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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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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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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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The Harm and Control Methods of Angelica Leaf Spot Disease
The pathogen of Angelica leaf spot disease (Septoria SP.) is a fungus of the genus Septoria in the subphylum Deuteromycotina. The pycnidia are round, and the conidia are filiform to needle-shaped, colorless and transparent, straight or slightly curved, mostly with slightly pointed tips, with 1-3 septa. 1. Harmful symptoms: it damages the leaves. In the early stage of the disease, brown spots appear on the leaf surface, and the lesions gradually expand, with a chlorotic halo appearing around them, the edges appearing reddish-brown, and the center grayish-white. In the later stage, small black particles appear within the lesions. When the disease is severe, most of the leaf becomes reddish-brown, and finally gradually withers
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Red-leaf cherry blossom is a colorful-leaf landscape tree species with high ornamental value.
Red-leaf cherry blossom: a variety of the magnificent cherry blossom (Prunus serrulata), a deciduous small tree with large pink double flowers. Its leaves are purple-red for three seasons: in early spring the emerging leaves are deep red, from May to July they are bright red, then the older leaves gradually turn deep purple, and in late autumn when frost comes the leaves turn orange-red. The cherry blossom is a famous flowering tree; the red-leaf cherry blossom offers both flowers and foliage to admire, making it a precious ornamental colorful-leaf tree species for landscape gardens and urban greening, and also the most promising tree species to recommend first.
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How to control broadleaf weeds in potato fields?
(1) Crop rotation: Rotation reduces the density of associated weeds, changes the dominant weed community in the field, and lowers the weed population in the field. (2) Plowing and turning: After the soil is plowed and turned multiple times, perennial weeds such as Ixeris denticulata are buried underground, causing the weeds to gradually decrease or decline in vigor, thereby inhibiting their growth and achieving the purpose of weed control. (3) Inter-row cultivation and hilling: This measure not only controls weeds but also has effects such as deep loosening and water storage and moisture conservation. For example, for open-field potatoes, inter-row cultivation is generally carried out the first time when the seedlings are about 10 cm tall,
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Japanese maple (Acer palmatum) is an excellent colorful-leaf tree species.
Scientific name: Acer palmatum Thunb. English name: Japanese Maple. Family: Aceraceae. Japanese maple (Acer palmatum) is a plant of the genus Acer in the family Aceraceae, also known as chicken-claw maple, maple tree, and green maple. Morphological characteristics: deciduous small tree, up to 8 m tall. Crown umbrella-shaped and hemispherical, bark smooth, young branches green and slender. Leaves opposite, palmately 7-lobed, occasionally 5-9.
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Variety Characteristics and Planting Methods of the Red-Leaf Cherry Blossom
The red-leaf cherry blossom is a variety of the magnificent cherry blossom. After many years of selective breeding abroad, its traits have become stable. The flowers are very large, pale red, double-petaled, and have long stalks. In Shandong, it blooms in April and May, with the flowers opening before the leaves or at the same time as the leaves, and the blooms are large and showy. After the leaves emerge, they are dark red in early spring, bright red from May to July, gradually turning deep purple in the hot and rainy season, and the leaves are large and thick, turning orange-red when frost arrives in late autumn. The red-leaf cherry blossom is best propagated by grafting and cuttings. Grafting can be done between March and April or between July and August
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What are the control methods for Geranium leaf spot disease?
Symptoms mainly affect the leaves. Initially, small water-soaked spots appear, which later become circular, 2-3 mm in diameter, slightly sunken in the center, with a small brown center and a yellow spreading margin around it. Old lesions can reach 6-10 mm in diameter and, restricted by leaf veins, become irregular in shape, dark brown, with concentric rings, and bear a sparse pale black mold layer on the surface. When there are many lesions on a leaf, they can merge with each other, often causing the leaf to turn black, shrivel and die. The disease conditions mainly occur on older, weakened tissue, so it is most often seen first on the lower old leaves. Rainy weather, excessive
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What are the control methods for leaf spot disease in geraniums?
Control of leaf spot disease in geraniums: 1. For small-scale plantings, remove diseased leaves by hand and burn them in a centralized manner. 2. Improve the growing environment. In areas with severe outbreaks, practice crop rotation, avoid planting too densely so as to allow good ventilation and light penetration, and drain standing water promptly. 3. During the disease period, spray with 100 to 150 times diluted Bordeaux mixture or 80% Captan wettable powder at 500 times dilution; you can also spray a mixture of 50% Thiophanate-methyl at 1000 times dilution and 80% Captan at 500 times dilution, or spray a 45% Chlorothalonil and carbendazim mixed suspension concentrate at 1000 times dilution, which gives better results than a single fungicide.
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