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A Detailed Guide to the Occurrence and Control of Spruce Red Blight
In recent years, with the increase in the number of spruce plantings, spruce red blight has occurred severely, reaching as high as 50% in some dense forest belts, seriously weakening tree vigor and even causing tree death. The disease strikes swiftly, developing from the lower part of the tree to the upper part, from the outer edge of the crown toward the inner part, and from the base of the compound leaves toward the tip. In as little as 1 week, or at most 10 days, it can cause the leaves of the entire plant to turn yellow and then drop. The disease is caused by fungi. When temperature changes abruptly and humidity increases, the tree becomes diseased. Diseased leaves first develop small brown spots, which then expand and turn dark brown; when it rains and is humid,
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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
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Occurrence and Control Methods of Rice Dwarf Disease in Japonica Rice
I. Damage Symptoms The rice plant becomes stunted, with increased tillering, dark green leaves, and transparent yellowish-white dashed line streaks on young leaves and leaf sheaths. When the disease occurs at the seedling stage, tillering is reduced and the plant cannot head; when it occurs after booting, yellowish-white streaks appear only on the flag leaf or other leaf sheaths, and late-onset plants mostly produce neck-enclosed heads, small heads, many empty and shriveled grains, and a low seed-setting rate. II. Preventive Measures Once japonica rice contracts dwarf disease, it is very difficult to cure, so comprehensive preventive measures should be actively adopted. 1. Select disease-resistant
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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
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What is the occurrence pattern of the black locust seed chalcid?
The occurrence pattern of the black locust seed chalcid is: it has 2 generations a year, and overwinters as second-generation larvae inside the seeds. The overwintering-generation larvae begin to pupate in early to mid-May, and adults emerge and lay eggs in mid to late May. Second-generation larvae appear from late May to early June. In mid-June the first-generation larvae begin to pupate, and from late June to early July the first-generation adults emerge. Second-generation larvae appear from late June to mid-July and overwinter inside the seeds. The timing of each generation of this insect varies with climatic conditions, but it is consistent with the seed
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Occurrence and Control Methods of Oleander Aphid Infestation
Morphological characteristics: The aphid belongs to the order Homoptera, family Aphididae. Wingless parthenogenetic female: body length 2.3 mm, width 1.2 mm, oval in shape, yellow in color, with distinct markings on the eighth abdominal segment. The body surface has obvious reticulate patterns. The median frontal tubercle is raised, with a flat top; the antennae have imbricate sculpturing and are 2/3 of the body length. The cornicles are long and tubular; the cauda is tongue-shaped, constricted in the middle, bearing 11-14 long curved hairs. Winged parthenogenetic female: body length 2.1 mm, width 1.0 mm, elongate-oval; head and thorax black; antennae 3/4 of the body length. Abdominal segments 2-4 have small marginal tubercles; cornicles are long and cylindrical.
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Occurrence Patterns and Control Methods of Jujube Witches' Broom
Jujube witches' broom is a devastating disease that should be prevented rather than cured. It is very prevalent in jujube-producing regions of China. Once a tree is infected, it rarely bears fruit the following year, and even if it does, the fruit loses its edible value; after 3~4 years the entire tree dies. I. Causes of jujube witches' broom: The main cause of jujube witches' broom is the invasion of mycoplasma-like organisms. Mycoplasma-like organisms can be spread through grafting. Under natural conditions, natural root grafting between trees can also spread the disease, and some leafhoppers are also carriers of mycoplasma-like organisms. II. Integrated control measures: 1. Select and breed disease-resistant
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Occurrence and Integrated Control Methods of the Eggplant Yellow Spot Borer
Since the 1990s, eggplant has developed rapidly in Jingning County, and the county's planting area has now exceeded 1,300 hectares, with an annual total output of more than 51,000 t. At the same time, the eggplant yellow spot borer has shown an increasing trend of damage in the county, affecting the development of eggplant production. For this reason, the author conducted a preliminary study on the occurrence pattern and integrated control techniques of this pest. 1 Occurrence and damage characteristics The eggplant yellow spot borer, also known as the eggplant borer, belongs to the order Lepidoptera, family Pyralidae. Its larvae bore into and damage eggplant flower buds, stamens, ovaries, tender stems, tender shoots and
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Occurrence and Damage Characteristics of Tea Tussock Moth and Integrated Control Methods
In recent years, with the development of pollution-free tea and organic tea production, the frequency and amount of chemical pesticides used in tea gardens have decreased, and some tea gardens even do not use chemical pesticides, resulting in aggravated damage by the tea tussock moth in a short period. In the county where the author works, tea tussock moth damage has occurred for several consecutive years, and after being damaged, the tea plants were left with only bare branches, greatly affecting the economic income of tea farmers. 1. Damage symptoms: The tea tussock moth larvae bite and feed on leaves, causing leaf notches and bare branches. 1st-2nd instar larvae gather on the underside of leaves to feed on the mesophyll, leaving only the epidermis and veins, and the damaged leaves appear transparent
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Occurrence Patterns and Control Methods of the Azalea Lace Bug
The azalea lace bug (Stephanitis scotti) belongs to the order Hemiptera, family Tingidae. It is extremely widely distributed and is a major pest of azalea flowers. Its host plants are azaleas (Rhododendron spp.) and pieris (Pieris spp.), and it seriously affects the growth, reproduction and ornamental value of flowers in both genera. 1. Damage symptoms The azalea lace bug mainly damages the leaves of host plants as nymphs and adults, sucking sap and excreting feces, causing the undersides of the leaves to appear rust-yellow and the upper surfaces to show needle-point-like white spots; in severe cases the entire leaf loses its green color and turns pale, affecting plant
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