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Identification and Control Methods for Geranium Alternaria Leaf Spot
Geranium Alternaria leaf spot is a common leaf disease of geranium. The pathogen has a wide host range and can attack many woody and herbaceous ornamental flowers, seriously affecting their ornamental value. Symptoms: In the early stage of the disease, chlorotic spots appear on infected leaves, and the lesions gradually expand to form larger circular spots. The spots are dark brown with concentric rings. In the late stage of the disease, a dark green mold layer appears on the spots, which consists of the conidia of the pathogen. Pathogen: The pathogen is Alternaria tenuis Nees, belonging to
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What are the control methods for crown gall disease in geraniums?
Control of crown gall disease in geraniums: 1. Before planting, find and pull out diseased plants. When necessary, disinfect the stem base of the seedlings by first soaking in 1% copper sulfate for 5 minutes, then transferring to 2% lime water for 1 minute. 2. Choose soil free of crown gall disease as nursery soil and potting soil. For potted plants that develop the disease, replace with disease-free soil. 3. For plants in the early stages of the disease, use a knife to cut away the gall, then apply lime sulfur mixture residue or Bordeaux paste to the wound, or apply methyl-acetic-iodine solution (50 parts methanol, 25 parts glacial acetic acid, 12 parts iodine flakes) to the gall, which can heal the affected area.
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What are the control methods for geranium brown spot disease?
Control of geranium brown spot disease: 1. Collecting and burning diseased and dead plant tissue is the key to controlling this disease. For potted plants or field beds, waterlogging and damp, shady conditions should be avoided. 2. Before and after the onset of the disease, spray a 50% carbendazim 800 to 1000 times dilution or a potassium permanganate 1500 times dilution, once every 10 days, for 2 to 3 consecutive sprays.
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Symptoms, Identification, and Control Methods of Black Belly Disease in Scorpions
Also called black rot, it is caused by eating spoiled feed and becoming infected with black mold, or by environmental pollution and unclean drinking water. The disease mostly occurs in summer. Symptoms of affected scorpions are: in the early stage, the scorpion's abdomen turns black, the abdomen swells, activity decreases or stops, and appetite decreases or the scorpion stops eating; in the later stage, black decay appears on the front abdomen, and squeezing it by hand causes black mucus to flow out. This disease has a short onset time and a high mortality rate. Control methods: keep the feed and drinking water fresh and clean, and frequently wash the food dish and water dish; when sick
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Control Methods and Key Technical Points for the Peach Borer
The peach borer, also known as the peach fruit borer, peach fruit worm, peach borer worm, etc. It belongs to the order Lepidoptera, family Pyralidae. 1. Morphological characteristics: The adult is about 12 mm long, with a wingspan of 22-25 mm, orange-yellow, with more than 20 black spots on the forewings and more than 10 on the hindwings. The eggs are oval, initially milky white, turning reddish-brown before hatching. The larva is 22 mm long, with a dark brown head and neck, a pale red back, and several pale brown spots on each body segment. The pupa is about 13 mm long, brown, with 6 curled anal spines at the end of the abdomen.
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Symptom Identification and Control Methods of Peach Shot Hole Disease
Peach shot hole disease is the most common leaf disease on peach trees. It occurs in peach-producing regions worldwide. It includes three types: bacterial shot hole, mildew spot shot hole, and brown spot shot hole. Among them, bacterial shot hole is the most common and is widely distributed in peach-producing regions across the country. Infection of peach trees by this disease can cause a large number of leaves to develop holes and drop off, branches and shoot tips to die, severely weakening tree vigor, affecting flower bud differentiation, and causing huge losses. In addition to harming peach trees, the three types of shot hole disease also harm stone fruit trees such as plum, apricot, and cherry. [Symptoms] Detailed
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Control Methods and Technical Key Points for the Jujube Inchworm
Also known as the jujube looper or "arched-back worm," it is the "number one enemy" harming jujube trees. Its larvae damage young buds, young leaves, and flower buds, and spin silk that tangles and hinders leaf expansion; in severe cases they can strip all the leaves, while also causing heavy damage to crops such as apple, pear, peach, potato, and chili pepper. The jujube inchworm begins to emerge from the soil in mid-March, and when the jujube buds begin to swell, the larvae start hatching and damaging the jujube buds. Its main biological characteristics are: 1. One generation per year, overwintering as pupae concentrated in the surface soil around the root collar of jujube trees;
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Symptoms and Control Methods of Potato Rhizoctonia solani Disease
〔Pathogen scientific name〕Rhizoctonia solani Kühn 〔Host crops〕Solanaceae, Fabaceae, Poaceae and many other crops; hosts are widespread. 〔Disease diagnosis〕It mainly damages young sprouts, stem bases and tubers. When young sprouts are infected, those that have not emerged rot, forming sprout rot and causing missing plants; after emergence, infection begins with yellowing of the lower leaves and brown sunken lesions on the stem base, 1-6 cm in size. The lesions and their surroundings are often covered with a purple mycelial layer; sometimes on the stem base and tubers there are sclerotia of varying sizes (1-5
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Occurrence and Control Methods of Potato Tuber Rot Nematode
Fengning and Weichang counties in the north of Chengde City plant more than 40,000 hectares of potatoes annually, producing more than 800 million kg of seed potatoes and commercial potatoes per year, with about 120 million kg stored in winter, making it one of the four major potato production bases in the country. In recent years, the damage caused by the potato tuber rot nematode has led to great losses in stored potatoes. In 1994, it caused 5%-7% loss of stored potatoes, and in severely affected potato cellars, losses reached as high as 20%-30%. According to the currently retrieved data, this nematode is widely distributed in potato-growing areas of Asia, Europe, the Americas and Africa
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Occurrence Patterns and Control Methods of the Potato Tuber Moth
The potato tuber moth, also known as the potato borer and the tobacco leafminer, is commonly called the "string-skin worm," "embroidery worm," and "potato maggot" by farmers. 1. Damage symptoms: The larvae cause damage mainly by boring and feeding, usually entering through the buds and broken skin of the tubers. Larvae hatched on the plant spin silk and spread with the wind, boring from the leaf surface into the leaf interior to feed and cause damage. After the damaged leaves wither and die, the larvae move to other leaves to cause damage. 2. Occurrence patterns: The potato tuber moth produces several generations a year, overwintering in various stages on mother tubers in the field and on the residual plants and fallen leaves of various hosts. Adult
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