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What are the control methods for sweet potato violet root rot?
Sweet potato violet root rot, commonly known as "red vein net," "retained skin," etc. [Pathogen scientific name] Helicobasidium mompa Tanaka [Host crops] Sweet potato, potato, soybean, peanut, cotton, mulberry, tea, fruit trees, forest trees, etc. [Disease diagnosis] It damages the tubers and underground stems
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Control Methods for Stem Rot in Sweet Potato Cultivation
Sweet potato stem rot, also known as sweet potato wilt, fusarium wilt, stem blight, etc. [Pathogen scientific name] Fusarium bulbigenum Cke. et Mass. Var. botatas Wollenw. [Host crops] Sweet potato and other Convolvulaceae plants. [Disease diagnosis] Diseased seedlings show swollen, bluish roots, with the vascular bundles turning brown and the upper parts turning yellow and thin. When mature plants are affected, the diseased plants are stunted, with swelling at the stem base and a bluish halo on the surface. When the diseased part is cut open, the vascular bundles can be seen to have turned brown after infection, extending upward from the stem base for 20 to 30 cm. Apart from a few green leaves at the top, all other leaves of the diseased plant turn yellow, and the lower old leaves successively wither and drop off. In the later stage, the cortex of the diseased part cracks, appearing fibrous, and pink mold-like growth appears on the surface. When storage roots are affected, the root end becomes rotten, and a cross-section of the discolored vascular bundle area in the upper part of the diseased root shows dark brown ring-shaped spots. The pathogenic fungus is Fusarium oxysporum f. sp. batatas. Macroconidia are sickle-shaped, with slightly pointed apical cells and slightly curved tips on the end cells, having 3 to 5 septa. Microconidia are single-celled, oval to elliptical. Chlamydospores are brown and spherical.</p><p>[Disease occurrence pattern] The pathogen overwinters as mycelium and chlamydospores in diseased storage roots or attached to diseased residues in the soil. The pathogen can also survive in the soil in a saprophytic state. The pathogen mostly invades through wounds and spreads along the vascular bundles. The cut end of transplanted seedlings is the most important invasion site, and wounds on roots and leaf scars can also allow invasion. The pathogen can also invade poorly growing seedlings. The disease can spread over long distances through diseased storage roots and diseased seedlings, and over short distances mainly through soil, flowing water, and farm tools. A soil temperature of 27 to 30°C and high soil moisture favor disease development. Frequent rainfall and large amounts of rain often cause severe outbreaks of the disease.</p><p>[Control measures] (1) Select disease-resistant varieties, such as Chaoshanbai, Nanjing 92, Jinshan 247, Taichengshu, Nanruishao, Jinqing No. 9, Xuzhou 18, etc. (2) Select disease-free seed storage roots and raise seedlings in disease-free soil. (3) Before planting, soak the sweet potato seedlings in 0.2% "401" antimicrobial agent for 10 minutes for disinfection. (4) Apply fully decomposed manure. Irrigate appropriately and drain field water promptly after rain. (5) In heavily infested plots, carry out crop rotation with grain crops for more than 3 years; rotation with rice for 1 year can already be effective. (6) Remove diseased plants promptly when found and burn them in a centralized manner or bury them deeply. (7) In the early stage of disease, spray promptly with 30% Luyedan wettable powder at 800 times dilution, or 50% benomyl wettable powder at 1500 times dilution, or 40% Shuangxiaoling aqueous solution at 800 times dilution, or 50% thiophanate-methyl wettable powder at 500 times dilution. </p>
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Control Methods for Sweet Potato Scab, a Must-Read for Growers
Sweet potato scab, also known as sweet potato bud-shrinking disease, is commonly called leprosy disease, hard stem disease, etc. [Pathogen scientific name] Sphaceloma batatas Sawada. [Host crop] Sweet potato. [Disease diagnosis] It mainly damages young shoots, leaves and stems, and can also damage tubers. Leaves are mostly tender
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Occurrence Patterns and Control Methods of the Sweet Potato Hornworm
The sweet potato hornworm, Herse convolvuli (Linnaeus), belongs to the order Lepidoptera, family Sphingidae. It is distributed in Japan, and in China it is also found in Liaoning, Hebei, Henan, Shandong, Shanxi, Zhejiang, Taiwan, China, Guangdong and other provinces. It mainly damages plants of the Convolvulaceae, Solanaceae and Fabaceae. I. Morphology
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What are the control methods for sweet potato black star disease?
Sweet potato black star disease, also known as black spot disease. [Pathogen scientific name] Alternaria bataticola Ikata. [Host crop] Sweet potato. [Disease diagnosis] It damages leaves, petioles and stems. When leaves are affected, water-soaked brown spots first appear, and after expansion the lesions become round, ell
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Control Methods and Technical Key Points for Sweet Potato Brown Spot Disease
Sweet potato brown spot disease, also known as angular leaf spot. [Pathogen scientific name] Cercospora batatac Zimm [Host crops] Sweet potato, water spinach, morning glory, etc. [Disease diagnosis] It mainly damages leaves. When leaves are affected, water-soaked small spots first appear, then the lesions gradually expand
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How to Prevent and Control Sweet Potato Stem Nematode Disease? Detailed Technical Methods
Sweet potato stem nematode disease is a devastating disease in sweet potato production. It is highly destructive and spreads quickly. It can infect and cause damage during the seedbed stage, field stage, and storage stage, but it mainly infects the tubers. Affected sweet potatoes have brown, bluish skin with cracked patterns, and the tubers are light. Some tubers show no external abnormalities, but are hollow and pithy inside. This disease not only affects the quality of sweet potatoes, but also severely affects sweet potato yield.
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Control Methods for the Small Brown Planthopper at the Rice Heading Stage
The small brown planthopper (Laodelphax striatellus) not only transmits viruses that cause rice viral diseases such as rice stripe virus disease, but also congregates on the panicles to cause damage during the heading stage of late rice. To clarify the control efficacy of pymetrozine and other pesticides against the small brown planthopper at the heading stage of late rice and the application techniques, Cheng Qinhai and others from the Plant Protection Station of Haining City, Zhejiang Province, conducted field
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Occurrence and Control Methods of Rice Pests and Diseases at the Mid-Season
According to field surveys of pests and diseases by each forecasting station, the field moth population of the third generation of the rice leaf roller is currently large, and the egg mass is high. All towns are urged to actively carry out control work. I. Occurrence situation: (1) Third generation of the rice leaf roller: 1. Field moth population: According to observations at each forecasting station, the field moth population
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What are the control methods for rice stem borers?
Netizen Yeshan Judicial Office sent an email on July 4: I am a staff member of the town agricultural technology station. Right now we have too many rice stem borers here, and they are hard to control! I had farmers use Dakuangsha and dimethoate, but the feedback was that the control effect on stem borers was poor. May I ask what methods should be used to control them
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