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Symptom Identification and Control Methods for Oleander Leaf Spot
Symptoms: The spots occur at the edges or center of the leaves, semicircular or circular in shape; when several spots merge, they form a wavy pattern. They appear on both the upper and lower surfaces, with the upper surface slightly darker than the lower, and the spots are grayish-white or grayish-brown. In the later stage, a black powdery mold layer appears on the diseased parts, generally on old leaves. Pathogen and disease status: The pathogen is a fungus of the genus Alternaria (Alternaria sp.). Spores spread by wind and rain, and excessive rain easily triggers this disease. The disease occurs more often on old leaves, lower leaves, and tiller shoots sprouting from the roots. Control methods: 1. Strengthen
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How to control oleander aphids? A full breakdown of practical methods
Oleander aphid, also known as the kapok aphid, belongs to the order Homoptera, family Aphididae. It is distributed throughout southern China, as well as in various countries of Southeast Asia, Africa, and South America. Damage symptoms: nymphs or aphids attack oleander, stunting the growth of affected new shoots, turning the upper and lower leaves black, and causing flower buds and flowers to develop incompletely and open abnormally, reducing ornamental value. Morphological characteristics: the wingless parthenogenetic female is oval in shape, 2.3 mm long, yellow like a banana peel. The frontal tubercles are raised, higher than the median frontal tubercle; the antennae are dark, with coarse tile-like sculpturing; the rostrum reaches the middle coxae. The cornicles are long and tubular, dark
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How to control oleander aphids? Aphid control methods for garden ornamental trees
Distribution and damage The oleander aphid Aphis nerii Boyer de Fonscolombe, also known as the oleander yellow aphid, belongs to the order Homoptera, family Aphididae. It is distributed in Changchun, Shenyang, Baotou, Taiyuan, Ningbo, Guiyang, Urumqi and other places. It pierces and sucks sap from the new shoots and young leaves of oleander plants, affecting normal plant growth and flowering. Morphological characteristics: wingless female aphid body length 2 mm, body apricot yellow, antennae dark brown, legs black, cauda tongue-shaped, with 11-14 curved hairs. Winged female aphid oval, head and thorax black,
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Occurrence Patterns and Control Methods of Silkworm Muscardine
Silkworm muscardine, also known as hardening disease, is a silkworm disease caused by fungal parasitism. The bodies of diseased silkworms dry out and harden, with mycelium and conidia growing on the body surface. Because the bodies of diseased silkworms produce spores of different colors on the outside, the disease can be divided into white muscardine, green muscardine, yellow muscardine, gray muscardine and brown muscardine, among which white muscardine is the most common. There are two routes of infection: contact infection and wound infection. In both cases, pathogen spores attach to the surface of the silkworm body through media such as air and mulberry leaves, then penetrate into the silkworm body and parasitize it. If not controlled in time, it spreads very quickly and the mortality rate is relatively high.
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Identification and Control Methods of Scorpion Mold Disease
This disease is caused by green mold parasitizing and multiplying inside the scorpion's body, and it usually occurs in summer when the environment is damp and the relative air humidity is high. Symptoms of affected scorpions are as follows: in the early stage of the disease, the scorpion is extremely restless and irritable, and small yellowish-brown or reddish-brown mold spots often appear on the sternites and the anterior abdomen, which spread and expand into patches. The scorpion's growth stalls, its activity decreases, it becomes sluggish, stops eating, and may even die, with its body filled with green mold-like mycelium that forms fungal masses. Control methods: the food dish and water dish used for feeding scorpions should be washed and scrubbed clean regularly; keep the environment clean and hygienic
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Prevention and Control Methods and Technical Key Points for Canine Distemper in Foxes, Raccoon Dogs and Mink
In some fox and raccoon dog farms and mink farms, outbreaks of canine distemper have occurred. Regarding the prevention and control of canine distemper, the following views are discussed: Concerning the prevention and control of canine distemper, after decades of research, a variety of attenuated and inactivated vaccines have been developed in terms of its etiology, pathogenesis, epidemiological characteristics, clinical symptoms, pathological diagnosis and immunoprophylaxis, and many vaccines have already been supplied to the market as official commercial products. However, in recent years, the prevalence of canine distemper and the losses it has caused to the world's dog industry and fur animal breeding industry have far exceeded
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What are the control methods for the peach tree peach moth?
This insect is also known as the apricot star caterpillar and the plum moth, commonly called the red-bellied worm. Its larvae damage the buds, flowers and young leaves of peach trees. Affected peach trees not only suffer yield losses, but also decline in vigor, and in severe cases the entire tree can die. This insect mainly damages peach, plum, apricot and plum, and also harms pear and persimmon trees. It is mainly distributed in North China and Northwest China, and in recent years it has gradually spread in the Yangtze River basin, with worsening damage.
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Identification and Control Methods for the Carambola Fruit Borer Moth
The carambola fruit borer moth is commonly known as the red-line worm. Its larvae occur in large numbers during the flowering period and invade the small flowers to feed on the stamens. The peak occurrence period is usually from late June to early August, and the damage is most severe in extremely hot weather. All the damaged small flowers drop off, often causing crop failure. During the summer full-bloom period, trichlorfon 1000x solution can be sprayed continuously every 5 to 7 days to kill the pests.
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Causes and Control Methods of Eggplant Fruit Rot
"Rotten eggplant" is the collective term used by vegetable growers for gray mold, cotton blight, and sclerotinia rot. In winter and spring, eggplant fruit rot in greenhouses is mainly caused by gray mold, with sclerotinia rot as a secondary cause, and the two often occur together. The main symptoms are that the disease mainly affects small fruits and green fruits, and can also affect leaves. When fruits are affected, the residual filaments and receptacles are usually infected first, then the disease spreads to the fruit and fruit stalk, causing the peel to become grayish-white and soft-rotted. In the late stage of the disease, a large amount of grayish-white mold grows at the fruit stalk, after which the fruit loses water and becomes mummified. However, the disease conditions are mostly suitable under low temperature and high humidity
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Symptoms and Control Methods of Fasciolopsiasis
Fasciolopsiasis is a parasitic worm that lives in the small intestine of pigs. The worm body is dark red and shaped like a ginger slice. The intermediate host is the planorbis snail. The disease occurs more frequently and causes serious harm in southern areas where aquatic feed is fed. (1) Symptoms: mainly manifested as loss of appetite in pigs, slow growth and development, rough and dull hair coat, and gradual emaciation. In severe cases, it can cause enteritis, edema, failure of sows to come into heat or abortion, and even death. (2) Treatment: ① Refined trichlorfon: 0.1-0
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