What should I do if I get red spots?

When the temperature is high, the humidity is high, and the ventilation is poor, the leaves of Zhu Dinghong are easy to be infected with leaf blight. At the initial stage of the disease, brown spots appear on the tip and edge of the leaves, and then expand into red spots, and in severe cases, small black particles appear on the spots, causing the leaves to wither and yellow earlier. The prevention and control methods are as follows:

1. Strengthen maintenance. We should pay attention to the ventilation of the cultivation environment, spray 2% ferrous sulfate solution every 10 days or so during the growth period, in order to improve the disease resistance of the plant, and turn the pot regularly to change the soil.

2. Spray alcohol. At the initial stage of the disease, 1000 times of topiramate or 1500 times of topiramate or 65% of Dysen zinc can be sprayed once a week for several weeks.

3. Remove the diseased leaves. The seriously diseased leaves should be removed and destroyed in time to reduce the source of infection.

Zhu Dinghong bulb nearly spherical, leaves 6-8, extracted after anthesis, bright green, flower stem hollow, slightly flat, with white powder; perianth tube green, cylindrical, perianth lobes oblong, tip, magenta, slightly green, throat with small scales. How to control the leaf blight of Zhu Dinghong

The damage of leaf blight generally occurs on the leaves. At the initial stage of the disease, the disease starts from the leaf tip and leaf edge. The disease spot is brown at the beginning, and extends inward in the shape of a fan, with dark brown on the edge and grayish brown to white inside. When the disease is serious, black grains appear on the disease spot, and the leaves wither early. In the greenhouse, high temperature, high humidity and poor ventilation are beneficial to the occurrence of the disease. Prevention and control methods: ① strengthen maintenance, control the salt content of basin soil, turn the basin and change soil regularly. ② pours 1% iron sulfate solution every 7-10 days. At the initial stage of the onset of ③, 50% trimethoprim was sprayed with 1000 times of thiophanate, or 65% of Dysen zinc 800 times of thiophanate (or 70% of topiramate). How to control the blight of red leaves in Zhu Ding

Zhu Dinghong (scientific name: Hippeastrum rutilum) is also known as Safflower (Hainan Flora), Huazilan (Economic Flora of North China), Huazhihua, Baizhilian, Dinghong, Zhu Dinglan, Guting Flower, Huazilan, Baizhilian, Baizhilian, pair Red, pair Red, and so on. It is a perennial herb of the genus Amaryllidaceae.

Zhu Dinghong bulb nearly spherical, leaves 6-8, extracted after anthesis, bright green, flower stem hollow, slightly flat, with white powder; perianth tube green, cylindrical, perianth lobes oblong, tip, magenta, slightly green, throat with small scales.

The damage of leaf blight generally occurs on the leaves. At the initial stage of the disease, the disease starts from the leaf tip and leaf edge. The disease spot is brown at the beginning, and extends inward in the shape of a fan, with dark brown on the edge and grayish brown to white inside. When the disease is serious, black grains appear on the disease spot, and the leaves wither early. In the greenhouse, high temperature, high humidity and poor ventilation are beneficial to the occurrence of the disease. Prevention and control methods: ① strengthen maintenance, control the salt content of basin soil, turn the basin and change soil regularly. ② pours 1% iron sulfate solution every 7-10 days. At the initial stage of the onset of ③, 50% trimethoprim was sprayed with 1000 times of thiophanate, or 65% of Dysen zinc 800 times of thiophanate (or 70% of topiramate).