Heilongjiang: The area of forest pests showed a downward trend year-on-year

Original title: Heilongjiang: The area of forest pests showed a downward trend year-on-year

Northeast Network July 21 (reporter Liu Jia) Recently, the Heilongjiang Provincial Forestry and Grassland Bureau based on the first half of the province's forest defense agencies at all levels of monitoring and survey, combined with meteorological data, analysis and prediction of Heilongjiang Province in the second half of 2021 forest pest incidence area showed a downward trend year-on-year. The incidence of poplar diseases was stable, and the incidence area increased slightly compared with the same period last year; poplar leaf-eating pests showed a sharp downward trend. Pine tree disease hazards showed a downward trend, and pine pest larch caterpillar and sassafras pine borer showed a downward trend. Forestry rodent infestation shows a downward trend.

Prediction of the occurrence trend of major forest pests:

1. The occurrence of poplar diseases is basically stable. Poplar gray spot disease mainly occurs in Daqing, Harbin, Suihua and Jiamusi areas. Since mid-June, most areas of Heilongjiang Province have been on the high temperature, with more precipitation, high temperature and rainy meteorological conditions conducive to the occurrence of poplar gray spot disease, and the harm in the western region has a tendency to worsen.

2. The occurrence of poplar leaf-eating pests showed a significant downward trend, mainly in Harbin, Qiqihar and Daqing areas with mild and moderate hazards. The main species that occur are the lunar fan boat moth, the Yang boat moth and the Yang fan boat moth. The harm of poplar leaf-eating pests in Harbin area shows a downward trend, and a new hazard area of Yang Xiaozhou moth may appear in Qiqihar Yi'an. The lunar fan boat moth is harmful in Huma, Daxing'anling.

3. Pine tree diseases show a downward trend. Erythema pine needle disease showed an upward trend compared with the same period last year, mainly occurring in Jiamusi, Mudanjiang, Yichun, Daxinganling and Longjiang Sengong. Larch deciduous disease mainly occurs in Jiamusi and Longjiang Sengong areas with mild and moderate hazards, and shows a downward trend compared with last year's occurrence. The harm area of pine blight in Harbin is likely to be further increased. Sassafras pine tumor rust will occur in the Heihe area with moderate and severe hazards. In the Longjiang Sengong area, there will be the harm of Yansong lipid ulcer disease.

4. Pine tree pests larch caterpillar and sassafras pine borer have shown a downward trend, and new pine borer pests such as cut-tip beetles should be paid more attention to. Larch caterpillars occur in the central, eastern and northern regions of Jiamusi, Mudanjiang, Shuangyashan, Hegang, Heihe, Longjiang Sengong and Yichun Sengong with mild and moderate hazards. In addition to the fact that a generation of larch caterpillars still has moderate or above hazards in Yichun Sengong and Longjiang Sengong, the other areas are mainly mild hazards. In Harbin, Qiqihar and Mudanjiang areas, there are larch red-bellied leaf bees, and in Qiqihar areas, there are small areas of Ito thick silk leaf bees, and the harm situation is basically the same as last year.

5. Forestry rat infestation shows a downward trend. Except for Qiqihar and Daqing areas in the province, there are different degrees of occurrence, and the hazards are mainly concentrated in Longjiang Sengong and Yichunsengong. Longjiang forest workers are mainly moderate hazards, and the degree of harm is relatively serious. The harm of local forestry rats shows a downward trend, and there will be a small area of red-backed flat rats in Suihua local areas. (Liu Jia)