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Identification and Control Methods of the Siberian Wheat Bug
Scientific name Aelia sibirica Reuter, Hemiptera, Pentatomidae. Distribution from Heilongjiang, Inner Mongolia, and ** in the north, south to Shanxi, Shaanxi, Gansu, and Qinghai. Hosts include wheat, rice, and other grasses. Damage characteristics: adults and nymphs pierce and suck the sap of host leaves. Affected wheat seedlings develop dead hearts or white spots on the leaf surface, later twisting into a braid-like shape, with white heads and shriveled grains appearing. Morphological characteristics: adult body length 9-11 mm, yellow-brown, with black and white longitudinal stripes, head tilted downward, front end pointed and split. Scutellum
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Detailed Classification of Wheat Seedlings: Targeted Management Is Key
After wheat seedlings emerge, various types of weak seedlings often form due to the influence of natural conditions and cultivation practices. To prevent weak seedlings and manage them according to their specific symptoms, the details are introduced below: Weak seedlings caused by soil drought mostly occur in wheat fields with insufficient subsoil moisture or where moisture escapes through cracks. Their characteristics are: slow tillering, grayish-green leaf color, short and small heart leaves, slow or stagnant growth (known among farmers as "shrinking-heart seedlings"), gradual yellowing and drying of the middle and lower leaves, and few and thin roots. Key management points: combined with irrigation, apply 15 kg of ammonium bicarbonate per mu.
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Identification and Control Methods of the Wheat Stem Borer
Scientific name: Lepidoptera, Noctuidae. Also known as wheat moth, stem borer, stem-boring worm, etc. Distributed in winter wheat regions such as Shandong, Hebei, Jiangsu, and Gansu. Hosts include wheat, barley, etc. Damage characteristics: young larvae cause damage inside the leaf sheaths; after wheat and barley jointing, the larvae damage the young leaves, causing leaf curling, stunting, dead hearts, or forming damaged plants, with each larva damaging 2-3 plants. The larvae bore into the base of the first stem node, causing white heads. It is an important pest of wheat and barley in China. Morphological characteristics: adult body length 5.9-7.
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Identification of Symptoms and Prevention and Treatment Methods for Soft-Shelled Turtle Hemorrhagic Disease
Cause: Currently unknown. Symptoms: The diseased turtle's body turns black, the oral cavity turns red, and the plastron may or may not be red; it moves slowly and stops feeding, and in severe cases blood-tinged fluid seeps from the mouth and nose. Dissection shows: all internal organs and muscles are congested; the pharynx, neck, and intestines are blood-red; the liver is reddish-brown, sometimes accompanied by blood spots. The gallbladder is enlarged, the spleen and kidneys are red-black, and the lungs are black. Prevention and treatment: There are no effective treatment measures yet, so prevention can only be strengthened. 1) Thoroughly disinfect the breeding pond before disinfection, using "Yujunqing" at 7 jin per mu; 2) Before the turtles enter the pond
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Identification and Control Methods of the Copper-Green Chafer
The copper-green chafer (Anomala corpulenta Motschulsky) belongs to the order Coleoptera, family Scarabaeidae. It occurs in all regions. It damages cruciferous crops, solanaceous crops, cucurbits, legumes and other crops. [Field identification] The larvae damage the roots and stems of seedlings, causing missing plants and broken rows, and often occur mixed with the larvae of the Northeast black chafer. Adults prefer to feed on the leaves of fruit trees, forest trees and other crops. The adult body is about 20 mm long. The head, pronotum, scutellum and elytra are copper-green with a metallic sheen,
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Symptom Identification and Control Methods for Cotton Angular Leaf Spot
Symptoms: This disease not only damages cotton seedlings but also harms the stems, leaves, and developing bolls of mature plants. When seedlings are infected, the cotyledons develop water-soaked irregular or round lesions that are dark brown; in severe cases, the cotyledons wither and drop off. When true leaves are infected, small dark green spots first appear on the underside of the leaves, then expand into oil-soaked lesions; on the upper surface of the leaves, the lesions are mostly angular, and sometimes the lesions extend along the veins in irregular streaks, causing the leaves to turn yellow and drop off. When stems are infected, water-soaked main lesions appear, then expand and turn black or rot, the diseased area becomes sunken, and the pathogen bends to one side. When the terminal bud is infected, it forms a "rotten top," causing the entire plant to die.
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Identification and control methods of the licorice seed weevil
Morphological characteristics: The adult is oval, brown or dark brown, with a body length of 2.5-3mm and a width of 1.5-1.8mm; the antennae are broad and short, serrate, and do not reach the base of the elytra. The pronotum is covered with punctures and dense light brown hairs, and its posterior margin is as wide as the elytra. The elytra are covered with punctures and dense light brown hairs. The pygidium is long, slightly pointed at the tip, and the ventral surface is covered with dense light brown hairs. The inner margin of the hind femur has 1 small, indistinct tubercle near the tip; the inner margin of the hind tibia has 1 long tooth at the tip; the first segment of the hind tarsus is the longest. Damaged crop: licorice. Damage symptoms: main
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Identification and Control Methods for Common Pests and Diseases of Azaleas
Azaleas are mainly grown for ornamental purposes, and they are highly vigorous and easy to plant. Azaleas have a habit of four loves and five fears: they love partial shade, love coolness, love moisture, and love acidic soil; they fear blazing sun, fear intense heat, fear heavy fertilizer, fear coal smoke, and fear poor air circulation. Here is an introduction to common pests and diseases and their control methods; (1) Azalea diseases. During the growth process of azaleas, the diseases manifested on the leaves fall into two types: physiological diseases and pathological diseases. (1) Physiological diseases. During the growth process of azaleas, if the trace element iron is deficient, iron-deficiency chlorosis often occurs. In the early stage of the disease, the mesophyll of new leaves fades from green to yellow, while the veins remain green, thus forming leaves with a green net-like pattern. As the condition worsens, the entire leaf turns yellow-white, the leaf tips and leaf margins become scorched, and finally leaf drop results.
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Symptom Identification and Control Methods for Azalea Leaf Spot Disease
Azalea leaf spot disease, also called brown spot disease, is a common and frequently occurring leaf spot disease of azaleas. After infection, black spots form on the leaves, which gradually dry up and fall off until the plant dies. The disease mainly harms azalea leaves and is caused by infection with the fungus Cercospora rhododendri. The pathogen first appears as several small brown dots, and as these dots continue to expand, the lesions connect with each other to form patches, producing grayish-brown mold hyphae. The affected leaves begin at the petiole, turn from green to brownish-yellow, and drop early. In severe cases, it affects the growth and development and ornamental value of azaleas. The pathogen overwinters on leaves or diseased plants,
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What are the specification standards for bonsai art?
Some years ago, when Chinese bonsai specifications were rapidly developing toward the two extremes of "extra-large", "super-giant" and "ultra-miniature", Mr. Naiweng pointed out in a timely manner that tree bonsai should have "a certain sense of proportion" in their specifications, "if too large, it becomes merely planting a tree; if too small, it cannot express the beautiful posture of the potted tree." Mr. Naiweng's incisive exposition is full of dialectical philosophical thought, is scientific and artistic true insight, and is a dose of cooling medicine for overheated minds. Now, regarding the question of bonsai specifications, the bonsai world is paying increasing attention,
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