Common diseases and insect pests of Chinese rose and their control methods

Rose flowers are beautiful, varied and fragrant, and the four seasons are often blooming, especially a wide variety of varieties, easy to breed and cultivate, known as the "queen of flowers", is one of the top ten famous flowers in China, but rose diseases and insect pests often cause poor growth, or even death, seriously affecting the ornamental value, let's take a look at the common rose pest control methods!

Rose powdery mildew

[symptoms] chlorotic macula appeared at the initial stage of the diseased leaves, then enlarged and covered with raw white powder, reverse curling, wrinkling, thickening, slightly inflated petiole and tender shoots after infection, reverse bending, and flower posture deformity after bud infection. In severe cases, the leaves are withered and yellow and the plants are weak.

[occurrence regularity] the pathogen overwinters on buds, leaves and branches and spreads by the wind. The optimum onset temperature was 17-25 ℃, and the peak period was from May to June and from September to October. The disease is easy to occur when there is too much nitrogen fertilizer or too little potassium fertilizer in the soil.

[prevention method] resistant varieties were selected for ①. ② fertilize reasonably and avoid nitrogen fertilizer. ③ clears and burns diseased leaves in early spring. ④ was moderately pruned to keep the plant ventilated and transparent. Spraying triamcinolone acetonide and Baiyuqing before and after the onset of ⑤.

Rose black spot

[symptoms] Rose leaves, pedicels and twigs can all suffer from brown seeds to brown spots at the initial stage, then expand and become black or dark brown, often surrounded by yellow halos, and in severe cases, the middle and lower leaves of the whole plant all fall off, and the branches die.

[occurrence regularity] the pathogen overwintered in diseased branches and leaves or fallen leaves, spread by wind and rain, was the most serious after the end of summer, the disease of high temperature and drought spread slowly, and weak plants were easy to occur.

[control methods] the diseased leaves were removed in time by ①, and the diseased plants were heavily pruned in winter. ② is often pruned during the growing season to maintain good ventilation. ③ can be controlled by chlorothalonil, carbendazim, Dysen zinc, methyl topiramate and other agents.

Rose leaf blight

The symptoms occurred in the leaves of rose, the yellow-green needle spots appeared on the leaves at the initial stage, and the lesions expanded in round or irregular shape at the later stage, with purple edges, continuous patches after expansion, obvious disease key boundaries, small black spots in the later stage, and burning edges of the diseased leaves.

[occurrence regularity] the pathogen overwintered in diseased leaves or soil and spread old leaves, weak branches, rainy seasons and extensive management.

[prevention and treatment methods] ① cleared and destroyed the diseased leaves in time. ② selected disease-resistant varieties, reasonable close planting, and strengthened maintenance. ③ was sprayed with 3-degree stone-sulfur mixture in dormancy season. Spraying chlorothalonil and other agents before the onset of ④. In the early stage of ⑤, carbendazim and other agents were sprayed for prevention and treatment.

Rose root cancer

[symptoms] nodules of different sizes and shapes appeared in the roots and stems of the rose, with poor plant growth, short branches and leaves, withered yellow leaves, early fall, small or non-flowering flowers.

[occurrence regularity] germs survive in the soil and spread by water and tools. At the beginning, the tumor is small and soft, white, and then gradually increases, turning dark brown, rough and cracked on the surface, hard and Lignification.

[prevention and control methods] planting in the open field should not be repeated as far as possible, improve the level of grafting, change the method of grafting, reduce the wound and avoid infection.

Rose mosaic disease

The main symptoms are flowers and leaves, some with annular spots or oak leaf patterns, and some with chlorotic spots, yellow veins or dwarfing.

[occurrence regularity] viral diseases, diseased plants as breeding materials, juice contact and piercing pests can spread. Strong light and drought in summer are beneficial to the development and expansion of disease.

[control methods] ① avoids using diseased plants as breeding materials. ② found that the diseased plants were removed and destroyed in time. Disease-resistant varieties or tissue culture seedlings were selected for ③. Attention should be paid to the control of aphids and other transmission media in the growing season of ④. In the early stage of ⑤, aminooligosaccharides were sprayed to inhibit the spread of the virus.

Rose flower rot

[symptoms] occur on the rose and pedicels, the initial disease spot is in the base of the outer petals, the small fluffy brown spot expands, and then the flower is covered by brown disease spot, until the yellowish brown dries up and black particles appear.

[occurrence regularity] the pathogen overwintered on the remnant of the diseased plant, spread with wind and rain, and was easy to occur when the growth was weak and the humidity was high.

[control methods] resistant varieties were selected for ① to keep ventilated and transparent. ② spraying stone sulfur mixture, carbendazim, carbendazim and other medicament control.

Orange thorn whitefly of rose

[occurrence regularity] there were four generations a year, which reached the peak in late May, late July, late August and late September to early October, respectively. the mature larvae overwintered on the back of the leaves, resulting in leaf yellowing.

[control methods] ① cleared the weeds and eliminated the overwintering adults in winter. During the occurrence of ②, trichlorfon, omethoate, dichlorvos and fenitrothasone were used to control the disease.

Rose aphid

[occurrence regularity] 10-30 generations a year, overwintering with eggs in shoots, bud axils and bark cracks, the damage began in the middle of March, and the damage was the most serious in April and May.

[control methods] ① combined with winter pruning to cut off the branches with eggs. ② used yellow viscose board to induce winged aphids. ③ can be sprayed with imidacloprid and other insecticides during the initial incubation period and before spawning. ③ can be sprayed with imidacloprid and other insecticides during the initial incubation period and before spawning.

