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Symptom Identification and Control Methods of Rice Dwarf Disease
The symptoms are mainly distributed in the southern rice-growing areas. Also known as rice common dwarf disease, common dwarf, green dwarf, etc. After rice is infected from the seedling stage to the tillering stage, the plant becomes dwarfed, tillering increases, leaves are dark green and stiff, and in the later growth stage the diseased rice cannot head or set grain. Diseased leaf symptoms manifest as two types. In the white-spot type, dashed-line-like yellowish-white dotted streak spots parallel to the leaf veins appear on the leaves or leaf sheaths, most obvious at the base. The new leaves above the first diseased leaf all show dotted streaks, while the older leaves below generally do not. In the twisted type, under insufficient light conditions, the heart leaf emerges twisted
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Symptom Identification and Control Methods for Tulip Mosaic Virus
[Alias] Tulip soft rot. [Distribution] Tulip mosaic virus, like tulip breaking virus, is widely distributed. Sometimes the virus causes a mixed infection together with tulip breaking virus, resulting in severe mosaic. [Symptoms] Yellow stripes or fine speckled spots appear on tulip leaves, while dark spots form on the petals; in severe cases the leaves rot. [Pathogen] The pathogen causing tulip mosaic virus is cucumber mosaic virus (CMV), with spherical particles.
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Identification Methods and Management Measures for Vicious Does
Every year during the fawning and nursing period of does, at some deer farms, due to inadequate management techniques, incidents of vicious does harming newborn fawns and keepers occur from time to time. Some newborn fawns are pawed to death, and some keepers or technicians are pawed and injured. According to a survey, a vicious Sika deer doe once pawed to death 5 newborn fawns and injured 2 young and strong keepers in the first few days after giving birth. The harm caused by vicious does has led to a marked increase in fawn mortality and should be given full attention. 1 Identification
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Identification and Control Methods for the White-backed Planthopper on Rice
Hosts include rice, wild rice, corn, barley, wheat, sugarcane, sorghum, barnyard grass, and Kentucky bluegrass. The damage characteristics are the same as those of the brown planthopper. Morphological features: The macropterous male is 3.2-3.8mm long, pale yellow, with dark brown spots. The top of the head protrudes forward; on the outer side of the lateral ridges of the pronotum and mesonotum, behind the compound eyes, there is a crescent-shaped dark brown spot; the lateral areas of the mesonotum are dark brown with a yellow longitudinal band in the middle; the forewings are semi-transparent with brownish halo spots at the tips; the wing veins, face, thorax, and ventral surface of the abdomen are dark brown. The macropterous female is 4-4
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Identification and Control Methods for the White-Winged Leafhopper in Rice
Scientific name Thaia rebiginosa Kuoh, formerly mistaken for Erythroneura subrufa (Motschulsky), belongs to the order Homoptera, family Cicadellidae. It is distributed south of the Yellow River and east of Xichang, Sichuan. Damage is severe in parts of the mountainous areas of Yunnan, Guizhou and Sichuan and in Hanzhong, Shaanxi. Hosts include rice, wheat, barley, sugarcane, wild rice stem, corn, rapeseed and others. Damage characteristics: adults and nymphs pierce and suck leaf sap; damaged leaves first show scattered small white spots, which later join into dotted streak marks, or white streak marks that eventually
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Identification and Control Methods of Common Rice Diseases
1. Rice blast (1) Damage characteristics: Rice blast, also known as rice fever disease, commonly called fire blast, dangling-head blast, neck-pinching blast, etc., is one of the most widespread and most damaging fungal diseases worldwide, mainly harming the aboveground parts of the host plant. Because the damage period and site differ, it can be divided into seedling blast, leaf blast, neck blast, branch blast, grain blast, etc. Its host range includes rice, wheat, crabgrass and many other grass family plants. The rice blast pathogen mainly overwinters on diseased rice straw, and in the second year spreads from the diseased straw into rice fields to infect and cause damage. Pathogen transmission mainly relies on wind
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Identification and Control of Gyrodactylus, a Skin Fluke of Fish
Signs of infection In severe infections, fish will rub against hard objects, and the skin develops opaque patches that may become inflamed. Less severe infections may not show any easily noticeable symptoms. Affected fish Most species of freshwater and marine fish can be infected by Gyrodactylus and related species. Details of the infection Skin flukes are flukes up to 0.8 mm in length. They attach themselves to the fish's skin (occasionally to the gills) by means of a sucker with two central hooks, and feed on skin cells. At low
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Identification and Control of the Angelica Swallowtail Caterpillar Pest
The angelica swallowtail, also known as the fennel swallowtail, belongs to the order Lepidoptera, family Papilionidae. 1. Damage situation: The larvae cause damage, feeding on leaves at night, creating notches, and in severe cases eating all the leaves so that only the petioles and veins remain; they also feed on flowers and fruits. This insect has a large appetite, seriously affecting the growth of angelica and reducing yield. 2. Morphological characteristics. Adult: A large butterfly, with spring and summer forms. The summer form has a body length of about 25 mm and a wingspan of 90 mm; the spring form is slightly smaller. The body is yellow, with black stripes running longitudinally along the back. Both forewings and hindwings are yellow,
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How to Identify Poisonous Mushrooms? Simple Identification Methods Shared
In terms of color, poisonous mushrooms often have bright colors, appearing red, green, yellow, etc. Their caps often bear variegated spots, with filamentous structures or small pieces of debris or scales on the surface. Non-poisonous mushrooms generally have dull colors, flat caps, and smooth surfaces. In terms of secretions, the caps or injured parts of poisonous mushrooms often exude reddish-brown, viscous, thick liquid, etc., with a pungent or other abnormal odor. The cap changes color easily after being torn. Non-poisonous mushrooms are generally drier, and the liquid exuded after breaking is white, with a distinctive mushroom
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Symptom Identification and Control Methods of Crown Gall Disease in Cherry Blossoms
Cherry blossoms are distributed in China's Liaoning, Hebei, Anhui, Jiangxi, Zhejiang, Jiangsu and Guizhou; they are also widely distributed in Japan and Korea. They prefer light and deep, fertile, well-drained soil, and have weak resistance to smoke and dust, harmful gases and sea breeze. They have a certain degree of cold tolerance, a relatively shallow root system, and are easy to cultivate. Cherry blossoms bloom profusely in spring and are very beautiful. They are suitable for planting on hillsides, in courtyards, in front of buildings and beside garden paths. This disease is a common and serious disease of cherry blossoms, occurring widely in areas where cherry blossoms have been introduced. Zhengzhou, Chengdu, Hangzhou, Jinan, Wu
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