From October 2010 to February 24, 2011, the temperature in the central and southern parts of North China, Huanghuai and Jianghuai was slightly higher than normal. The precipitation was 3 to 90% less than normal. The winter continued to be less rain (snow), causing most of Shandong. Large-scale meteorological drought occurred in most of Henan, most of Hebei, southwestern Shanxi, and northern Susong, resulting in poor growth of local forests and decreased resistance to insects. Although the precipitation process from February 25 to 28 eased the drought in most dry areas, the health of the forests was not optimistic due to the long duration of the drought and the wide range of impacts.
According to the prediction of the National Climate Center, the temperature in North China and Huanghuai in spring is normal or high, and the precipitation in the western part of Huanghuai is less, which is conducive to the occurrence and development of forestry pests. According to the forestry pest control station of the State Forestry Administration, forest pest monitoring and forecasting, forest composition and forest health analysis, as well as weather and climate trends and other comprehensive analysis and prediction (with photos): spring, north China, Huanghuai, Jianghuai, poplars The degree of damage to plain forest trees is obviously aggravated. The damage period of leaf-eating pests such as stalks and spring stalks may be advanced, and the damage of poplars is worse.
The China Meteorological Administration and the State Forestry Administration remind relevant departments and forest farmers to prepare for emergency prevention and control in advance to minimize disaster losses. Also recommended:
1. It is necessary to strengthen the monitoring and prevention of forest tree pests in spring, promote physical and biological control measures, grasp the rational use of chemical pesticides in sunny weather, and adopt comprehensive control measures according to local conditions to avoid the spread of pests.
2. Strengthen the scientific management of afforestation in spring, pay attention to breeding and planting excellent tree species, planting mixed forests of poplar and other insect-resistant trees or planting isolated forest belts, increase biodiversity, improve the ecological environment of forest land, and promote forest ecosystems. healthy growth.
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Leaf-eating pests : pests that feed on leaves. It is mainly harmful to healthy plants. The larvae feed on the leaves, often bite into gaps or leave only veins, and even eat all the light. A small number of populations sneak into the leaves, feed on mesophyll tissue, or form insects on the foliage, such as armyworms, leaf bees, and pine caterpillars. Due to the multi-battalion bare life, the growth and decline of its number is often directly restricted by factors such as climate and natural enemies. Most of the adult adults of this kind of pests do not need to be supplemented with nutrients, and their life span is short. The larval stage becomes the insect period in which it mainly ingests nutrients and causes harm. Once the damage occurs, the density of the insect population is large and concentrated. Because the real adult can do long-distance flight, it is also one of the main causes of such pests. Larvae also have the ability to actively migrate hazards over short distances. Certain types often occur periodically.
The main types of leaf-eating pests: moths, butterflies, golden tortoise shells, leaf beetles, aphids and leaf bees.
Dry pests : A type of pest that specializes in eating branches. The characteristics of dry pests are: (1) life is hidden. In addition to the adult stage of supplemental nutrition (some supplementary nutrition period is also hidden) to find breeding sites and mating activities, camp naked life, most of the time under the bark, phloem, xylem camp hidden life. It is often difficult to be discovered at the beginning of the hazard. Once it shows obvious damage, it will bring certain difficulties to the prevention and control work with the favorable opportunity to lose control. (2) The insect population is stable. Most of the life of the pests lived in the host organization for a long time, affected by the external environment, with few natural enemies, the number of insect populations fluctuated little, and the insect populations rose steadily. (3) The hazard is serious. Because these pests feed on phloem and xylem, they severely damage the transport system and cause the tree to weaken or die. Once they are invaded, they rarely recover.
There are many types of pests, including the coleoptera, the beetle, the cockroach, the cockroach, the lepidoptera, and the hawk moth. Among them, Tianniu and Jidin are the most serious.
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