Control techniques of Leaf Blight of Rhododendron
First, the main symptoms: occur in the leaves, mostly in the tip of the leaves. In the initial stage, the disease spot is faded green macula, the disease spot spreads inward from the edge, showing an irregular shape; in the later stage, the disease spot is yellowish brown, and when the disease leaf is serious, the disease leaf is dry.
Second, the cause of the disease: fungal diseases. The pathogen lives on the plant disease residue and spreads through watering, insects and human activities. It can occur all the year round in the indoor environment. High temperature, dryness and poor ventilation are easy to cause diseases. The disease is serious after plant growth is weak or suffered by insect pests (especially aphids, shell insects, whitefly).
Third, prevention and control methods: ⑴ timely removal of sick and residual fallen leaves, should not be stored in the basin, should be concentrated burned. ⑵ strengthens maintenance and often sprays water on the leaf surface or surrounding space to improve the small environment. Increase the application of phosphorus and potassium fertilizer to enhance plant growth potential. In the early stage of ⑶, carbendazim or topiramate was sprayed. If there are pests, you can spray 1000-1500 times the liquid of nicotine to control.
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How should azaleas be fertilized?
Rhododendron is a kind of flower that does not need big fertilizer. If the fertilizer is applied too much or too thick, it will be harmful to its growth. But this does not mean that it should not be fertilized, but that it should bloom more and more, and that the sky should apply some fertilizer at the right time and in the right amount. Therefore, flower growers summed up eight words of experience in fertilization: "less dry fertilizer, less liquid fertilizer". This is very appropriate and worthy of reference by florists. In general, 1. 2-year-old seedlings do not need to apply fertilizer, because the fertility contained in humus soil is enough to meet the needs of seedling growth and development. two
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Disease knowledge of Leaf spot of Rhododendron
Round spot, or irregular polygonal spot, dark brown, 1mm-5mm in diameter. In the later stage, the central tissue of the lesion turned gray. When the disease is serious, the disease spots are connected to each other, resulting in withered and yellow leaves and early fall. Under the moist environment, there are many brown mildew spots under the leaf spot, that is, the conidia and conidiophores of the pathogenic bacteria. Pathogen and disease status: Cercospora rhododendron CercosporarhocdodendriFer., half-known subphylum and filament
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