What are the common pest and disease control methods for garland chrysanthemum?
Garland chrysanthemum is also called emperor's vegetable, and legend says it was a delicacy of ancient imperial courts. Although its taste is slightly bitter, it is extremely nutritious, rich in various vitamins as well as calcium and iron, and also has the effects of purifying the blood and nourishing the heart, lowering blood pressure and moistening the lungs. Therefore, it is a relatively popular vegetable on the market, but as the planting area and yield gradually increase, pests and diseases follow. So what pests and diseases occur when growing garland chrysanthemum, and how should they be controlled? Let's take a look together with Qinnong Web.
1. Downy mildew
Downy mildew mainly harms the leaves. It is spread by fungal infection. The mycelium overwinters on the host, and in the following year the spores spread through wind and rain, invading through the stomata of the leaves. When the disease occurs, faded diseased spots appear on the leaves. As the spores reproduce and grow, the leaves gradually turn yellow and lose their green color, and finally white mold layers appear on the diseased spots on the back of the leaves, just like frost in winter, hence the name downy mildew.
Control method: Before planting, collect the diseased residues in the planting site and burn them, then plow the soil deeply to eliminate the overwintering of pathogens. During planting, strengthen management, apply more phosphorus and potassium fertilizer, and increase the disease resistance of the plants. When the disease occurs, spray with 250 times diluted Shuangyiling wettable powder for control.
2. Damping-off
Damping-off mainly occurs during the seedling stage of garland chrysanthemum and mainly harms the base of the stems of the seedlings. When the disease occurs, irregular brown diseased spots appear at the base of the roots. Diseased seedlings wilt during the day but recover to their original state at night. As the disease develops, the diseased part begins to sink and constrict. When the diseased spots completely spread and encircle the stem for one full circle, the plant begins to wither and die.
Control method: Disinfect the seeds and soil to prevent the invasion of pathogens, strengthen management before and after planting, pay attention to disease control, and after the disease occurs promptly spray with 1200 times diluted methyl tolclofos-methyl emulsifiable concentrate for control, or dilute Dajiangjun + Menshen at 600 times and pour it on as irrigation. These two methods can both achieve control.
3. Leaf spot
Leaf spot, as the name suggests, mainly harms the leaves, and after the disease occurs irregular diseased spots also appear, with concentric rings inside the spots. As the disease develops, the diseased spots gradually turn brown. In addition, it also spreads from the leaves to the stems and petioles, causing the plants to wither and affecting yield and quality.
Control method: Rotate with other crops, avoid continuous cropping, choose plots with good drainage for planting, apply more phosphorus and potassium fertilizer during planting to increase the disease resistance of the plants, and promptly remove diseased leaves when diseased plants are found. When the disease occurs, spray with 200 times diluted Wuyi mycin aqueous solution or 6.5% thiophanate-methyl dust for control.
4. Aphids
Aphids are a common pest of many vegetables. They like to live in groups and often suck dry the tender parts of plants such as leaves, young branches, and flower buds, causing leaves to shrink, curl, and become deformed. If the aphids are severe, they can cause the entire plant to wither and even die.
Control method: Before overwintering, gather and burn the weeds and debris in the field to prevent insect eggs from overwintering. Natural enemies can be used for control, or spray diluted Yamchqing emulsifiable concentrate for control.
The above are the common pest and disease control methods for garland chrysanthemum brought to you by Qinnong Web. The introduction to pest and disease control methods for garland chrysanthemum ends here. We hope it can help you. For more agricultural knowledge, please follow Qinnong Web.