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What are the control methods for the rice water-dropwort grasshopper?
Scientific name Gesonula punctifrons (Stal), belonging to Orthoptera, Acridoidea. It is distributed in Jiangsu, Zhejiang, Jiangxi, Fujian, Guangdong, Guangxi, Taiwan, China, Sichuan, Yunnan and other provinces and regions. Its hosts include rice, taro, lotus root, wild narcissus, sugarcane, corn and other plants. Damage characteristics: adults and nymphs chew leaves into notches or eat the leaf mesophyll leaving the epidermis; damaged leaves show small purple transverse spots, affecting photosynthesis and hindering plant growth. Morphological characteristics: female adult body length 19-22 mm, male adult
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How to Prevent and Treat Yellowing of Rice Seedlings? A Detailed Guide to Practical Methods
During rice seedling raising, yellowing of seedlings is very likely to occur, with slow tillering and weak growth, which is not conducive to cultivating strong seedlings and has a serious impact on the seedlings used for field production and even on the improvement of rice yield. I. Yellowing caused by insufficient base fertilizer. Before the three-leaf stage, seedling growth mainly depends on the endosperm; after the three-leaf stage, it mainly depends on nutrients absorbed from the soil by the root system. However, many people believe that rice seedlings are small during the seedling-raising period and do not need much fertilizer, so insufficient base fertilizer is applied, and nitrogen deficiency becomes the main cause of seedling yellowing. Countermeasure: Apply 60-75 kg of urea per hectare of seedling field,
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What are the control methods for rice bacterial leaf streak?
Rice bacterial leaf streak, or rice fine stripe disease for short, is an important disease in rice production in China. Its pathogen belongs to the genus Xanthomonas, and the bacteria mostly enter through the leaf stomata; symptoms can appear at any growth stage of rice. The lesions are short, fine, narrow stripes, with the striping appearing between the leaf veins. When held against the light, the lesions appear semi-transparent and water-soaked, turning red later; the bacterial masses on the stripes are very numerous, especially on the underside of the leaf, and are not easily dislodged when dry. Because hybrid rice still lacks disease-resistant combinations, and because the disease occurs over a wide area with an uneven distribution, this creates great difficulties for seed quarantine;
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Methods for preventing and controlling rice seedling stunting and key technical points
The main causes of rice seedling stunting are three types: phosphorus deficiency stunting, zinc deficiency stunting, and saline-alkali damage stunting. The main prevention and control methods are: 1. Phosphorus deficiency stunting generally occurs during the tillering stage after seedling recovery, manifesting as slow growth, short plants, slender and upright leaves, dark green leaf color, neat leaf cluster tips, significantly shortened leaf sheath distance, partial tillering, red leaf tips, and old leaves turning brownish-red or even dying. The main causes are (1) soil lacking available phosphorus; (2) low soil temperature, low water temperature, or soil containing hydrogen sulfide, ferrous iron
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Detailed Explanation of Common Rice Diseases and Their Control Methods
Throughout the entire growth period of rice, common diseases include rice blast, bacterial leaf streak, bacterial leaf blight, sheath blight, rice false smut, and others. (1) Rice blast: It can occur from the seedling stage to the heading stage. According to the symptoms shown at different growth stages and on different parts of the plant, it can be divided into 5 types: seedling blast, leaf blast, node blast, panicle blast, and grain blast. 1. Main symptoms (1) Seedling blast: The diseased seedling turns grayish-black at the stem base near the soil surface, and the upper part turns light reddish-brown, causing the entire seedling to curl and die. (2) Leaf blast: On
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Cold damage prevention and control methods and key technical points for rice at the panicle elongation stage
Rice pollination at the panicle elongation stage greatly needs temperature and oxygen. During this period, cold winds blowing from the northeast are very likely to occur, causing poor pollination, empty and shriveled grains, and reduced yield. Prevention and control techniques for cold damage. First, accelerate rice pollination. From late July to early and mid-August, due to meteorological causes of atmospheric circulation, the temperature generally drops to around 17, causing rice flowers to remain closed and not open, affecting rice pollination and producing empty and shriveled grains. For this kind of obstructive cold damage, scientific management of the paddy field should be strengthened so that rice accelerates through the pollination period and avoids
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What to Do About the Green Leafhopper on Rice? A Detailed Guide to Effective Control Methods
Scientific name: Homoptera, Delphacidae. Distributed in the wild rice stem (Zizania latifolia) and rice-growing areas of both southern and northern China. Hosts include rice, wild rice stem, and wild Zizania latifolia. Damage characteristics: adults and nymphs pierce and suck the sap of rice; affected leaves develop yellowish-white to light brown or reddish-brown spots, after which the leaves gradually turn yellow and dry up from the tip toward the base; excrement covers the leaf surface, forming a sooty mold-like coating; the female's egg-laying scars are initially water-soaked, then secrete white downy waxy powder; once wounds appear, the plant loses water, wilting in clumps and dying off in patches. Morphological characteristics: male adult body length 5-6.1 mm,
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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 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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Methods and Technical Key Points for Controlling the White-Backed Planthopper in Rice
Damage symptoms: Adults and nymphs gather in colonies at the base of rice plants and pierce and suck the sap, causing the leaf tips of rice leaves to lose green and turn yellow, and in severe cases the whole plant withers and dies. Damage during the heading stage can also cause difficulty in heading, blighted panicles, or browning of the panicles, along with many empty grains and other damage symptoms. Morphological characteristics: Adults have two forms, the long-winged type and the short-winged type. The long-winged adult is 4-5 mm long, grayish yellow, with a rather narrow vertex projecting in front of the compound eyes; the face has 3 raised longitudinal ridges, with the ridges light in color and the grooves dark, black and white sharply distinct; in the center of the scutellum on the thoracic dorsum grows a pentagonal white or bluish-white spot; in females the
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