Growing habit of Marshmallow
Yellow Marshmallow is widely distributed in China, East, Central, North and South China, and is widely cultivated all over the world. I like full sunlight, can also tolerate semi-shade, but avoid waterlogging. Salt and alkali tolerance is strong, in the soil containing 0.6% salt can still grow. Cold hardy, can safely overwinter in the open ground in North China. In the well-drained, organic matter-rich loose fertile sandy soil grows well.
Methods of propagation of marshmallow
1. Sowing: North China sowing is usually the year of sowing, the year of flowering. About a week after the seed germination, to grow 2 to 3 true leaves, transplant once.
2. Splitting: the split propagation of marshmallow can be carried out in August-September. Dig out the old plant, use the fibrous roots to separate the stem and buds to regenerate the planting, watering and irrigation immediately after planting, the next year will bloom.
3. Cuttings: Marshmallow can be cut in the spring, the stem at the base of the germination as a plug. The cuttings are 7-8 centimeters long, and the substrate is sandy soil. After cutting, shade the roots.
Methods of planting marshmallow
1. Watering: when marshmallow seedlings grow 2~3 true leaves, they should be transplanted once and increase the spacing between plants. After transplanting, watering should be timely. Appropriate watering during the flowering period to promote a long flowering period and good flowering, until it reaches the top of the stem.
2. Fertilizer: During the growth of Marshmallow seedlings, pay attention to fertilization, weeding, loosening the soil, so that the plant grows healthily. After the formation of flower buds in the leaf axils, phosphorus and potassium fertilizer should be applied, and a few basal leaves should be cut off.
3. Break the roots: when planting marshmallow, in order to keep the plant low and prevent it from falling over, you can cut the roots into a cone shape around the plant in June, cut it once every 2~3 weeks, and then water it immediately for maintenance.
4. Harvesting: Marshmallow fruit should be harvested immediately when yellow ripe, so as not to scatter the seeds. After the flowering period, you can cut off the above-ground part of the plant, when the new shoots sprout, you can form clumps of plants. Yellow marshmallow is easy to aging, cultivation 2-3 years after the new.
Manipulation of pests and diseases of marshmallow
1. Marshmallow rust
Harm perennial old marshmallow is susceptible to marshmallow rust, infected plant leaves yellow or dead, the back of the leaf is visible as a brown, powdery spore mound.
Prevention and control in the spring or summer on the plants sprayed with Bordeaux solution or before sowing the seeds can be sterilized, can achieve the effect of prevention and control. At the early stage of the disease, spray 15% triazolone wettable powder 1000 times, or 70% thiophanate-methyl wettable powder 1000~1500 times, or 75% chlorothalonil wettable powder 600 times and so on. Every 7~10 days, 2~3 times in a row, all have good control effect.
2. Red spider
Harm Marshmallow is harmed by red spider during the growth process.
When serious disease occurs, it is appropriate to spray 1.8% abamectin emulsion 7000~9000 times or 15% pyridaben emulsion 2500~3000 times. Dichlorvos is used to kill mites. Dichlorvos stimulates the reproduction of mites. Don't use pyrethroid pesticides, which are basically ineffective for mite control.
3. Cotton leaf borer
Harm Sometimes marshmallow and cotton leaf borer harms marshmallow leaves.
Control occurs, can be sprayed 500-700 times the content of 16000IU / mg of Bt wettable powder, 1500-2000 times the 25% of diflubenzuron suspension or 1500-2000 times the 20% of the Miman suspension.
4. Mucous membrane leukoplakia
Harm Marshmallow leukoplakia mainly harms the leaves of marshmallow. At the beginning of the disease, there are small brown spots on the leaves of marshmallow. With the development of the disease, the spots gradually expand into round, oval or irregular, the center of the spot gray-white, the outer edge of the reddish brown. In a humid environment, a gray-brown layer of mold can grow on the spots.
Prevention and control of timely removal of diseased leaves, pay attention to