The causes and control measures of the latest dried tip of green onion

Green onions are widely planted in China, mainly concentrated in the northern areas, but the phenomenon of dry tip will appear during planting, which has become a major obstacle to the production of green onions, which often leads to the decline of the yield and quality of green onions, which directly affects the income of farmers. So what is the reason for the dryness of green onions? How to prevent and cure it? Let's take a look.

1. Disease dry tip

Disease is one of the main reasons for the dry tip of Welsh onion. When the disease occurs in Welsh onion, there are bluish-white spots in the affected area, which gradually spread into gray-white spots, resulting in the withering of leaves from the bottom down, forming a dry tip phenomenon. When Botrytis cinerea occurs, there will also be white spots on the leaves, which begin to develop downward from the leaf tip, and gray mold will also appear on the disease spots with high humidity. Root rot disease will also cause green onion leaf tip yellowing, gradually withering and death, these three diseases will lead to dry tip phenomenon.

Prevention and control measures: when the epidemic disease occurs, frost blight can be sprayed on leaves or root irrigation; Botrytis cinerea can be sprayed with Pythalide and Prohydantoin; root rot can be controlled by spraying chlorpromazine and Metalaxyl.

2. Pest stem tip

Many pests can also lead to the dry tip of green onions, such as thrips, which mainly harm the leaves of green onions, resulting in grayish-white irregular spots and, in severe cases, withered leaves. Similar to thrips, the same is true of Liriomyza huidobrensis and Spodoptera exigua, whose larvae eat into the leaves and eat the mesophyll, leaving only dry epidermis.

Control measures: thrips can be sprayed with bifenthrin, Liriomyza huidobrensis can be sprayed with cystamine every 5 days for 2-3 times, and beet armyworm can be sprayed with methylaminoavermectin benzoate and mites.

3. Physiological dry tip

In addition to the phenomenon that diseases and insect pests lead to the dry tip of green onions, improper management in daily management will also lead to the dry tip of green onions. Green onion in the lack of calcium, boron deficiency will lead to its growth and development hindered, resulting in dry leaves, dry tip phenomenon occurs. Lack of moisture in plants can also cause dry tips; too high concentration of chemicals can also lead to whitening or dry tips at night.

Control measures: to apply sufficient base fertilizer, mainly organic fertilizer or farm manure, when it is found that the plant is lack of trace elements, it should be supplemented by foliar fertilizer spraying. Attention should be paid to water management, timely watering in times of drought, and drainage in the rainy season, keeping the soil water content at 60% and 80%. In the use of chemicals should be carried out in strict accordance with the instructions, should not be too concentrated, after the occurrence of drug damage should be timely spraying relief drugs.

The above are the reasons for the dry tip of green onions and the introduction of prevention and control measures, hope to help you, want to know more related knowledge, please follow us.