Main diseases of woody flowers and their control methods

Tree and flower diseases and insect pests have always been a hindrance to the healthy growth of plants and have perplexed the vast number of greening workers. How to find and control diseases and insect pests is related to the overall situation of the greening cause. Now the main diseases and control methods of trees and flowers are listed for reference by the majority of greening workers.

Powdery mildew

Targets: rose, Rose, Rosa, Fengxianhua, Rose Chrysanthemum, Poplar, Willow, Robinia pseudoacacia, Quercus, Rose, Dahlia, Chestnut, Walnut, Paulownia, Mulberry, Pu, Toona sinensis, Apple, Pear, Peach, clove

Damage condition: damage leaves, branches, flower stalks flower buds grow a layer of white powder, leaves curl, branch deformity, serious flowers are few and small, or even death.

Prevention and control methods:

1. Before sprouting in early spring, thoroughly cut off the diseased branches and leaves, burn them centrally, and spray 3Mel 4-degree lime-sulfur mixture.

2. Spray 50% Dailin ammonium or 70% topiramine 800 Mel 1000 times, or 25% carbendazim 500 Mel 800 times during the growth period.

Black spot disease

Damage targets: rose, Rose, Rosa davidiana, Rosa davidiana, Populus tomentosa, Walnut, paulownia

Damage condition: mainly harmful leaves, purple-dark brown or brown round spots or irregular wheel spots grow on the leaves, causing the leaves to fall off.

Prevention and control methods:

L, remove the dead branches and leaves in time and burn them centrally.

2. According to the condition, you can spray 100ml 160 times Bordeaux solution, 70% topiramate or 50% carbendazim 500m 800 times.

Rust disease

Targets: rose, hemerocallis, chrysanthemum, spruce, larch, Masson pine, Yunnan pine, black pine, Pinus tabulaeformis, Chinese white poplar, jujube.

Damage status: damage to leaves, stems, flower stems and buds, resulting in orange-yellow summer spores and black winter spores.

Prevention and control methods:

1. Find the diseased plant and remove it in time.

2. Chemical protection during the growth period, spray 65% Dyson zinc 500 Mel 600 times or 97% rust sodium 250 Mel 300 times (plus 0.1 Mel 0.2% washing powder).

Grey mold disease

Victims: peony, cyclamen, chrysanthemum, peony, grape, poplar, willow

Damage condition: damage to leaves, stems and flowers, purple brown or brown disease spots, gray mold disease, soft rot on stems, causing plants to collapse.

Prevention and control methods:

1. Pay attention to ventilation and light transmission, cut off diseased branches and leaves in time, and concentrate on burning.

2. Medicament protection, spray 120ml 160 times equivalent Bordeaux wave or Dyson gong 800Rue 1000 times.

Brown spot disease

Targets: elm plum, chrysanthemum, Begonia, pyrethrum, poplar, Elaeagnus angustifolia

Damage condition: there are brown or dark brown round disease spots on the injured leaves, and the leaves gradually turn black and wither.

Prevention and control methods:

L, winter and spring completely eliminate diseased leaves and branches and burn them.

2. Spray 160 times Bordeaux wave or 600 times Dyson zinc solution during the growth period.

Pine seedling leaf blight

Victims: Masson pine, black pine, slash pine, Caribbean pine

Damage condition: the needles in the lower part of the seedling were damaged first, then spread upward gradually, and macula appeared on the leaf surface first, followed by black mildew spots.

Prevention and control methods:

1. The seedlings should not be too dense.

2. Spray fungicides such as 500-fold acetaminophen or 700-fold hexachlorobenzene.

Anthrax

Target: orchid, cactus, hydrangea, magnolia, cyclamen, Chinese fir, Camellia oleifera, paulownia, apple, begonia, peach, pear, cherry, Hawthorn, persimmon.

Damage status: damage leaves, stems, grow nearly round purple-brown or light brown disease spots, there are black spots on them, when the leaves withered seriously.

Prevention and control methods:

1. Diseased plants are found and cut off in time.

2. Pay attention to ventilation and light transmission, and strictly control soil moisture.

3. At the initial stage of the disease, 50% carbendazim or more or 70% topiramate 500 Mel 600 times can be sprayed.

Leaf mildew

Victims: peony and peony

Damage status: damage leaves, stems, disease spots nearly round, purple-brown, showing obvious concentric patterns, wet, brown mildew on the back of the leaves, serious, resulting in a large number of scorched leaves.

Prevention and control methods:

L, remove diseased leaves and branches in time and reduce the source of disease.

2. Pay attention to waterlogging and cold prevention.

3. Spray 160 times Bordeaux solution or 65% Dyson zinc 500 times solution.

Nematode disease

Targets: cyclamen, chrysanthemum, rose, dahlia, impatiens, ginkgo.

