1. Symptom: a disease caused by fungi, which mainly damages the leaves of lotus. At the beginning of the disease, the back of the leaves will produce blister like spots. When the epidermis of the diseased spot breaks, it will scatter yellow brown powder like rust.
2. Control methods: weeds and dead leaves shall be removed in time during maintenance, and they shall be destroyed in a centralized way to prevent fungal infection. In the early stage of the disease, it can be treated by spraying the plants with Triadimefon. Spray once every 10-15 days to effectively control the disease.
1. Symptoms: the disease is caused by the infection of seminiflora. At the early stage of the disease, the leaves will appear small brown spots with irregular or nearly round shape. If the control is not timely, the disease spots will gradually expand, causing the leaves to wither and die.
2. Control method: remove the infected leaves in time and burn them intensively. When the disease occurs, it is necessary to spray chlorothalonil to the plants immediately for treatment, once every 7-8 days. Continuous spraying 2-3 times can basically recover.
1. Symptoms: root knot nematodes mainly damage the roots of plants. When the disease occurs, the number of fibrous roots and lateral roots will increase, and white nodules will form on young roots. The above ground part of the diseased plant will grow slowly, the leaves will start to wither, and in serious cases, it will die early.
2. Control methods: the plants should be changed frequently to reduce the occurrence of pests. After growth, 80% dibromochloropropane 1000 fold emulsion can be used to irrigate the diseased plant.
