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Symptoms and Control Methods of White Root Rot in Cherry Blossoms
Symptoms White root rot has become increasingly severe in damaging garden trees in recent years, especially in cherry blossoms. The disease mainly occurs on the roots of trees. After the fibrous roots are infected, it gradually spreads to the lateral roots and the main root. Its characteristic symptom is a layer of grayish-white silky mesh covering the diseased roots; afterward the roots rot, causing the cortex to separate, and the root absorption function is severely lost. In mild cases, the cherry blossom grows poorly and the tree vigor weakens; in severe cases, it causes death. Pathogen and disease pattern The pathogen is Dematophora necatrix Harting, and its sexual stage is the rare Rosellinia necatrix. This fungus also infects many plants such as poplar, willow, ginkgo, paulownia, wintersweet, crabapple, mountain peach, tea, spruce, cedar, flowering almond, tree peony and Chinese peony. The pathogen overwinters as mycelium, rhizomorphs and sclerotia in the soil or in diseased plant residues. White root rot is a soil-borne root disease, and its infection cycle is not obvious. In April-May of the following year, under conditions of abundant rain and moist soil, the rhizomorphs spread and transmit through the soil. The pathogen can invade through wounds and lenticels on young roots. Generally, trees planted in poorly drained, weak-growing and waterlogged low-lying land are more severely affected. In the Beijing area, white root rot occurs severely from July to August; later, small black dots, which are the pathogen's perithecia, grow on the mycelial membrane.
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What are the control methods for the main pest mites of Sichuan cherry blossoms?
In the Mianyang area of Sichuan, the mites harmful to cherry blossoms are mainly the European red mite (Panonychus ulmi), the hawthorn spider mite (Tetranychus viennensis), and others. The larvae, nymphs and adult mites suck the leaf sap; the damaged leaves develop many small chlorotic spots, and in severe cases the leaves turn pale and scorch, which not only affects plant growth and flowering but also affects photosynthesis. Morphological characteristics: the female adult of the European red mite is 0.45 mm long and 0.29 mm wide, round, with a raised back, dark red; the male adult is 0.3 mm long. Summer eggs are orange-red, winter eggs dark red.
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What are the control methods for trunk-boring pests of cherry blossoms?
The longhorn beetles that harm cherry blossoms usually include the star longhorn beetle, the glossy-shouldered star longhorn beetle, and the peach red-necked longhorn beetle. 1. The star longhorn beetle has 1 generation per year. When adults emerge from late May to early June, capture the adults: before the star longhorn beetle adult lays eggs, it first bites a notch about 2 mm deep and about 8 mm long in the bark in the shape of a "" or "", and then lays eggs inside it. During the peak egg-laying period in mid-to-late July, search for the notches on the trunk and destroy the eggs. During the stage when newly hatched larvae are active in the cortex, use a grafting knife to pick the larvae out. For larvae that have bored into the xylem, it is necessary to
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What are the control methods for cherry root gall disease?
The gorgeous cherry blossom is deeply loved by people, but it is prone to a deadly root gall disease. This disease mainly occurs on the roots and on the trunk and side branches of the aboveground part of the cherry tree. In the early stage of the disease, the root crown swells into spherical or hemispherical tumor-like growths; young galls are white, soft in texture, and smooth on the surface. Later the galls gradually enlarge, become hard in texture, brown or dark brown, with a rough, cracked surface, and spread gradually from the root crown to the main root, lateral roots, and even fibrous roots, with each node swelling into tumors of varying sizes, causing the cherry tree to grow slowly or even stop growing, and the whole tree dies within 3 to 5 years
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What are the control methods for cherry root cancer?
