Symptoms: this disease is one of the growing diseases, mainly manifested in the leaves. At the beginning, there are small yellow spots on the leaves, and at the end, there are small yellow brown abscess spots, showing irregular state. After rupture, there are scattered yellow brown powder. If it is serious, the leaves will wither and die early.
Prevention and control: at the beginning of the disease, you can use 400 times of 25% Triadimefon solution, which has a good effect.
Symptoms: when iris is infected with this disease, the part of the new leaf apex starts to turn yellow, and then the bulb part rots. In the later stage, when it is serious, all the leaves will turn yellow, and the whole bulb part rots.
Prevention and treatment: when this disease is found, it needs to be treated by spraying medicine in time, and it can be treated by spraying Bordeaux solution.
Symptoms: the harm of this pest is also very serious. Adults appear in September October. Before that, the larvae will parasitize on the roots and stems of the plant and lie on them to eat, causing poor plant growth. In serious cases, it can cause the whole plant to die, seriously affecting the growth.
Control: 90% trichlorfon solution can be used for root irrigation. In addition to this medicine, malathion emulsion, Phoxim and other chemicals can also be used.
