Bud blight of hydrangea macrophylla
Botrytis cinerea is also called Botrytis cinerea. Harm the buds and flowers of the plant.
Symptoms: plants cultivated in the open field tend to occur in dense clusters of spherical flowers, causing them to rot in the form of water stains. When cultivated in greenhouse, buds are easy to blacken and wither.
Pathogen: the pathogen is Botrytis cinerea (BotrytiscinereaPers.), which belongs to the subphylum Trichospora, Trichospora, Trichoderma and Botrytis.
The regularity of the disease: the pathogen overwintered with mycelium in the disease residue. Conidia were produced in the spring of the following year, and the conidia spread and infected the plant by wind and rain. Conidia can repeatedly infect the host during the growing season. Under warm and humid conditions, the disease occurs seriously.
Prevention and treatment: (1) reduce the source of infection: thoroughly remove the disabled body and destroy it centrally. (2) Chemical control: at the initial stage of the disease, 70% topazine wettable powder was sprayed 1000 times, or 50% benzoate 800-1000 times, every 10-15 days, 2-3 times. During the storage period in greenhouse, 50% carbendazim wettable powder can be sprayed 8-1000 times, or 50% benzoate 1000 times.
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Maintenance and management of eight immortal flowers
Fertilization: eight immortal flowers like fertilizer, generally every half a month to pursue organic fertilizer. There is more nitrogen fertilizer in the early growth stage, and more phosphorus and potassium fertilizer in the flower bud differentiation and bud formation stage. 0.1% to 0.2% potassium dihydrogen phosphate can also be sprayed on the leaves for 2 to 3 times, and the fertilization can be stopped after the flower buds are transparent. Watering: the transpiration of the leaves of the eight Immortals is very large, so it must be watered in time, even if the lack of water for a short time wilts, it can also cause the leaf margin to dry up and the flowers to die. Especially in summer, it is necessary to shade and cool down to reduce transpiration and maintain more than 60% air humidity. In addition, eight
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Morphological characteristics of eight Immortals
Deciduous shrubs, 3m tall; branchlets smooth, old branches stout, with large leaf traces and lenticels. The leaves of the eight Immortals are large and opposite, light green, glossy, oval or Obovate, margin obtusely serrated. Inflorescences large, terminal, corymbose, globose, pedunculate. Each cluster of flowers is flattened with fertile bisexual flowers in the center; the outer margin is sterile flowers, each with four enlarged sepals, petal-shaped. The eight Immortals begin to bloom bluish white, gradually turn pink, and then turn purplish red, with beautiful colors. eight
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