How to control cherry root cancer? The tumor at the root crown of cherry is caused by a bacterium of the genus Agrobacterium, known as cherry root cancer. The most obvious symptom of this disease is the formation of spherical or hemispherical tumors at the root crown. In the early stage, the tumors are white and soft, then gradually enlarge and become lignified. The surface of the diseased tumors is rough, brown or dark brown. Cherry root cancer often causes poor growth of the aboveground part of the plant, yellowing of leaves, and in severe cases, plant death. The pathogenic bacteria of cherry root cancer survive and overwinter in the surface layer of the tumors of diseased plants and in the soil. When the surface layer of the tumors is decomposed
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Control Methods for Spider Mite Damage on Cherry Blossoms
How to control the damage caused by spider mites to cherry blossoms? The spider mites that harm cherry blossoms are mostly hawthorn spider mites, also known as hawthorn red spider mites. Spider mites mainly damage cherry blossom leaves. In early spring, the adults and nymphs gather on the undersides of leaves, piercing their mouthparts into the leaf tissue to suck sap, causing the damaged leaves to show chlorotic spots; in severe cases, the leaves scorch and drop early. The female adult of the hawthorn spider mite is 0.5 mm long, oval in shape, with a total of 26 setae on its back. The body is red, with winter and summer forms: the winter form is bright red with a silky sheen; the summer form is red when molting, and after feeding
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How to deal with root nodule disease in cherry blossoms? Detailed explanation of prevention and control methods
Last spring, when planting cherry blossom seedlings, the author found that the roots of some plants had nodular growths. Their symptoms were varied in shape and size, brown to dark brown in color, with rough surfaces, and some showed cracked patterns. The affected areas were on the ground or near the root crown at ground level, and at the graft union between the rootstock and the scion. Affected plants showed poor growth and stunting. After identification and diagnosis, the author believes this is root nodule cancer disease, and the seedlings should be treated before planting. The methods are: 1. For suspicious seedlings, soak the roots in a 1% copper sulfate solution for 5 minutes,
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What to Do About Slug Moth Caterpillars Harming Cherry Blossoms? A Detailed Guide to Prevention and Control Methods
What harm do slug moth caterpillars do to cherry blossoms? How can they be controlled? Slug moth caterpillars mainly cause damage by their larvae chewing on cherry blossom leaves. Newly hatched larvae gather in groups to gnaw the leaf flesh, leaving the epidermis behind; after growing larger they disperse and cause damage, and in severe cases they can eat all the leaves on an entire branch. There are many species of slug moths that harm cherry blossoms, including the brown-edged green slug moth, the Chinese green slug moth, the camphor slug moth, and the small black slug moth. Adult slug moths are mostly densely covered with scales and hairs, generally yellow-brown to green, with simple red or brown markings. Their larvae are commonly known as stinging caterpillars, with branched spines and venomous hairs on their bodies that can irritate
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How to control mushroom size? Here are the key methods
In the sale of button mushrooms, buyers are very strict about the requirements for fresh mushrooms (requiring a diameter of 2-4 cm), which directly affects the production efficiency of mushroom growers. The techniques for how to control mushroom size are introduced below. 1. Replace the strain. The mushroom variety now commonly used is the "As2796" strain, which is a large-sized hybrid. Its main advantages are wide adaptability, strong stress resistance, large size, and high yield, making it suitable for fresh market sales, but relatively few meet the buyers' purchasing specifications. If there is a supply order, promptly
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How to control mushroom fungus gnats? Detailed control methods
There are many species of maggot-like larvae that damage mushroom fruiting bodies and mycelium, collectively known as "fungus gnats." There are 4 more common species, namely mushroom gnats, gall midges, mushroom flies, and dung flies. Their larvae - maggots - look similar in morphology to the naked eye, and among the adults only gnats and flies show obvious differences. The morphology and even living habits of gall midges, mushroom flies, and dung flies are very similar, so they are often mistaken for a single species, all called "mushroom flies." Fungus gnat larvae bore into and feed on fruiting bodies, turning mushrooms into waste products, and some harm the mycelium. Mushrooms that have been bored and fed on by fungus gnats
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