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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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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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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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Symptom Characteristics, Causes, and Control Methods of Oleander Witches' Broom
The oleander witches' broom pathogen mainly attacks oleander branches. The disease initially occurs mostly on individual branches, showing mass sprouting of axillary buds and adventitious buds, with many slender weak branchlets growing in clusters, stagnation of main shoot growth, shortened internodes of branchlets, and smaller leaves with indistinct mosaic patterns. Infected branchlets can produce further branchlets, and the bases of newly sprouted branchlets are swollen, pale red, and often clustered in groups. The branchlets become increasingly slender and weak, and the leaves become increasingly smaller, resembling a bird's nest in appearance, forming the typical witches' broom symptom. Most affected branchlets stand upright, and the branches have tumor-like growths. The cortex rots and peels off in strips, forming cankers,
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Causes and Control Methods of Pear Black Heart Disease
In the early stage of the disease, brown patches appear on the outer skin of the fruit core. When the browning gradually expands to the entire core, the flesh shows browning with indistinct boundaries. Affected fruit deteriorates in flavor, seriously affecting the fresh-keeping storage life of Ya pears. Depending on the storage period and conditions, this disease can be divided into two types: early-stage black heart disease and late-stage black heart disease. The former occurs 30-50 d after being placed in cold storage and is considered to be caused by low-temperature injury during storage. The latter usually occurs under earthen cellar storage conditions, mostly around the Spring Festival of the following year, and is preliminarily considered possibly
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Several Causes of Fish Gasping at the Surface and Their Prevention and Treatment Methods
Fish "gasping at the surface" is a phenomenon that frequently occurs in aquaculture production, and it is also an important sign for judging whether fish are diseased and whether water quality has changed. However, many farmers, after discovering pond fish "gasping at the surface," do not understand the cause and simply apply medication based on "experience," which often proves ineffective and may even cause mass mortality. In fact, fish "gasping at the surface" can be caused by multiple factors. According to the cause, "gasping at the surface" can be divided into the following 3 types. 1. Hypoxia-induced gasping. Hypoxia-induced gasping is caused by excessively low dissolved oxygen content in the water, causing cultured fish to swim to the relatively higher surface
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What to Do About Calcium Deficiency in Pigs? Cause Analysis and Calcium Supplementation Prevention and Treatment Methods
Symptoms: In the early stage, symptoms include reduced appetite, pica, and a tendency to lie down. In the middle stage, affected pigs move stiffly, adopt an arched-back posture, and sway in the hindquarters; some develop lameness, with the hock joints of both hind legs sunken inward and splayed apart in a "V" shape. In the late stage, affected pigs lie down and do not walk, with both hind legs extended forward beside the abdomen and both forelegs bent beneath the chest. Most affected pigs have an oval-shaped cystic swelling below and behind the hock joint. Treatment: For severe cases, first disinfect the cystic swollen areas on both hock joints, then pierce them through with a three-edged needle and drain the contents. Then administer calcium gluconate by intravenous injection, 3 g per 50
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What causes tomato stem rot? Causes and control methods
Causes of tomato stem rot and control methods
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Why Does Schisandra Drop Its Flowers and Fruit? Causes and Control Methods
I. Causes of flower and fruit drop 1. Low-temperature freezing damage causes flower drop. In some areas of the east, the last frost period occurs in mid-May, and cold air masses cause physiological chilling injury, causing some flower buds to drop. 2. Herbicide drift causes flower drop. Field herbicides are mostly used in late April and early May, which is exactly the flowering period of Schisandra. Herbicide drift directly damages Schisandra petals, preventing female flowers from pollinating normally and causing flower drop. 3. Pests and diseases cause fruit drop. The main diseases are root rot, leaf blight, and powdery mildew, which cause fruit drop when they occur severely;
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Causes of Deformed Shiitake Mushrooms in Off-Season Cultivation and Their Prevention and Control Methods
The edible mushroom industry is an important part of agriculture. Vigorously developing the edible mushroom industry can not only promote a virtuous cycle of the ecosystem, but also increase farmers' income and improve agricultural efficiency, achieving an organic unity of economic, ecological and social benefits. With the development of the edible mushroom industry, although shiitake production ranks only second, the economic benefits it delivers should rank first. How to improve shiitake yield and quality is of great significance to the many practitioners in the field. In off-season cultivation of shiitake, deformed mushrooms often appear due to inadequate production management
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