-
Carbon sink patterns of old-growth Korean pine forests in Changbai Mountain revealed
On December 23, the project "Study on Carbon Sink Function of Old-Growth Broad-Leaved Korean Pine Forests in Changbai Mountain," completed under the auspices of the Jilin Changbai Mountain Forest Ecosystem National Field Scientific Observation and Research Station, passed expert review organized by the Changchun Branch of the Chinese Academy of Sciences in Changchun. Experts held that the integration of multiple methods in this project, along with research on flux changes of components and process mechanisms, has reached the international advanced level. As the main body of terrestrial ecosystems, forests' carbon cycle processes and mechanisms play an important role in understanding forest carbon sink functions and their impact on and response to global climate change, while old
-
Occurrence Patterns and Control Methods of Cotton Pests under Drip Irrigation
With the large-scale application of drip irrigation technology for cotton, the irrigation method has been improved. It delivers water and nutrients evenly and continuously to the vicinity of the cotton root system at scheduled times and specific locations, and the supporting cotton cultivation techniques have changed accordingly, causing corresponding changes in the ecological environment of cotton field pests and their occurrence patterns. For this reason, it is highly necessary to clearly understand the occurrence patterns of cotton pests and the technical control measures under mulched drip irrigation, so as to ensure sustained and balanced increases in cotton yield. 1. Cotton bollworm 1. Occurrence level Compared with previous years, the occurrence in 2005 was moderate to severe
-
Occurrence Patterns and Control Methods of the Ginger Stem Borer
The ginger stem borer (also known as the corn borer, belonging to Lepidoptera, Pyralidae) is a major pest harming ginger. It has a very diverse diet; when causing damage, the larvae bite and feed on tender stems, then bore into the stalks (with frass and insect droppings accumulating at the entry holes), blocking the transport of water and nutrients, causing the stems and leaves above the bore holes to turn yellow, wither, and droop, and making them extremely easy to break under external force. 1. Occurrence patterns. In our area, the ginger stem borer generally produces 3-4 generations per year, and the concentrated damage period coincides exactly with the vigorous growth period of ginger plants. The larvae move between plants to cause damage, and finally the mature
-
A Detailed Explanation of the Occurrence Patterns and Control Methods of the Ginger Stem Borer
The ginger stem borer (also known as the corn borer, belonging to Lepidoptera, Pyralidae) is a major pest harming ginger. It has a very mixed diet; when causing damage, the larvae bite and feed on the tender stems, then bore into the stem (with frass and insect droppings accumulating at the entry hole), blocking the transport of water and nutrients, causing the stems and leaves above the bore hole to turn yellow and wilt, and they break very easily under external force. 1. Occurrence patterns. The ginger stem borer generally occurs 3-4 generations per year in our area, and the concentrated damage period coincides exactly with the vigorous growth period of the ginger plants. The larvae move from plant to plant causing damage, and finally the mature larvae
-
Occurrence Patterns and Control Methods of Rabbit Necrobacillosis
I. Symptoms The sick rabbit loses its appetite, salivates, and develops hard nodules on the lips, oral mucosa, and gums, which then become necrotic and foul-smelling. The swellings sometimes occur on the neck, chest, face, or front of the chest, forming abscesses or ulcers. After the lesions rupture, a foul-smelling discharge flows out, and the course of the disease lasts as long as several weeks or months. The rabbit dies from elevated body temperature, emaciation, and exhaustion. II. Prevention and Control 1. Prevention: Rabbit cages should be free of sharp foreign objects to prevent biting and fighting and to prevent skin injuries. Rabbits should be bred and raised on the farm itself. Breeding rabbits introduced from other places must be isolated and quarantined for 1 month and may only be mixed into the group if they have no other diseases.
-
Occurrence Patterns and Control Methods of the Rice Water Weevil
The rice water weevil is an internationally recognized agricultural plant quarantine pest. It first occurred in the Americas, and the countries in Asia where it occurs include Japan, South Korea, North Korea, and others. The place where the rice water weevil was first discovered in China was Tanghai County, Hebei Province, in 1987. The area where the rice water weevil was first discovered in our province was Ji'an City in the Tonghua region in August 1993. At present, this pest occurs to varying degrees in most areas of Heilongjiang Province. I. Degree of damage caused by the rice water weevil. The rice water weevil mainly damages rice, and also damages some
-
Occurrence Patterns and Control Methods of the Rice Water Weevil
The rice water weevil is an internationally recognized quarantine pest of agricultural plants. It first occurred in the Americas. In Asia, the countries where it occurs include Japan, South Korea, North Korea, and others. The place where the rice water weevil was first discovered in China was in 1987 in Tanghai County, Hebei Province. The area where the rice water weevil was first discovered in our province was in August 1993 in Ji'an City in the Tonghua region. At present, most areas of our province have this pest to varying degrees. I. Damage level of the rice water weevil. The rice water weevil mainly damages rice and also damages some grass
-
Occurrence Patterns and Control Methods of Silkworm Muscardine
Silkworm muscardine, also known as hardening disease, is a silkworm disease caused by fungal parasitism. The bodies of diseased silkworms dry out and harden, with mycelium and conidia growing on the body surface. Because the bodies of diseased silkworms produce spores of different colors on the outside, the disease can be divided into white muscardine, green muscardine, yellow muscardine, gray muscardine and brown muscardine, among which white muscardine is the most common. There are two routes of infection: contact infection and wound infection. In both cases, pathogen spores attach to the surface of the silkworm body through media such as air and mulberry leaves, then penetrate into the silkworm body and parasitize it. If not controlled in time, it spreads very quickly and the mortality rate is relatively high.
-
Occurrence Patterns and Control Methods of Jujube Fruit Shrink Disease
Jujube fruit shrink disease, also known as black rot, is a new disease of jujube trees. When this disease breaks out severely, it has a serious impact on both the quality and yield of jujube fruit. 1. Symptoms: The disease mainly damages the fruit, causing fruit rot and premature fruit drop. Affected fruit first develop a pale yellow halo on the shoulder or body, which gradually expands into sunken, irregular pale yellow lesions; then the peel becomes water-soaked and infiltrated, with scattered needle-like round brown dots, the flesh turns earthy yellow, loose and soft, and the diseased tissue becomes spongy and necrotic, while the outer peel turns dark red and lusterless. Diseased fruit
-
Detailed Explanation of the Occurrence Patterns and Control Techniques of the Jujube Leafroller
The jujube leafroller belongs to the family Tortricidae, order Lepidoptera. The jujube leafroller damages the leaves, flowers, and fruits of jujube trees, seriously affecting the yield and quality of jujube. The jujube leafroller has a single feeding habit, only damaging jujube trees and wild sour jujube, with larvae feeding on jujube leaves, flowers, and fruits. It produces 3 generations per year, overwintering as pupae in cocoons under old cracked bark and in clods of soil around the trunk. In the following year, eclosion begins in late March, with the peak of eclosion in early April; adults are strongly phototactic, and eggs are laid singly on smooth twigs and leaves. The first-generation larvae hatch in early May (before the Beginning of Summer)
条件筛选