Grey mould is one of the common diseases of Coreopsis. It mainly damages the leaves and stems of plants, making them spot or rot.
Grey mould usually occurs when the humidity is high. When the fungus spore propagates and infects the Coreopsis, it will produce pathological changes. The environment is the main factor for the occurrence of grey mould of Coreopsis nigra. Therefore, it is necessary to strengthen management, water and apply fertilizer reasonably, pay attention to ventilation, timely drainage in rainy season and keep sanitation. When black heart chrysanthemum occurs grey mould, need to spray medicament in time for treatment.
Black heart chrysanthemum flower leaf disease, will appear on the leaves mottled or flower leaves, look smaller, and deformity.
Mosaic is mainly caused by viruses and can be transmitted by insects. It is necessary to select healthy disease-free plants when planting Coreopsis. To prevent mosaic, we need to control pests and spray some chemicals.
Root rot is a common disease of plants, and sometimes it occurs in Coreopsis, mostly because of excessive water, ponding soil, poor drainage, and poor ventilation. In order to prevent and control root rot, we should pay attention to watering reasonably, keep the growing environment ventilated, and treat the root rot in time.
The main pest of Coreopsis nigra is aphid. When aphids are frequent, aphid will occur. Aphids are harmful, not only to the leaves and even the whole plant, but also to the occurrence of diseases such as mosaic.
It is difficult to control aphids. Once it is found, it needs to be treated in time. Mainly by artificial killing, making some safe insecticides to kill insects, pay attention to keep the environment ventilated.
