Please tell me what kinds of pests and diseases there are in Daxinganling forest area and related information.

I. Occurrence of Forest Diseases and Pests in Daxinganling Forest Region of Inner Mongolia in 2002

In 2002, the predicted area of main forest diseases and insect pests in Daxinganling forest region of Inner Mongolia was 2.32 million mu, and the actual area was 2.286 million mu.

In 2002, the main forest pests and diseases were Larix gmelinii, Dendrolimus punctatus, Dendrolimus punctatus and forest rodents, especially sudden forest pests and diseases, which occurred widely. The main host plants are willow, poplar, birch, hazelnut, Spiraea and other broad-leaved trees, and the serious occurrence area is about 500,000 mu. The occurrence area of larch sheath moth is still very large, mainly distributed in Chuo 'er, Chuo 'yuan and Aershan forestry bureaus, with a moderate occurrence area of more than 900,000 mu. After spraying avermectin by plane, the control effect is about 90%. Effectively control the spread of insect populations. Dendrolimus punctatus showed an upward trend, and the occurrence area and damage degree increased significantly in 2002 compared with 200 1 year. In addition to Dayangshu Forestry Bureau, Aershan Forestry Bureau, Urqihan Forestry Bureau and Alihe Forestry Bureau are also in patch distribution, and there is a spreading trend. Although some control measures have been taken, the population density of this insect is still high. Compared with 200 1, the occurrence area and damage degree of forest rodent damage and larch premature aging disease have decreased greatly.

2. Forecast of occurrence trend of main forest diseases and insect pests in 2003

According to the autumn investigation results of forest pest control and quarantine station of forest forestry bureau, statistical summary was made. It is estimated that the main forest pests and diseases in 2003 are Dendrolimus punctatus, Larix gmelinii, borer in burned areas, early autumn disease of Larix gmelinii and forest rodents. The predicted occurrence area is 1.3 1.9 million mu. Compared with 2002, the overall trend is obviously downward. The main forest pests and diseases are briefly described as follows: Dendrolimus superans: After the investigation in the wintering base this autumn, the average population density of this insect reached 38/plant, and the highest population density was 180/plant. It is predicted that the occurrence area in 2003 is 4615.77 million mu, of which the severe occurrence area is about 106769 million mu, the moderate occurrence area is about137.37 million mu, and the mild occurrence area is about 2174.38 million mu, mainly occurring in Aershan, Urqihan and Xinjiang. In particular, Aershan Forestry Bureau concentrated a large area of pure larch plantation, and the occurrence area of Dendrolimus punctatus reached 6.5438+0.4 million mu. It is predicted that the damage will be very serious. So the form of prevention and control next year will not be optimistic.

1. Larch sheath moth: In 2002, the occurrence of Larch sheath moth was very serious in Daxinganling forest region of Inner Mongolia. Only by taking airplane control measures can the further harm of this insect be controlled. According to its long-term occurrence law and autumn investigation, the population density will show a downward trend in 2003, and it is predicted that the population density of this insect will be 21100 next year. The total occurrence area of branches is about 175904 mu, in which the severe occurrence area is about 14 mu, the moderate occurrence area is 76,000 mu, and the mild occurrence area is 87,904 mu. It mainly occurs in twelve forestry bureaus, such as Chuo 'er, Chuo 'yuan, Kudu 'er, Urqihan, Tuli River, Ituri River, Genhe River, Yike River, Ganhe River, Jiwen and Mangui. Borer: It is predicted that the occurrence area of borer is 91816000mu, of which the severe occurrence area is 32816000mu, the moderate occurrence area is 44000mu, and the mild occurrence area is15000mu. Mainly occurred in Mangui, Alongshan and Kuduer Bureau.

2. Other pests: mainly caterpillars, gypsy moths, sawflies, moths and aphids. The predicted occurrence area is 47,000 mu, including severe occurrence area of 6.5438+0.08 million mu, moderate occurrence area of 29.10.000 mu, and mild occurrence area of 0.74 million mu. Mainly occurred in Jinhe, Kuduer, Jiwen, Dayangshu, Mangui, Alongshan and other forestry bureaus. Larch premature senility: In recent years, the occurrence area of this disease in Daxinganling forest region of Inner Mongolia has been decreasing year by year, which is mainly related to the local weather, especially the lack of rain in recent years, which has effectively curbed the occurrence of this disease. In 2002, the average susceptibility index of the disease was 37, the highest was 80, and the average susceptibility rate was 85%. The occurrence area is about 50,000 mu, and the mild occurrence area is about 40,000 mu. It mainly occurs in 8 forestry bureaus such as Mangui, Alongshan, Alihe and Dayangshu. Other diseases: mainly larch shoot blight and Pinus sylvestris var. mongolica red spot. Pinus sylvestris var. mongolica blister rust. Mongolia and so on. It is predicted that the occurrence area will be 1.6 million mu next year, of which the severe occurrence area will be about 0. 1.3 million mu, the moderate occurrence area will be 0.4 million mu, and the mild occurrence area will be 1.7 million mu. Mainly occurred in Ali River, Mangui, Keyi River, Jiwen and other forestry bureaus.

3. Forest rodent infestation: The main forest rodent infestations in forest areas include Rattus fuscipes, Rattus fuscipes, Microtus fortis, Apodemus Dalbergiae, etc. Through the investigation and statistical analysis of rat situation this autumn, the average daily capture rate is 8%, and the highest is about 18%. It is predicted that the occurrence area will be about 435,565 mu next year, including 74,700 mu of severe occurrence area, 1.64 1 10,000 mu of moderate occurrence area and 205,765 mu of mild occurrence area. Compared with 2002, the occurrence area and damage degree of rodents have an upward trend. Mainly occurred in Delingha, Jinhe, Kuduer, Yike River, Genhe, etc. 15 Forestry Bureau.