punctatus, from the source to reduce the probability of occurrence.
1 status pine caterpillar
For the effective monitoring of trends in the occurrence of D. punctatus, placed in mason pine forest black light, results showed that caterpillars are mainly concentrated in the area in previous years, the occurrence of more serious; the ratio of the number of male and female worms and caterpillars collected from the black light Dendrolimus view, female The number is large. Through monitoring and analysis, the prevention and control of pine caterpillars must be done.
2 Control measures for Dendrolimus punctatus
2.1 Biological control
2.1.1 Application of Beauveria bassiana Beauveria bassiana is one of the most common drugs used in the prevention and control of pine caterpillars in recent years. It is a fungal insecticide with strong efficacy, but it is harmless to humans and animals. Less pollution. Beauveria bassiana is divided into powder and emulsion. In the practice of prevention and control, the application amount is 10 billion spores per gram of powder, 0.5 kg per 667 m2; the emulsion is 60 billion spores per mL, 150 mL per 667 m2, before the larvae wintering (late November) and after wintering (February-March) The application effect is most ideal.
2.1.2 Release of Trichogramma to adopt the biological control method of “control insects with insectsâ€, and release parasitic wasps such as Trichogramma on the field of the field dam, Fangniuping, Dagukou, French Church, etc. It is consistent with the approximate occurrence period of pine caterpillars. When the bees and eggs meet, the virus carried by the parasitic eggs can kill pine caterpillars on a large scale. The operation is simple, non-toxic and harmless to humans and animals and the environment, and the control effect is better.
2.2 physical control
The adult caterpillars have strong phototaxis characteristics. In the wintering of the caterpillars of Dendrolimus punctatus, the first generation of the mature larvae of the caterpillars of Dendrolimus punctatus began to place black light (220 volts, 20 W) in the forest area. Generally choose to open in the open space, 6.7~10hm2 set 1 black light, placed in the dense forest area of ​​masson pine in May, choose the dark, hot, windless night to turn on the light around 9 o'clock, the best insect attracting effect, effectively reduce The next generation of pine caterpillar insect density.
2.3 Ecological control
The adoption of ecological control methods is an effective way to control pests and diseases in forest areas. In combination with the project of Nanshan forestry transformation and ecological barrier construction, we planted species such as Schima, Chixiao and Fengxiang, and created multi-tree species and multi-level mixed forests with needle width, four seasons of flowers, and shrubs and grasses, and gradually reduced masson pine. The proportion of pure forests creates an environment that is not conducive to the survival and reproduction of pine caterpillars. In the area where the pine forest is closed in the NiuPingping forest area, the management of forest tending and thinning should be strengthened in time to remove the weeds under the forest.
In the process of forest resource management, we must increase the monitoring of forest pests and take targeted prevention and control measures, focusing on biological control, effectively controlling the occurrence of Dendrolimus punctatus and ensuring forest ecology. For more agricultural technology knowledge, please continue to pay attention to Hui Nong Network!
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