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Identification and control methods of the licorice seed weevil
Morphological characteristics: The adult is oval, brown or dark brown, with a body length of 2.5-3mm and a width of 1.5-1.8mm; the antennae are broad and short, serrate, and do not reach the base of the elytra. The pronotum is covered with punctures and dense light brown hairs, and its posterior margin is as wide as the elytra. The elytra are covered with punctures and dense light brown hairs. The pygidium is long, slightly pointed at the tip, and the ventral surface is covered with dense light brown hairs. The inner margin of the hind femur has 1 small, indistinct tubercle near the tip; the inner margin of the hind tibia has 1 long tooth at the tip; the first segment of the hind tarsus is the longest. Damaged crop: licorice. Damage symptoms: main
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How to prevent and control licorice rust? Detailed explanation of prevention and control methods
The pathogen is a basidiomycete fungus, mainly affecting the leaves. On the underside of infected leaves, yellow-brown blister-like lesions appear on one side; after the epidermis ruptures, brown powder is released, which are the uredinia and urediniospores of the pathogen. From August to September, dark brown teleutosori form. Prevention and control methods: 1. Collect diseased plant leaves and burn them. 2. At the early stage of disease onset, spray 0.3-0.4 degrees Baume lime sulfur mixture or 97% dithianon sodium 400-fold solution.
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Control Methods and Technical Key Points for Licorice Brown Spot Disease
Brown spot disease is an infection caused by a type of imperfect fungus (Deuteromycete), mainly damaging the leaves. Its symptoms are: circular or irregular lesions appear on the leaves, the center of the lesion is grayish-brown, the edge is brown, and black mold-like growth occurs on both sides of the lesion. Control methods: spray 1:1:100-1:1:160 Bordeaux mixture or spray 70% thiophanate-methyl wettable powder at 1500x-2000x dilution.
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Symptom Identification and Control Methods for Cotton Angular Leaf Spot
Symptoms: This disease not only damages cotton seedlings but also harms the stems, leaves, and developing bolls of mature plants. When seedlings are infected, the cotyledons develop water-soaked irregular or round lesions that are dark brown; in severe cases, the cotyledons wither and drop off. When true leaves are infected, small dark green spots first appear on the underside of the leaves, then expand into oil-soaked lesions; on the upper surface of the leaves, the lesions are mostly angular, and sometimes the lesions extend along the veins in irregular streaks, causing the leaves to turn yellow and drop off. When stems are infected, water-soaked main lesions appear, then expand and turn black or rot, the diseased area becomes sunken, and the pathogen bends to one side. When the terminal bud is infected, it forms a "rotten top," causing the entire plant to die.
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What to Do About Acute Bacterial Wilt in Cotton? Causes and Control Methods
Fusarium wilt symptoms in mature plants take several forms. Leaves may also show yellowing-type and net-vein-type patterns, and defoliation occurs easily. On severely affected plants, the top leaves are crinkled and deformed, dark green in color, with shortened internodes and a stunted plant form. After rain, an acute wilt type often appears, with the cotton plant suddenly losing water. The leaves wilt and turn green-wilted rapidly, droop, and often drop off leaving bare stems. Disease pattern: Cotton Fusarium wilt mainly overwinters in the seeds of diseased plants, diseased plant residues, soil and manure. The transport of infected seeds and infected oilseed cake fertilizer is the main cause of disease outbreaks in new areas. Cultivation and management in cotton fields of affected areas
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Occurrence Patterns and Control Methods of Cotton Red Leaf and Stem Blight
Disease symptoms and occurrence patterns: Cotton red leaf and stem blight is an explosive disease that frequently occurs in the middle and late stages of cotton growth. It can cause leaves to turn red from bottom to top until they drop off. The leaf veins remain green, the leaf mesophyll turns red, and the leaves become thicker, brittle, and wilted before finally dropping. When the stem is cut open, it does not change color, which distinguishes it from cotton Fusarium and Verticillium wilt. Generally, in old cotton-growing areas, the disease is more severe in cotton fields with continuous cropping year after year, sandy soil, too shallow a plow layer, or insufficient fertilizer lacking potassium fertilizer. Drought in the middle and late stages, along with severe potassium and zinc deficiency in the soil, can also easily accelerate the occurrence of this disease.
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A Detailed Guide to the Harm Caused by Cotton Summer Aphids and Their Control Methods
Cotton summer aphids are the offspring of aphids that reproduce during the cotton seedling stage. Summer aphids begin to harm cotton after the onset of the dog days, and their harmfulness is far greater than that of seedling-stage aphids. The oily excrement excreted by summer aphids covers the cotton leaves, reducing leaf surface function, hindering the normal progress of photosynthesis, and obstructing the transport of nutrients, causing the tender leaves of cotton to curl and shrink, which in turn causes cotton squares and bolls to drop. Therefore, doing a good job in controlling summer aphids is an important measure for striving for high yields and early production of summer bolls. 1. Grasp the timing of control: cotton summer aphids usually
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Causes of Cotton Excessive Vegetative Growth and Control Methods
The phenomenon in which vegetative organs such as stems, branches and leaves of the cotton plant grow excessively, causing an imbalance between vegetative growth and reproductive growth, is called excessive vegetative growth, commonly known as "runaway growth." After cotton squaring, vegetative growth and reproductive growth proceed simultaneously. If vegetative growth is too rapid and reproductive growth is inhibited, it will cause shedding of squares and bolls, and in severe cases, no bolls will set. Causes of excessive vegetative growth: mainly excessive application of fertilizer and water. From squaring to the early flowering stage is the period of fastest vegetative growth in the entire life of cotton. If nitrogen fertilizer is supplied in excess, it will cause an imbalance in the carbon-to-nitrogen metabolism ratio
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What are the prevention and control methods for chicken embryos dying before pipping?
During incubation, it is very common for normally developed chicken embryos to be suffocated before pipping due to various factors such as an overly hard eggshell, limited space for the chick embryo's head to move, or its beak tip being too far from the eggshell. So, how can this phenomenon be prevented? 1. Turning the eggs. The first 10 days of incubation are the critical period for blastoderm positioning. To ensure the embryo's eye spot and head develop along the blunt-end shell edge of the hatching egg, so as to help the chick's beak tip pip the shell, the eggs should be turned frequently during this stage. During operation, the blunt end of the hatching egg should be kept facing up
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Effective Control Methods for Haemophilus parasuis Disease
In recent years, with immunosuppressive diseases such as porcine reproductive and respiratory syndrome (PRRS) and porcine circovirus disease invading pig herds to varying degrees, and with another immunosuppressive disease in most pig farms, mycoplasma pneumonia, "adding fuel to the fire," the immunity and resistance of pig herds have been severely reduced, and mixed infections of diseases have become very common. In technical services, we have found that Haemophilus parasuis disease often appears as a secondary or concurrent infection in the nursery and growing barns of some pig farms, greatly increasing the mortality and culling rate of pig herds and causing huge losses to pig farms.
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