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A Detailed Guide to Common Diseases of Dianthus chinensis and Their Control Methods

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Diseases of Dianthus chinensis fall into two major categories: non-infectious diseases and infectious diseases. The specific control measures are as follows: 1. Control of non-infectious diseases. Non-infectious diseases are usually caused by imbalances in nutrients, water and temperature, as well as infection by harmful substances. Although Dianthus chinensis does not have strict requirements for water and nutrients, excessive drought will cause poor growth and an underdeveloped root system, thereby reducing its stress resistance; excessive moisture will cause a lack of oxygen in the soil, suffocating and rotting the roots. As for nutrient requirements, it is best not to use pure N fertilizer; too much N fertilizer causes excessive vegetative growth of branches and leaves, tender tissues, and poor air circulation between plants.

Diseases of Dianthus chinensis fall into two major categories: non-infectious diseases and infectious diseases. The specific control measures are as follows:

1. Control of non-infectious diseases

Non-infectious diseases are usually caused by imbalances in nutrients, water and temperature, as well as infection by harmful substances. Although Dianthus chinensis does not have strict requirements for water and nutrients, excessive drought will cause poor growth and an underdeveloped root system, thereby reducing its stress resistance; excessive moisture will cause a lack of oxygen in the soil, suffocating and rotting the roots. As for nutrient requirements, it is best not to use pure N fertilizer; too much N fertilizer causes excessive vegetative growth of branches and leaves, tender tissues, and poor air circulation between plants. Under such conditions, weak plants will be infected first. If control is not timely, diseased seedlings will be repeatedly infected, causing the disease to become epidemic and the Dianthus chinensis to die. Therefore, when planting Dianthus chinensis, the base fertilizer should mainly be farmyard manure, and the topdressing should mainly be P and K fertilizers. Keeping the ground appropriately dry during the hot season is an important measure to prevent physiological diseases. If the land where Dianthus chinensis is planted is near places such as oil refineries, fertilizer plants, or brick factories that produce harmful gases and dust, water should be sprayed frequently to wash off pollutants from the leaf surface. In addition, the lawn surface should always be kept clean and hygienic, especially after pruning, the pruned material must be cleared away completely. This not only ensures good air circulation for the Dianthus chinensis but also reduces the lurking of pathogens.

2. Control of infectious diseases

There are 3 types of infectious diseases of Dianthus chinensis: leaf spot, damping-off, and basal rot. All three diseases are caused by different fungi invading the plants, and they occur mostly during the high-temperature and high-humidity season from July to September. The pathogens can spread with wind and rain.

Fungicides that can be used include mancozeb, chlorothalonil, thiophanate-methyl, carbendazim, etc.

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