Disease control of water lilies

Water lilies can be cultivated as ornamental plants, but this kind of plants are prone to diseases and insect pests, so how to control them?

Disease control of water lilies

Water lily rot

Symptom manifestation

This kind of disease occurs in the whole plant and starts from the root. The underground stem is asymptomatic at the initial stage of the disease, but its cross section changes from light brown to brown and gradually expands. Some diseased stems do not change color significantly, but longitudinal wrinkles occur on the whole or one side of the stem, and the leaves from the diseased stems will show light green, and then begin to dry up from the leaf edge, causing the leaves to curl and die.

Prevention and cure method

Selecting disease-resistant varieties according to local conditions

Seriously ill fields should be rotated for 2-3 years.

Select disease-free lotus root, and use 50% carbendazim or methyl thiophanate wettable powder to deeply plough the lotus root field, apply lime 1500-2250kg per hectare to strengthen the management of fertilizer and water, apply sufficient rotten organic fertilizer, timely and appropriate amount of topdressing, achieve the combination of organic fertilizer and chemical fertilizer, combine nitrogen fertilizer with phosphorus and potassium fertilizer, spray 50% carbendazim wettable powder and 75% chlorothalonil wettable powder in time.

Nymphaea leaf rot

Symptom manifestation

The main harm to the leaves that stick to the water surface is that the symptoms of the disease spots are not stereotyped, some are shaped like "S", some are shaped like earthworms, brown or dark brown, white wrinkled globular mycelia appear in the later stage of necrotic part, and epigenetic tea brown globular sclerotia appear in the later stage of necrosis. the seriously affected leaves become brown and rotten, so it is difficult to draw out of the water.

Prevention and cure method

Reduce the source of bacteria, remove the diseased and residual plants during harvest, deeply bury or centrally spray 800 times of 50% carbendazim wettable powder at the initial stage of the disease, and spray every 10 days or so. Continuous prevention and treatment of water lily spot rot disease can show irregular shape, small black spots in the shape of primary water stains on leaves, and then expand into round to polygonal or irregular shape. The disease spot with yellow halo on the edge is black, and there are wheel lines in the middle. The disease part is easy to break or fall off, resulting in incomplete and irregular leaves and leaf edges. In serious cases, most of them even become black-brown rot, and the upper grayish-brown mildew layer, that is, the fungus fruiting body.

Prevention and cure method

Collect disease residues during the growing season, bury them or burn them.

Adequate application of mature organic fertilizer, timely and appropriate amount of topdressing, so as to achieve the combination of organic fertilizer and chemical fertilizer, nitrogen fertilizer and phosphorus and potassium fertilizer.

After removing the diseased plant in time, spray 50% carbendazim wettable powder 600 times, about 10 days as a cycle, spraying 2-3 times continuously.

Anthracnose of Nymphaea

Symptom manifestation

The disease occurred on the leaves with small brown spots, and then the spots expanded into near-round spots above 10mm, and the edge of the spot was darker.

Prevention and cure method

Collect disease residues and bury them or burn them during the growing season.

Adequate application of mature organic fertilizer, timely and appropriate amount of topdressing, so as to achieve the combination of organic fertilizer and chemical fertilizer, nitrogen fertilizer and phosphorus and potassium fertilizer.

After the diseased plants were removed in time, 50% carbendazim wettable powder, 75% chlorothalonil wettable powder, 36% thiophanate methyl suspension, 1500 carbendazim wettable powder or 80% anthrax Fumei wettable powder were sprayed every 10 days or so for 2 times in a row.