-
A Detailed Guide to Common Lily Diseases and Their Control Methods
1. Bulb and scale rot and stem diseases caused by Fusarium. Symptoms: In plants with bulb and scale rot, growth is very slow and the leaves are pale green. Underground, brown spots appear at the top of the scales, on the sides, or where the scales join the basal plate, and these spots gradually begin to rot. If the basal plate stem is infected, the entire bulb will rot. The stem and leaf diseases caused by Fusarium are diseases that infect the above-ground parts. The identifying sign is that the basal leaves turn yellow before reaching maturity, and the yellowed leaves turn brown and drop off. On the stem
-
How to prevent and control common lily diseases? Detailed prevention and control methods
1. Soft rot. It harms the bulbs, causing them to rot and giving off a foul, offensive odor. It occurs severely when the temperature is high and humidity is great, causing rampant damage and spreading rapidly. Before planting, select undamaged bulbs and soak them in a 0.1% potassium permanganate aqueous solution for 8-10 minutes to disinfect them. After the disease occurs in the field, use a 5000-fold agricultural streptomycin aqueous solution, or a 5000-fold streptomycin sulfate aqueous solution, or a 5000-fold new phytomycin aqueous solution to drench the roots and spray the leaves, once every 7-10 days, for 2-3 consecutive times, pouring 2-3 kg
-
Detailed Guide to Impatiens Growing Methods and Care Techniques
Impatiens, also known as henna, is an annual flower native to southern China and the tropical plains of Asia. It has many varieties and rich flower colors, including red, pink, purple, yellow and white, as well as bicolor forms, and is very showy. It is generally divided into two major groups, single-petaled and double-petaled. Single-petaled plants are conical, tall and sturdy, and can reach up to 80 cm. The flowering order rises section by section from the lower part upward, and the flowering period can last up to 1 month. Double-petaled varieties are shorter, generally less than 40 cm, with a flat-topped form; at flowering, the area near the terminal bud is all flower buds, and the flowers open neatly all at once from the top to the lower part,
-
Symptoms and Control Methods of Downy Mildew on Impatiens
The scientific name of downy mildew on Impatiens is Plasmopara obducens (Schrtiter) Schroter, and it causes damage worldwide. It mainly affects the leaves and reduces their ornamental value. Symptoms: On affected leaves, chlorotic patches initially appear, irregular in shape, later turning into yellow-brown or brown necrotic spots; on the underside of the leaves there is a white mold-like growth, relatively thick and dense, and in severe cases it can cover the entire leaf, causing the leaves to scorch and affecting their ornamental value. The pathogen is called Impatiens axis downy mildew, belonging to the oomycetes. 2-5 sporangiophores emerge from the stomata,
-
What are the control methods for primrose brown spot disease?
Symptoms are prone to occur on the fairy primrose (Primula malacoides). Brown spots form on the leaves. The pathogen Alternaria sp. belongs to the deuteromycete Alternaria fungi. Transmission route: conidia are spread by wind and rain. Control method: spray fungicides such as 70% chlorothalonil wettable powder at 1000 times dilution in the early stages of the disease.
-
Symptoms and Control Methods of Botrytis Blight in Primroses
Botrytis blight is a common and widespread disease of primroses. [Pathogen] Botrytis cinerea Pers. et Fr. [Symptoms] Water-soaked spots appear at leaf tips or leaf margins, then gradually enlarge, turn brown to black, and rot; stems develop irregular brown lesions and are prone to soft rot; flowers turn brown, rot, and drop off. In the late stage of the disease, a grayish-brown mold layer forms on the affected parts. [Disease cycle] The pathogen overwinters in diseased plant residues or in the soil. Conidia are spread by wind and rain
-
What are the control methods for leaf spot disease in primroses?
Control of leaf spot disease in primroses: 1. Select and breed disease-resistant varieties. 2. Strengthen fertilizer and water management, apply more organic fertilizer and phosphorus-potassium fertilizer, and avoid over-applying or applying excessive nitrogen fertilizer alone. 3. After the disease first appears at the seedling stage, begin spraying 70% thiophanate-methyl wettable powder at 1000 times dilution plus 75% chlorothalonil wettable powder at 1000 times dilution, or 50% sulfur mixture suspension or 36% thiophanate-methyl suspension at 500 to 600 times dilution, or 1:1:100 Bordeaux mixture.
-
What are the control methods for primrose leaf spot disease?
Symptoms The disease occurs on the leaves. The spots are usually 3-4 mm in diameter and brown; in severe cases, the diseased leaves wither and die, causing defoliation. The disease spreads from the lower leaves to the upper leaves. The pathogen is Ramularia primulae Thumen, the primrose Ramularia fungus. It belongs to the Deuteromycotina fungi. The conidiophores emerge from the stomata, growing in clusters of several branches, very short, unbranched, colorless, with slightly curved tips; the conidia are cylindrical or short club-shaped, single-celled or two-celled, colorless, measuring 16-24 x 3-4 micrometers. Transmission routes and conditions for disease development
-
Symptoms and Control Methods of Primula Leaf Spot Disease
Symptoms: It mainly affects the leaves of the plant. The disease spreads from the lower part of the plant to the upper part. The spots are usually 3 to 4 mm in diameter and brown; in severe cases, the diseased leaves wither and die, causing defoliation (see Figure 2). The disease is caused by Ramularia primulae. The pathogen overwinters as mycelium or conidiomata on diseased plant debris, and seeds can also carry the pathogen, becoming the primary infection source for the following year. The disease mainly spreads through conidia carried by air and rainwater. Reinfection is frequent during the growing season. Plants are usually prone to the disease in warm, humid weather and when nitrogen fertilizer is applied excessively.
-
How to prevent and control southern blight in lilies? A full analysis of the key methods
Symptoms: The whole plant wilts, white mycelial strands or rapeseed-like tan-colored small sclerotia wrap around the stem base, and the affected part turns brown and rots. Large amounts of white mycelial strands and tan-colored sclerotia are visible on the soil surface. Pathogen: Sclerotium rolfsii Sacc., called the sclerotium-forming fungus, belongs to the Deuteromycotina fungi. The hyphae are white and silky, spreading in a fan-like or radial pattern, then gathering into mycelial strands or tangling into sclerotia. The sclerotia resemble rapeseeds, initially white to yellowish-white, later turning tan, round, with a smooth surface. Transmission routes: (1) The pathogen
条件筛选