Chinese rose scale insect

[occurrence regularity] there are 1-4 generations a year, and the female overwinters in the wax shell and can be parasitized on the branches and leaves, resulting in weak tree potential, poor growth and serious death of the whole plant. The occurrence of high canopy density and poor ventilation and light transmission is serious.

[control method] ① artificially scraped off the insect body and wax shell on the dry branch. ② strengthen management, proper pruning, increase ventilation transmittance, reduce the probability of occurrence. ③ was destroyed even if the insect branches were cut off. ④ sprays Huabao, imidacloprid, scale mites and other chemicals to control nymphs during the initial incubation period. The furrow ring around the root of ⑤ was treated with carbofuran and other internal inhalation agents.

Chinese rose yellow chest thrips

[occurrence regularity] about 10 generations a year, adults and nymphs are hidden in flowers, and eggs are half-buried under the epidermis of petals and stamens. Eating habits, high temperature and drought are conducive to the occurrence, rainy and strong wind are not conducive to the occurrence of this insect.

[control method] ① cleared the dead branches and weeds in the pest field and burned them on the spot. ② spraying imidacloprid and other insecticides for control. ③ buried with carbofuran, Tiemiake granules and other medicament control.

The common diseases and insect pests of flowers in spring and their control methods the temperature in spring is suddenly warm and cold, how to prevent the diseases and insect pests that harm flowers from April to May, the following is the flower protection net and their own practical experience, there are the following kinds of diseases and insect pests that harm flowers in this period. I hope it will be helpful to the friends who grow flowers. Common diseases and insect pests of flowers in spring and their control methods aphids hibiscus, green peach, rose and honeysuckle are easily harmed by aphids. With the rise of temperature, aphids are also increasing. Prevention and treatment: imidacloprid and acetamiprid are sprayed, and a very small amount of washing powder can be added to enhance the efficacy. Common diseases and insect pests of flowers and plants in spring and their control methods Red Spider has been harmful to jasmine, asparagus, rose, Dahlia and so on since the first ten days of April. Prevention and control methods: the use of acarine, avermectin for prevention and control. Common diseases and insect pests of flowers and plants in spring and their control methods most of the shell insects on Magnolia Magnolia, rose, yellow poplar and crape myrtle began to hatch from mid-April to mid-May. Prevention and control methods: 1. Brush off the insect body manually before hatching. 2. Spraying chlorpyrifos and cyhalothrin during the larval incubation period. Common diseases and insect pests of flowers in spring and their control methods when the temperature reaches 20 ℃, newly sown flowers, seedlings and some flowers with rotten roots are very easy to develop blight when the soil moisture is high. Control methods: 1. Use the special seed coating agent for flowers to mix seeds before sowing. 2. Control watering at the seedling stage so as not to make the soil too wet. 3. At the beginning of the disease, irrigate 1% ferrous sulfate or spray mancozeb. Common diseases and insect pests of flowers in spring and their control methods Rust Rust infects roses when they are budding. Prevention and control methods: 1. When the rose sprouts, the first yellow bud should be removed and burned in time to eliminate the source of infectious disease. 2. Spray 15% triadimefon 700Mel 1000 times solution in the initial invasion period. Common diseases and insect pests of flowers in spring and their control methods powdery mildew of rose and impatiens mostly occurred from May to June, and it was easy to cause yellow leaves, withered leaves, twisted shoots and other symptoms in early summer. Prevention and control methods: 1. Pay attention to the ventilation and light transmission of flowers. 2. Apply less nitrogen fertilizer and more phosphorus and potassium fertilizer. 3. Spray 15% strychnine at the first dyeing stage with 700Mel 1000 times solution. Prevention and control of common diseases and insect pests of Chinese rose flowers many flower lovers who raise rose flowers are most worried about the diseases and insect pests of Chinese rose flowers in the process of culture. the following is to talk about the prevention methods of common diseases and insect pests in combination with their experience. 1. Green worms: Bacillus thuringiensis, a biological bacterium that is non-toxic to humans, has a good effect on insects and borer (borer), and can be used in fruit trees and vegetables. 2. Red spider: daben or triclofenac, avermectin and triazotin can be used. I saw that flower friends use Avidaben before, but this one only kills bugs but not eggs, and it will appear again two or three days later, so go on, wait until there is no end, and suggest initial and preventive use. 3. Aphids: rose flowers will have green aphids in early spring, so it is recommended to use imidacloprid, which can be done at one time. 4. Powdery mildew: prevention at ordinary times: blue powder (mancozeb), chlorothalonil, methyl Tobu, carbendazim. Treatment: blue powder + multicolor cyanobacteria frustration or has been thwarted benzoate + blue powder or pentotol + polychromatic cyanobacteria frustration or diazepam + blue powder. 5. Black spot: use Dupan Fuxing or configure Bordeaux liquid yourself, that is, use copper sulfate with quicklime. 6. Thrips: imidacloprid plus dimethoate is recommended. Finally, we recommend some essential drugs and optional drugs. Essential drugs: imidacloprid, Avidaben, Bacillus thuringiensis, Blue Powder, Cyanobacterium, DuPont Fuxing. Available drugs: methyl Tobuterium, Chlorothalonil, carbendazim, has been fouling mildew. Conclusion: the above are the prevention and control methods of common diseases and insect pests in the process of rose cultivation. I hope it will be helpful to the friends who plant Chinese rose.