Prevention and treatment of spot disease of pelargonium
The main symptoms are damaging leaves, primary waterlogged spots, and then round, 2-3 mm in diameter, slightly sunken in the center, with a small brown center and a spreading edge around the yellow. The old spot can be up to 6-10 mm in diameter and is irregular, dark brown, with concentric lines and less light black mildew layer due to the limitation of leaf veins. Disease spots on the leaves can converge with each other for a long time, often making the leaves black, wrinkled and withered.
The condition of the disease mainly occurs in the older and weak tissue, so it is more common in the lower old lobe. Overcast rain and excessive watering are beneficial to the occurrence of diseases.
Pathogen AlternariapelargoniiEll.EtEv. It belongs to the fungal semi-knowing subphylum, Trichospora, Alternaria, Geranium Alternaria. Conidiophores solitary or fascicled, olive brown, tip light, basal cells dilated, unbranched, geniculate flexion 0-2, septum 2-8, 24-80 × 3-5 microns. Conidia solitary, olive brown, obclavate, beak slightly longer, light color, spore diaphragm 3-7, mediastinal membrane 0-2, septum constricted, 16-54 × 8-13 microns. The sick and disabled body carries bacteria. The spore production of the pathogen is small, and it is mainly transmitted by cuttings with disease.
The control methods can refer to the prevention and control of chrysanthemum black spot.
- Prev
How should geranium spot disease be prevented and treated?
Pelargonium spot disease control: a, small area planting, artificial removal of sick leaves, concentrated burning. 2. Improve the planting environment. Crop rotation shall be implemented in areas with serious disease, and planting density shall not be too dense to facilitate ventilation and light transmission, and accumulated water shall be removed in time. 3. During the disease period, spray 100 - 150 times of Bordeaux mixture or 500 times of 80% Diyindan wettable powder, or mix 50% thiophane methyl 1000 times and 80% Diyindan 500 times, or spray 45% chlorothalonil or polychlorothalonil.
- Next
Make the geranium blossom more
1. Too much watering or rain, long-term stagnant water in the basin, causing rotten roots, yellow leaves or plant growth, all affect flowering. two。 Excessive fertilization, especially too much nitrogen fertilizer, is easy to cause branches and leaves to grow, no flowering or rare flowering, poor flower quality. However, insufficient or non-fertilization will also affect the normal growth and flowering of plants. Therefore, more phosphorus and potassium fertilizer should be applied in early spring or early autumn. 3. The temperature is too high or low. Winter room temperature is more than 20C, coupled with poor ventilation, branches and leaves are easy to grow, affecting the flowering of the following year.
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