What are the pests and diseases in the Daxinganling forest area? Their types and related information

1. The occurrence of forest diseases and insect pests in the Daxinganling Forest Region of Inner Mongolia in 2002

In 2002, it was predicted that the occurrence area of ??major forest pests and diseases in the Daxinganling Forest Region of Inner Mongolia was 2.32 million acres, and the actual occurrence area was 2.286 million acres. ,

The main forest pests and diseases in 2002 were Xing'an larch sheath moth, larch caterpillar, tawny tent caterpillar and forest rodent pests. In particular, the sudden forest insect pest, tent caterpillar, has a wide range of occurrence and its main host The plants include willow, poplar, birch, hazelnut, meadowsweet and other broad-leaved trees. The area where moderate or severe damage occurs is about 500,000 acres. The area where larch sheath moth occurs is still very large. It is mainly distributed in the three forestry bureaus of Chuoer, Chuoyuan and Aershan. The area with moderate or above occurrence is more than 900,000 acres. After airplane spraying with avermectin, the control effect reaches 90%. about. Effectively control the spread of the insect population. Larix caterpillars show an upward trend, and the occurrence area and damage level in 2002 increased significantly compared with 2001. In addition to Dayang Forestry Bureau, forestry bureaus such as Aershan, Urqihan, and Alihe are also distributed in patches and have a tendency to spread. Despite certain control measures, the insect population density remains high. The area and degree of damage caused by forest rodents and early larch fall disease have decreased significantly compared with 2001.

2. Prediction of the occurrence trend of major forest diseases and insect pests in 2003

Summary statistics based on the autumn survey results of forest pest control and quarantine stations of various forestry bureaus in the forest area. The main forest diseases and insect pests predicted to occur in 2003 are: larch caterpillar, larch sheath moth, woodland dry borer pest, larch early fall disease and forest rodent infestation. The predicted area of ??occurrence is 1.319 million acres. The overall situation showed a clear downward trend compared with 2002. The main forest diseases and insect pests are briefly described as follows: Larix caterpillar: After investigating the overwintering base this autumn, the average population density of this insect reached 38 individuals/plant, and the maximum population density was 180 individuals/plant. It is predicted that the occurrence area in 2003 will be 461,577 acres, of which the severe occurrence area will be approximately 106,769 acres, the moderate occurrence area will be approximately 137,370 acres, and the mild occurrence area will be approximately 217,438 acres, mainly in Aershan and Urqihan. , Dayangshu, Ali River, Tuli River, Ituri River, Chuoer, Chuoyuan, Kuduer, Genhe, Keyi River, Ganhe, Jiwen, Bila River and other forestry bureaus. In particular, the Aershan Forestry Bureau has concentrated a large area of ??larch artificial pure forest, and the area where pine caterpillars are concentrated has reached 140,000 acres. It is predicted that the degree of damage will be very serious. Therefore, the prevention and control situation next year will not be optimistic.

1. Larix sheath moth: In 2002, the occurrence of larch sheath moth in the Daxinganling forest area of ??Inner Mongolia was very serious. Only through the adoption of aircraft control measures were we able to control the further harm of this insect. According to its long-term occurrence pattern and autumn survey research, the population density of the insect will show a downward trend in 2003. It is predicted that the population density of this insect next year will be 21 individuals/100 sample branches, with a total occurrence area of ??approximately 175,904 acres, of which the severe occurrence area is approximately The area with moderate occurrence is 76,000 acres, and the area with mild occurrence is 87,904 acres. It mainly occurred in 12 forestry bureaus including Chuoer, Chuoyuan, Kuduer, Urqihan, Tulihe, Iturihe, Genhe, Keyihe, Ganhe, Jiwen, and Mangui. Stem borer pests: The predicted area where stem borer pests occur is 91,816 acres, of which 32,816 acres are severe, 44,000 acres are moderate, and 15,000 acres are mild. It mainly occurs in Mangui, Alongshan and Kuduer bureaus.

2. Other pests: mainly include sky caterpillars, gypsy moths, sawflies, plum moths and aphids, etc. The predicted area of ??occurrence is 47,000 acres, of which 10,800 acres are severe and 10,800 acres are moderate. The occurrence area is 29,100 acres, and the mild occurrence area is 7,400 acres. It mainly occurs in Jinhe, Kudu'er, Jiwen, Dayangshu, Mangui, Alongshan and other forestry bureaus. Early larch disease: The area of ??occurrence of this disease in the Daxinganling forest area of ??Inner Mongolia has been declining year by year in recent years. It is mainly related to the local weather conditions. In particular, the weather has been dry and lacks rain in recent years, which has effectively curbed the occurrence of the disease. effect. In 2002, the average susceptibility index of the disease was 37, with the highest being 80, and the average susceptible strain rate was 85%. The occurrence area is about 50,000 acres, and the mild occurrence area is about 40,000 acres. It mainly occurred in eight forestry bureaus including Mangui, Alongshan, Alihe, and Dayangshu. Other diseases: Mainly include larch dieback, Pinus sylvestris red spot, Pinus sylvestris blister rust, etc. It is predicted that the area of ??occurrence next year will be 16,000 acres, of which the area of ??severe occurrence will be approximately 1,300 acres, and the area of ??moderate occurrence will be 0.4,000 acres. acres, and the area with mild occurrence is 10,700 acres. It mainly occurs in Alihe, Mangui, Keyihe, Jiwen and other forestry bureaus.

3. Forest rodent pests: The main forest rodent pest species occurring in forest areas include brown-backed flat mice, red-backed flat mice, Mohs' vole, and giant forest mice. According to statistical analysis of rat situation surveys this autumn, the average daily capture rate is 8%, with a maximum of about 18%. It is predicted that the affected area next year will be about 435,565 acres, of which the severely affected area will be about 74,700 acres, the moderate affected area will be 164,100 acres, and the lightly affected area will be 205,765 acres.

The area and degree of rodent damage have shown an upward trend compared with 2002. It mainly occurred in 15 forestry bureaus including Delpur, Jinhe, Kuduer, Keyihe and Genhe.