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What are the control methods for white rust in water spinach?
Because of the high temperature and frequent rain after early summer, water spinach is prone to white rust. Once the disease occurs, it not only reduces the yield but also affects the quality. 1. Symptoms At the early stage of the disease, spots first appear on the upper surface of the leaves as pale yellow to yellow spots, which later gradually turn brown. The spots are relatively large. On the underside of the leaves, white raised blister-like pustules form, nearly round or elliptical to irregular, sometimes coalescing into larger pustules. Later, the pustules rupture and release white sporangia. When the leaves are severely damaged, the spots are dense, the diseased leaves become deformed, and the leaves fall off.
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Correct Methods and Technical Key Points for Fertilizing Winter Rapeseed
Rapeseed "flowering but not seeding," also known as stunted non-seeding. That is, from the onset of the disease in the plant until maturity, it continues to bloom successively, but cannot set seed normally. It is a physiological disease caused by planting rapeseed on boron-deficient soil, mainly occurring in Brassica napus varieties, but in recent years it has also been found in Brassica rapa rapeseed. After the disease occurs...
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Detailed Explanation of the Grading Standards and Control Methods for Rice Blast
Grading standards Leaf blast: Grade 1 occurs sporadically, and disease can only be seen upon careful investigation. Grade 2 has slightly more incidence, with diseased leaves concentrated in the lower part. Grade 3 has widespread incidence, with diseased leaves concentrated in the middle and lower parts. Grade 4 has relatively severe incidence, with diseased leaves concentrated in the middle and upper parts, and a small number of patches appearing. Grade 5 has severe incidence, with obvious patches...
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Occurrence of Rice Blast and Rice Planthopper and Their Control Methods
I. OccurrenceRice blast: Rice leaf blast has now appeared in Helan, Qingtongxia and other places. The first appearance date was June 13, about 10 days earlier than last year. Especially after the rainfall on July 7 and 12, the field humidity was relatively high, which was very favorable for the development of leaf blast. A recent general survey in Qingtongxia showed an average diseased field rate of 16.7%, a diseased plant rate of 2.2%, and a diseased leaf rate of 0.68%. In Helan, it occurred sporadically in some drill-seeded fields. Ear-neck blast will appear at the end of July and the beginning of August. The meteorological forecast shows that in August the temperature across the region will be relatively high and precipitation in the irrigation area will be relatively low, which is unfavorable for the occurrence and development of ear-neck blast. It is expected that ear-neck blast will generally occur at a mild-to-moderate level, with moderate to severe occurrence in fields where large areas of susceptible varieties are planted in some localities. Even so, all rice-growing counties still must not take it lightly and should strengthen monitoring. For fields with disease centers, farmers should immediately be organized to spray pesticides to block the disease centers and control the spread of fungal spores. In mid- and late July, general control should be carried out in fields where leaf blast has already occurred and in fields with high density and vigorous growth, to control the development of leaf blast and prevent the occurrence of ear blast. In early and mid-August, fields where ear-neck blast has already occurred should be sprayed promptly to control the spread of the disease. Rice planthopper: A survey in Wuzhong on July 10 found a 42% insect-hole rate; in 50 sweep-net passes, there were 32 adult brown-backed planthoppers, 10 white-backed planthoppers, 37 long-winged forms, and 5 short-winged forms. There were 60 white-backed planthopper nymphs and 151 brown-backed planthopper nymphs. A survey in Qingtongxia on July 10 found 24 insects per 100 hills.
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Control Methods for the Brown Planthopper Infestation in Rice
The brown planthopper, also known as the brown rice planthopper, is commonly called ascarid worm, soft-shelled ascarid, yóu worm, and midge. Scientific name Nilaparvata lugens (Stdl), order Homoptera, family Delphacidae. The brown planthopper is one of the major pests of rice in China, causing damage in all major rice-growing regions across the country, north and south, and every year it occurs and causes damage mixed with the white-backed planthopper. The two planthoppers...
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Control Methods for the Asparagus Beetle
It is widely distributed in China, with 3-4 generations per year in Shandong and other places. Adults and larvae feed on the young stems or epidermis of asparagus, causing damage that can lead to deformed shoots or completely defoliated stems, resulting in shortened, deformed or branching shoots with clustered cladodes, and in severe cases the plants dry up and die. [Control Methods] 1. Clean the asparagus field to remove pests: promptly clean the field before winter or in early spring...
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Occurrence Characteristics and Control Methods of Common Asparagus Diseases
I. Asparagus Fusarium Wilt 1. Symptoms. Asparagus fusarium wilt, also known as wilt disease, is a soil-borne disease. Initially, individual plants in the field turn yellow and wilt, and as the disease spreads, the entire plant dies. When young stems are infected, the cladodes and stems turn brown or split longitudinally. Brown lesions can appear on the underground stems and roots of diseased plants, and in later stages the affected parts rot, producing white to pink mold. When young spears are infected, the stems are thin or unable to emerge from the soil.
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Asparagus sowing methods and post-sowing management key points
I. Sowing time: To make use of the longest growing season, sow as early as possible in spring. The sowing time should be after the frost period, when the soil temperature reaches 18-20°C. The higher the soil temperature, even up to 32°C, the faster the sprouting. Sowing too late in the growing season can result in smaller mother plants. Therefore, if sowing is done too late in the growing season, then as much as...
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Comprehensive Control Methods and Techniques for Asparagus Pests and Diseases Explained in Detail
For pest and disease control, scientific control measures must be adopted, pollution-free control techniques vigorously promoted, and highly toxic and high-residue pesticides banned, so as to effectively control pest and disease damage while keeping pesticide residues in the product within limits. In control, adopt the measures of "prevention first, comprehensive control" and carry out early prevention in good time. (1) Agricultural...
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Detailed Explanation of the Harm and Control Methods of Asparagus Pests and Diseases
In recent years, the asparagus planting area has been continuously expanding, and the degree of damage from its diseases has also increased accordingly, causing considerable losses to the vast number of asparagus growers. The main asparagus diseases include: stem blight, root rot, brown spot, damping-off, and tip blight. The common diseases in the growth process of asparagus and their control measures are introduced as follows: 1. ...
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