Nanshan Forest Farm is located in the southern Yangtze River Valley region of the subtropical monsoon humid climate zone, with obvious monsoon climate, high temperature and drought in summer, which can easily lead to the outbreak of leaf-eating pests such as Masson pine caterpillar. In order to strengthen the management of forest resources, we must attach great importance to the control of Pinus massoniana and reduce the probability of occurrence from the source.
1 Masson pine caterpillar occurrence status
In order to effectively monitor the occurrence trend of Pinus massoniana, black light lamps were placed in the Masson Pine forest area, and the results showed that pine caterpillars were mainly concentrated in areas where they occurred more seriously in previous years; from the perspective of the number of Pinus massonianas collected by black lights and the proportion of male and female insects, the number of females was large, and through monitoring and analysis, it was necessary to do a good job in the control of pine caterpillars.
2 Horsetail pine caterpillar control measures
2.1 Biological control
2.1.1 The application of albicans hypersporum is the most common drug used in forest farms in the control of pine caterpillars in recent years, which is a fungal insecticide with strong efficacy, but it is harmless to humans and animals, with less residue and pollution. There are two types of white zombies, powder and emulsion. In the control practice, the amount of powder with a content of 10 billion spores per gram was 0.5 kg per 667 m2, and the emulsion was 6 billion spores per mL, with a dosage of 150 mL per 667 m2, and the application effect was most ideal before the larvae overwintering (late November) and after overwintering (February-March).
2.1.2 The release of red-eyed bees adopts the biological control method of "treating insects with insects", releases parasitic bee eggs such as red-eyed bees in areas such as dams, cattle grazing flats, large passes, French churches and other areas where the forest farms focus, and the bee release period is roughly the same as that of pine caterpillars, that is, when bees and eggs meet, the virus carried by the parasitic eggs can kill pine caterpillars on a large scale, the operation is relatively simple, non-toxic and harmless to humans and animals and the environment, and the prevention and control effect is better.
2.2 Physical control
Using the strong phototropism characteristics of pine caterpillar adults, insecticidal lamps were placed in the forest area during the overwintering generation of Pinus massoniana, and the first generation of Pinus massoniana pupae pupae. Generally choose to set up in the open, insecticidal lamp is a physical control method that uses pest phototropism for booby-trapping. Zhengzhou Ou keqi OK-TS2 frequency vibration insecticidal lamp is the use of pests strong light-oriented, wave-oriented, color-oriented, tendency information characteristics, the wavelength of light, band, frequency set in a specific range, close to the light, long-distance with waves, to lure the pest itself to induce adult insects to throw lights, the lamp with frequency vibration type high-voltage power grid touch killing, so that pests fall into the insect bag under the lamp, to achieve the purpose of killing pests. Widely used in agriculture, forestry, vegetables, warehousing, tea, tobacco, gardens, scenic spots, gardens, parks, schools, enterprises and institutions, greenhouses, vineyards, aquaculture, animal husbandry and so on.
2.3 Ecological control
The use of ecological control methods is an effective way to control pests and diseases in forest areas. Combined with projects such as the transformation of the Nanshan forest phase and the construction of ecological barrier areas, vigorously plant tree species such as wood lotus, laughing, and maple incense, create multi-tree species and multi-level mixed forests that combine needles and broads, flowers in all seasons, and qiao shrubs, gradually reduce the proportion of pure forests of Masson pine, and create an environment that is not conducive to the survival and reproduction of pine caterpillars. For areas with large closure of pine forests in the cattle grazing forest area, timely strengthen the management of forest care and inter-cutting, and remove weeds under the forest.
In the process of forest resource management, we must increase the monitoring of forest pests, and take targeted control measures, mainly biological control, effectively control the occurrence of Masson pine caterpillars, and ensure forest ecology.