-
What are the control methods for primrose brown spot disease?
Symptoms are prone to occur on the fairy primrose (Primula malacoides). Brown spots form on the leaves. The pathogen Alternaria sp. belongs to the deuteromycete Alternaria fungi. Transmission route: conidia are spread by wind and rain. Control method: spray fungicides such as 70% chlorothalonil wettable powder at 1000 times dilution in the early stages of the disease.
-
Symptoms and Control Methods of Downy Mildew on Impatiens
The scientific name of downy mildew on Impatiens is Plasmopara obducens (Schrtiter) Schroter, and it causes damage worldwide. It mainly affects the leaves and reduces their ornamental value. Symptoms: On affected leaves, chlorotic patches initially appear, irregular in shape, later turning into yellow-brown or brown necrotic spots; on the underside of the leaves there is a white mold-like growth, relatively thick and dense, and in severe cases it can cover the entire leaf, causing the leaves to scorch and affecting their ornamental value. The pathogen is called Impatiens axis downy mildew, belonging to the oomycetes. 2-5 sporangiophores emerge from the stomata,
-
How to prevent and control peach leaf brown spot and shot hole disease? Detailed explanation of prevention and control methods
Occurrence pattern: The pathogen mainly overwinters as mycelium on diseased leaves or in the diseased tissues of affected shoots. In the spring of the following year, as temperatures rise and rain arrives, the pathogen produces conidia. The conidia spread by wind and rain, infecting leaves, new shoots and fruit. The disease occurs more severely in orchards on low-lying land with poor ventilation and damp, shady conditions, or in rainy years. Prevention and control methods: (1) Agricultural control: reasonable pruning. Keep the orchard well ventilated and well lit, reduce humidity in the peach orchard, and create conditions unfavorable for the disease.
-
Symptoms and Control Methods of Bacterial Shot Hole Disease in Peach
[Distribution] It occurs throughout the country, especially in coastal areas, lakeside areas, orchards with poor drainage, and rainy years, often causing severe outbreaks. If control is not timely, it can easily cause massive leaf drop, reduce nutrient accumulation, and affect flower bud formation. It not only weakens tree vigor and reduces the yield of the current year, but also affects fruiting in the following year, resulting in poor harvests. [Symptoms] Water-soaked, pale yellow small spots appear on the leaves, then expand into red round spots, and subsequently turn brown, with the edge darker than the center. Around the edge there is a semi-transparent pale yellow halo. The edge is prone to forming an abscission layer, creating round shot-hole spots. When several lesions join together, the shot-hole shape becomes irregular; in severe cases, a single leaf may have dozens of lesions, and diseased leaves fall early.
-
Detailed Explanation of Garlic Pest Species and Control Methods
In garlic production in Dali City, two main types of insect pests occur, namely the South American leafminer (Liriomyza huidobrensis) and the leek moth (Acrolepiopsis sapporensis). The South American leafminer mainly causes damage in the early stage of garlic growth (when there are 3--6 leaves); the leek moth causes damage throughout the entire growth period of garlic, with more severe damage in the middle and late stages. For control, the South American leafminer can be treated when garlic has 3--4 leaves, according to the situation, by selecting avermectin-type 1.8% Haijimie emulsifiable concentrate at l0--15 milliliters per mu, 1.8% Aifuding emulsifiable concentrate and Chongmanguang emulsifiable concentrate at 20--30 milliliters
-
Control Methods and Technical Key Points for Garlic Viral Disease
The garlic planting area in Eryuan County is over 30,000 mu, with an output value exceeding 100 million yuan. In recent years, due to continuous planting, viral disease has occurred widespread, leading to variety degeneration, decreased yield and quality, and seriously affecting the income of garlic farmers. 1. Disease symptoms: In the early stage of the disease, yellow striped markings appear along the leaf veins, plants become dwarfed, new leaves do not extend properly and are distorted. When the disease occurs after bolting, the parts below the flower bud of the garlic scape gradually lose green color and turn white. Plants have few fibrous roots, and in severe cases the garlic bulbs become smaller and hardened. 2. Environmental conditions for disease occurrence: Mainly the garlic seed carries the virus. During the seedling stage
-
Detailed Explanation of Garlic Disease Types, Causes, and Prevention and Control Methods
I. Types of Garlic Diseases 1. Round leaf (also called barrel) This disease mainly manifests during the period before the garlic scape emerges; the leaves at the top of the garlic form a barrel shape that tightly wraps the garlic scape inside the barrel, causing the scape to become enclosed or broken. 2. Garlic branching That is, multiple branches on one plant, like grandfather and grandson, with nutrients dispersed; the main garlic scape lacks sufficient nutrients and is thin and short. 3. Spots This disease mainly manifests before the garlic scape bolts; spots appear on the surface of the garlic scape, including white spots, yellow spots, and red spots, causing the garlic scape to rot or become moldy. 4. Garlic glume turning red or flowering
-
How to prevent and control swine lungworm disease? Prevention and control methods every pig farmer must read
Swine lungworm disease is a helminthic disease caused by Metastrongylus nematodes parasitizing the bronchi and bronchioles of pigs. It is highly harmful to pigs, often causing bronchitis and even pneumonia, and is prone to complicating with pulmonary infectious diseases such as swine pasteurellosis and swine enzootic pneumonia. It often occurs as an endemic disease, mostly infecting pigs when they eat earthworms containing infective larvae. One month after infection, piglets mainly develop coughing, especially obvious when exercising in the morning and evening or when encountering changes in external temperature. Sometimes purulent mucus flows from the nostrils, and there are eye secretions. The appetite of sick pigs is generally normal, but growth and development stagnate, and they gradually become emaciated.
-
Occurrence Patterns and Control Methods of Cotton Seedling Diseases
Cotton seedling diseases are characterized by a concentrated onset period, generally occurring 15-30 days after sowing. The primary infection source comes mainly from the soil, with a small portion from seeds. Around April 20 this year, many provinces experienced continuous rainy and low-temperature weather, so seedling diseases are bound to be severe, and timely control measures should be taken in all areas. I. Symptom Manifestations (1) Damping-off. When cotton seedlings are affected before emergence, it causes seed and sprout rot. When disease occurs after seedling emergence, lesions initially appear as yellowish-brown and later turn black and sunken at the base of the young stem near the soil surface. The lesions gradually expand,
-
Control Methods and Rescue Measures for the Three Major Types of Pesticide Damage in Cotton
1. Strict operation and effective prevention. When using the various types of pesticides mentioned above on cotton, the operating procedures must be strictly followed and the pesticides used rationally (including the type, concentration, method and timing of application, etc.), so as to give full play to the pesticide's efficacy while reducing costs and preventing pesticide damage. 2. Timely "rescue" to eliminate the "danger". After pesticide damage occurs, a large amount of water can be sprayed on the leaves to wash it off; in the soil, irrigation, drainage to wash out the pesticide, or neutralization and detoxification with safeners can be used. If Bordeaux mixture is mistakenly used, since copper ions cause the pesticide damage, 0.5%-1% lime milk can be sprayed; spray equipment that has been used for
条件筛选