Identification and Control Methods for Common Diseases of Perilla

Perilla is very common in rural areas; you can see it growing wild everywhere along the roadside. In fact, perilla can be used both as a medicinal herb and as a side dish, making it a crop with very high nutritional value. Although there is a wide area of wild perilla in rural areas, as its value has been discovered, the market has begun to fall short of demand. So large-scale artificial cultivation began, but like other crops, perilla is subject to various pests and diseases. So what pests and diseases will occur? How should they be controlled? Let's take a look below!

1. Spot Blight

Disease characteristics: Spot blight is caused by fungi, mainly because the spot blight pathogen overwinters dormant deep in the soil layer and in diseased plant debris. When the temperature gradually rises, it begins to infect the plants, usually developing in late spring and early summer. It harms the leaves; after the leaves are infected, black spots appear on them, and the spots gradually spread and eventually grow larger, forming patches of varying sizes, after which the leaves wither and fall.

Control methods: When selecting seeds, choose varieties with strong disease resistance and good genetics, or select vigorous, disease-free plants as mother plants to save seed yourself. Try not to practice continuous cropping, to prevent repeated cropping; apply fertilizer at the right time to improve the plants' disease resistance, drain and irrigate promptly, and reasonably control planting density. After the disease occurs, sprays such as mancozeb can be used for control.

2. Dodder

Disease characteristics: When planting, many friends often find that patches of perilla are entangled by orange vines. The plants cannot grow upright, and after a period of time the leaves gradually wilt, turn yellow and fall off. This reduces the plants' photosynthesis. This is dodder, a disease that parasitizes plants; dodder wraps around the plants and absorbs the perilla's nutrients, causing the perilla to lack nutrients, be unable to grow, and finally die.

Control methods: Pay attention to seed selection, and when sowing, check whether there are dodder seeds, and if so, pick them out promptly. When applying base fertilizer, the farmyard manure must be fully decomposed; dodder seeds cannot withstand the heat of decomposed farmyard manure. Patrol regularly, and when dodder vines are found, pull them out roots and all to stop further growth. After sowing, spray an appropriate amount of Lasso emulsifiable concentrate for control.

3. Root Rot

Disease characteristics: Root rot is also a fungal disease, and it spreads in many ways, such as rain, growers' farming operations, farmyard manure and many other factors. It generally breaks out when temperature and humidity are uneven, when there is excessive water accumulation, when the soil is too poor, or under continuous cropping. Root rot mainly harms the roots; after the roots are infected, they begin to rot, the growth of lateral roots is hindered, causing insufficient nutrients, and the plants cannot grow effectively; in severe cases they wither and die directly.

Control methods: Similar to spot blight, continuous cropping must not be practiced, and repeated cropping must be avoided. When sowing, the seedbed should be deeply plowed and sun-exposed, then fully decomposed base fertilizer should be applied to improve the seedlings' resistance. Do a good job of field drainage and irrigation, improve the growing environment, and promptly pull out diseased plants and take them out of the garden for destruction. After the disease occurs, sprays such as thiophanate-methyl wettable powder can be used for control, once a week, for about a month or 20 days.

The above are the common diseases in perilla cultivation. Of course, there are far more than these few, such as powdery mildew, rust, and so on. Due to limited time, the editor has not covered them one by one, but if measures are not taken in time, these diseases will cause devastating damage to the plants. So everyone must take various preventive measures, strengthen management, and reduce the incidence of disease to a minimum. That's all for today's introduction. This article is for reference only. Thank you for reading and your support.