Damage status: a kind of harmful leaves, light green leaves. There are yellowish to brown spots on the top, the leaves gradually wither, and when serious, the flowers are small or deformed, or even wither without flowering; the other kind harms the roots, forming insects thin, causing the roots to rot, the damaged plants grow weak, and the leaves yellow or even wither.

Prevention and control methods:

L, soil disinfection: seedling bed with DDT 23 Mel 30ml / kg or 80% dibromochloropropane 5Mel 8mm / min.

2. Find the disease sign, remove it thoroughly, burn it, and disinfect the soil.

Viral disease

Targets: Dahlia, Baitai, peony, orchid, chrysanthemum, rose, daffodil

Damage condition: the injured plants showed symptoms such as abnormal mosaic, clump, dwarfing, spots, atrophy and so on.

Prevention and control methods:

L. Strengthen quarantine work.

2. Remove the diseased plant and burn it in time.

3. Timely control of diseased insects (such as aphids, leafhoppers, whitefly, etc.).

Cataplexy

Damage targets: pine, fir, larch, Tilia, Toona sinensis, Schima superba, Robinia pseudoacacia, maple poplar, elm.

Damage status: diseases and insect pests occurred on unlignified seedlings and suffered the most before and after they were unearthed. A large number of injured seedlings lodged and died.

Prevention and control methods:

1. Disinfect the seeds and soil.

2. Reduce the amount of irrigation at seedling stage and avoid getting too wet.

Root rot disease

Target: walnut, chestnut, goose palm, pine, poplar.

Damage status: after the Lignification of the seedlings, the roots become black and moldy by bacteria, the leaves turn brown, and the whole plant dies when it is serious.

Prevention and control methods:

1. Disinfect the seeds and soil.

2. Reduce the amount of irrigation at the seedling stage to avoid excessive soil moisture.

Blight disease

Targets: orchid, carnation, chrysanthemum, begonia, iris, Korean pine, larch, Pinus sylvestris var. mongolica, Pinus tabulaeformis, Pinus tabulaeformis, Sequoia koraiensis.

Damage condition: damage to the stem base and root of the seedling, the damaged part showed brown or reddish brown constriction, withered or root rot.

Prevention and control methods:

1, soil disinfection: formalin, 50 milliliters per square meter, add water 16 murals 24 jin.

2. Remove the diseased plant in time and spray 300 Mel 500 times of Dysenamine to prevent it from spreading.

Stem rot

Targets: ginkgo biloba, Eucommia ulmoides, pine, cypress, Torreya grandis, metasequoia, Cryptomeria fortunei, maple incense, Robinia pseudoacacia, chestnut, mulberry, cypress, maple.

Damage condition: the root neck of the injured seedlings turned brown, the cortex shrank in the later stage, the endodermis became spongy, and the seedlings dried up and died.

Prevention and treatment: summer seedlings shade to prevent sunburn.

White silk disease

Targets: Camellia oleifera, Eucalyptus, Nan, Qingtong, Catalpa, Masson Pine, Citrus, Apple

Damage condition: the stem base and root epidermis of the injured seedlings rotted, the leaves showed wilting symptoms, and there were white hyphae, and finally the whole plant withered.

Prevention and control methods:

1. Remove the diseased seedlings in time and burn them; disinfect the diseased soil with lime.

2. Slightly damaged seedlings can be irrigated through the root and neck with 0.1 per cent of mercury water, so as to avoid stagnant water in the seedling bed.

Nodule nematode disease

Damage targets: Poplar, Robinia pseudoacacia, sample, willow, walnut, Xinguan fruit, paulownia, park, elm, maple, camphor, jujube

Damage condition: the root of the diseased seedling has a soft round tumor with a size of 0.5mi 2cm, and there are white granules cut open, that is, nematodes.

Prevention and control methods:

1. Disinfect the soil with methyl bromide.

2. Rotation should be carried out in the nursery, not continuous cropping.

3. Remove the germs and burn them in time.

Poplar canker

Damage targets: Populus tomentosa, Populus tomentosa

Damage status: diseased plants or bacteria appeared disease spots, concentrated in the middle and lower part of the stem, bark turned brown, slightly sunken, showing bean-sized vesicles in autumn.

Prevention and control methods:

L. Get rid of germs and burn them.

2. Dig out the disease spot and apply 0.1% liter of mercury and other agents.

Bacterial soft rot

Targets: Iris, cyclamen, calla lilies, hyacinth, cassia bamboo incense

Damage: damage to rhizomes, bulbs, bulbs, tubers and other reproductive organs, under dry conditions, the injured organs are powdered chaff, in the case of high humidity, a soft shell wrapped in rotten pulp, serious, the plant dies.

Prevention and control methods:

1. Storage and disinfection: use 80 times formalin and pay attention to ventilation at the same time.

2. Strict selection of seedlings, disinfection of diseased block materials, and use of domestic streptomycin 350 Mel 700 units / mm.

3. The diseased leaves should be cut off in time, and the utensils should be disinfected with 75% alcohol or 0.1% potassium permanganate.