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How to prevent and control peanut bacterial wilt? These methods must be mastered
The period of peanut flowering and peg penetration is the outbreak period of peanut bacterial wilt, and during this period attention should be paid to spraying for control. Control method: when peanuts begin to show buds, spray the leaf surface once every 10-15 days with a 1500-fold 70% hymexazol aqueous solution, or a 600-fold 20% thiodiazole-copper aqueous solution, evenly wetting all leaves, until water droplets begin to...
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What are the control methods for peanut viral diseases?
Peanut disease is one of the major diseases of peanut, seriously affecting the yield and quality of peanut, and it is especially severe in the production areas of northern China. For peanut viral diseases, except for bud blight, which is mainly transmitted by thrips, other diseases such as mild mottle disease, yellow mosaic disease, and common mosaic disease are transmitted through seeds and aphids, and seed-borne infected tubers...
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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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How to prevent and control weeds in rapeseed? Master the occurrence characteristics and control methods
The amount of nitrogen, phosphorus and potassium absorbed by rapeseed is nitrogen greater than potassium, and potassium greater than phosphorus. For every 1000 kg of rapeseed produced, it needs to absorb 2.76 kg of nitrogen, 0.33 kg of phosphorus and 2.06 kg of potassium. The absorption ratio of nitrogen, phosphorus and potassium is 8.38:1:6.24. A deficiency of the trace element boron will produce boron deficiency symptoms. Rapeseed plants...
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How to prevent and control persimmon tree diseases? These two methods are very practical
The main pests and diseases that persimmon trees are prone to include: persimmon angular leaf spot, circular leaf spot, anthracnose, black spot, leaf blight, powdery mildew, Eumeta variegata, Japanese mealybug, tea tussock moth, Maladera ovata, red wax scale, Homona magnanima, and small black slug moth, etc. Control methods: (1) Remove diseased fallen leaves and burn them; at the early stage of the disease, spray Bordeaux mixture, zineb, carbendazim or any one of these fungicides several times; when powdery mildew is severe, spray triadimefon. (2) Use light traps to kill adult insects; during the larval or nymph stage, spray dichlorvos, trichlorfon, fenitrothion or any one of these insecticides.
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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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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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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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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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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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