Water lily garden management and pest control
Water lily garden management The water lily is a long-day plant. The planting site should have sufficient light and ventilation. Water lilies also have certain requirements for the water level in different stages of growth. Potted plants are placed in the open air, shallow water in the early stage and full of water during the prosperous period. The pots were submerged and the initial water had not passed the edge of the basin; with the growth of the leaves, the water level was gradually increased. The surface of the water was about 20 to 30 cm from the basin; during the prosperous period, the surface of the water was 30 to 50 cm from the basin. The pond is planted with water lilies and enters the rainy season. When the water depth exceeds 1 meter, it should be drained in time. When the potted water lily grows in the early stage, the base fertilizer is sufficient, and it is not necessary to top-dress. The flowering stage is to promote flower bud differentiation, and quick-acting potassium dihydrogen phosphate should be chased (using absorbent paper, wrap fertilizer, a pack of 5 grams, 2 bags per cylinder, can be wrapped Several small holes. Inserted under the basal wall into the rhizomes, once every half a month, applied 3 to 4 times.) As long as the pond has a fertile silt layer at the bottom of the pool, it is not necessary to top-dress. Pay attention to removing weeds, dead leaves and algae in the basin. Excessive algae can be sprayed with 0.3% to 0.5% copper sulphate solution, half a month, several times in a row, can play a certain role in control. Winter protection, potted plants can be cellaring. Cold-tolerant species, the temperature in the pits is 0 to 5°C; in the tropical varieties, the pitting temperature should be maintained at 10 to 15°C and can be free from freezing damage. In the pond planting, cold-tolerant species can overwinter under the ice at the bottom of the pool; tropical species can be used to grow the bulbs in the north, and in the greenhouse at 10 to 15°C, they can be preserved by sand stratigraphy until they are planted in the following year.
Water lily main diseases
1. Black spot mainly damages the leaves. At the beginning of the disease, yellowish chlorotic lesions appear on the leaves, round or irregularly shaped at the late stage, brownish and rimmed, with sometimes yellow-green halos on the edges, and onychomycosis layers, with a diameter of 5 to 15 mm. In severe cases, the lesions were even in pieces, with the exception of leaf veins, the whole leaves were yellow. The disease is caused by fungi. During the rainy season, when the rainy season occurs seriously, the lotus ponds or pots are used continuously, and under conditions where nitrogen fertilizer is applied excessively or the water temperature is too high in summer, the diseases are very serious. Prevention methods: Strengthen cultivation management and remove diseased leaves in time. Plants with more severe disease need to be replaced with new soil and planted again without nitrogenous fertilizer. At the time of onset, 75% of chlorothalonil can be sprayed 600 to 800 times to control. 2. Brown spot damage Lotus leaves. A round spot of 0.5 to 8 mm in diameter appeared on the diseased leaf, showing a light brown to yellowish brown color with a darker edge. At the late stage of the disease, many black mold spots were produced on the lesions. It is more severe in the autumn and rainy season. Many pathogens overwinter overwhelming prevention and control methods: removal of residual leaves, reduce the source of the disease. Severe attack can be sprayed with 50% of carbendazim 500 times or 80% of dexamethasone 500 to 800 times for control.
The measures for early flowering of water lilies to maintain the water lilies before the "61" flowering can be used in the late March to early April with the ramets method of raising seedlings. The rhizome of the new branch was planted in a pot, and the time for planting should not be later than 50 to 60 days before the date of flowering. The cultivation substrate should maintain a water layer of 10 to 20 centimeters high. Under this condition, the water lilies grew very quickly. Fertilizer supply must be ensured. Except when suitable amount of base fertilizer can be applied during planting, it is best to insert rod-shaped organic fertilizer as top dressing every 10 days in the growth medium. The water lilies are aquatic plants. After the flowers are opened, the water management is the same as before flowering. It is best to top-dress often, otherwise prone to dumb buds. Be careful not to put it in a shaded place, as water lilies can bloom normally when the sunlight is sufficient. In addition, pay attention to the temperature of the environment should not be too low, so as not to inhibit the flowering of plants.
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