Two main diseases of carnation

Carnation is most likely to suffer from leaf spot blight and calyx rot.

The spores of leaf spot blight remain in carnation plants and withered plants and spread through the air. When there is water on the surface of the plant for 10 hours, the bacteria can be soaked while it is wet. The symptoms of leaf spot blight are as follows: grayish brown leaves or petals with purple edges. The spots were formed by black spores, and the branches and stems began to wither from the internodes and then developed into a circle of withering around the stem.

The pathogen of calyx rot remains in the old leaves, lower stems or withered plants of carnation. The condition of high humidity is beneficial to the occurrence of bacteria. The symptoms are as follows: first, it begins to rot at the tip of the calyx, and then extends to the base of the calyx. For the prevention and control of these two diseases, in addition to pulling out the weeds around the carnation orchard, if the carnation is cultivated in the greenhouse, it must often provide ventilation to the greenhouse and keep low humidity. If irrigation is needed, it should be carried out in the early morning. When irrigating, there are two plastic pipes on both sides of the carnation seedling bed, and a flat fan-shaped nozzle is installed every 50 cm at an angle of less than 45 degrees from the ground. In this way, the leaves of the flowers can be prevented from getting wet with irrigation water. During the period of high humidity, spray or spray with mancozeb, carbendan, mancozeb or carbendane.