The Latest Control Methods for Common Diseases and Pests of Chinese Yam

Chinese yam, also called Huaishan, is a common medicinal and edible Chinese herbal medicine in our daily lives. It helps with digestion, reduces sweating and stops diarrhea, and when combined with reishi mushroom, it is an excellent medicinal material for preventing and treating diabetes. With the development of its medicinal and health-care functions, its planting area is now increasing year by year, but along with this come diseases and pests, which cause huge losses to the yield and quality of Chinese yam. So what diseases and pests affect Chinese yam, and how should they be controlled? Let's take a look with Qinnong Web at the common disease and pest control methods for Chinese yam.

1. Anthracnose

Anthracnose mainly harms the leaves and stems of Chinese yam. In the early stage of the disease, small yellow-white spots appear on the leaves, gradually spreading into irregular lesions. The junction between the lesions and the leaves is brown, and black spots appear in the center. In the late stage of the disease, the lesions perforate and the vines wither. It is caused by spores overwintering safely on diseased plant debris and spreading the following year. It is most severe during high summer temperatures, often causing plants to wither and, in severe cases, die.

Control methods: Avoid continuous cropping, and practice a 2-3 year crop rotation with other crops. Remove diseased plant debris promptly before overwintering, disinfect the soil before planting, and increase the application of phosphorus and potassium fertilizer during planting to enhance the plant's disease resistance. When the disease occurs, spray with a 1000-fold dilution of thiophanate-methyl for control.

2. Brown spot disease

Brown spot disease, also called dead leaf disease, also mainly harms the leaves of Chinese yam. When it occurs, yellow-white lesions appear on the lower half of the leaves, and later the lesions spread and turn brown, with small black granules in the center. When these small granules rupture, they cause the leaves to perforate, and often when the disease is severe, the plant's leaves wither and die. This disease is likewise caused by spore pathogens overwintering safely on diseased plants and spreading with wind and rain the following year. The probability of outbreak is extremely high, especially in humid and rainy seasons.

Control methods: Likewise practice crop rotation, do a good job of field cleanup, and eliminate overwintering pathogens. After discovering the disease, promptly cut off diseased leaves, then spray zineb, and then use chlorothalonil wettable powder for large-scale spraying control.

3. Root rot

Root rot mainly harms the rhizome part of Chinese yam. It is not easy to notice when the disease occurs in the root system. In the early stage of the disease, small brown spots appear at the base of the vine stems. Over time, the lesions gradually expand and turn dark brown, and the center of the lesions becomes sunken. When the disease is severe, the lesions have brown mold-like filaments, and the rhizome shrinks and rots, ultimately causing the plant to die.

Control methods: This disease is mainly spread through soil and diseased fertilizer, and is extremely likely to occur in high-temperature and high-humidity environments. Practice crop rotation, collect and clean up diseased debris, disinfect both seeds and soil before planting, and when the disease occurs, use a 600-fold dilution of 75% chlorothalonil wettable powder for root drenching.

4. White grubs and red spider mites

White grubs mainly harm the root system of Chinese yam, often gnawing on the root tubers, causing slow growth and affecting quality; red spider mites mainly harm the leaves, often gathering on the undersides of Chinese yam leaves and sucking the leaf sap, causing the leaves to lose water, turn yellow and drop, resulting in plant stunting and premature aging.

Control methods: White grubs can be poisoned by pouring a 1000-fold dilution of trichlorfon, while red spider mites can be killed by spraying a 1200-fold dilution of tetradifon.

The above are the common disease and pest control methods for Chinese yam brought to you by Qinnong Web. Due to factors such as region and climate, the characteristics of Chinese yam all differ, but disease and pest control must not be taken lightly. Doing a good job in disease and pest control is the prerequisite for achieving high and superior yields of Chinese yam.