What are the common pests and diseases of perilla? Detailed explanation of efficient control methods

Perilla is very common in rural areas. As the value of perilla has been discovered, the market has begun to be in short supply, and large-scale artificial cultivation has begun. However, like other crops, perilla will experience various pests and diseases. So what are the common pests and diseases of perilla? Attached efficient control methods!

I. Septoria leaf spot

Disease characteristics: Septoria leaf spot is caused by fungi, mainly because the pathogen of Septoria leaf spot lurks deep in the soil layer and in diseased residues to overwinter. When the temperature gradually rises, it begins to infect the plants. It usually occurs in late spring and early summer, causing damage to the leaves. After the leaves are infected, black spots appear on the leaves. The spots gradually spread and eventually become larger, forming patches of different sizes, and then the leaves wither and fall.

Control methods: When selecting seeds, choose varieties with strong disease resistance and good genes. You can also select strong-growing, disease-free plants as mother plants to save seeds on your own. Try not to carry out continuous cropping to prevent repeated cropping. Apply fertilizer at the right time to improve the disease resistance of the plants. Drain and irrigate in a timely manner, and reasonably control the planting density. After the disease occurs, fungicides such as mancozeb can be used for spraying control.

II. Dodder

Disease characteristics: When planting, many friends often find that local perilla plants are entangled by orange vines, the plants cannot grow upright, and after a period of time the leaves gradually become wilted, yellowed, and fall off, causing the photosynthesis of the plants to decline. This is dodder, a disease that parasitizes plants. Dodder will wrap around the plants and absorb the nutrients of perilla, causing perilla to have no nutrients, be unable to grow, and eventually die.

Control methods: Pay attention to seed selection. When sowing, check whether there are dodder seeds. If there are, pick them out in time. When applying base fertilizer, the farmyard manure must be fully decomposed. Dodder seeds cannot withstand the heat of decomposed farmyard manure. Patrol regularly. If dodder vines are found, pull them out with their roots to prevent continued growth. After sowing, spray an appropriate amount of metolachlor emulsifiable concentrate for control.

III. Root rot

Disease characteristics: Root rot is also a fungal disease. Root rot has many ways of spreading, such as rain, farming operations by growers, farmyard manure, and many other factors. It generally occurs at a high rate under conditions of uneven temperature and humidity, excessive water accumulation, poor soil quality, and continuous cropping. Root rot mainly damages the roots. After the roots are infected, they begin to rot, and the growth of lateral roots is hindered, resulting in insufficient nutrients, preventing the plants from growing effectively, and in severe cases, directly withering and dying.

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

The above is Tuliu.com's introduction to the common diseases in perilla cultivation. Of course, there are far more than thesefew, such as powdery mildew, rust, etc. If not controlled 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 diseases to the lowest level.