The French green leaves I planted are sick. Want to know what disease it is, how to treat it and what medicine to take? The planting area has not seen sunshine for many years.

Summer is mainly characterized by high temperature and humidity, which can induce plant leaves to be moldy or bacteria to grow, including powdery mildew and whitefly. However, in either case, it is necessary to remove redundant old diseased leaves and increase ventilation and light to alleviate them. If the white powder is serious, chemical agents can be sprayed. Powdery mildew is a fungal disease, and whitefly is a tiny insect that needs to be distinguished.

breeding method

The propagation and cultivation of French green is mainly cuttage propagation, and it can also be sown and propagated. Cutting propagation is not only simple, but also takes root quickly and has a high survival rate, so it is widely used in production.

The cutting seedbed should choose a plot with high terrain, deep soil layer, loose soil and good drainage and irrigation. After removing the grass roots and stones, make a ridge of about 1- 1.2m, and irrigate with 10% imidacloprid 1000 times and 5% mancozeb 1500 times to remove underground pests and harmful bacteria. After leveling the seedbed, pat it flat with a spade, pour Lamla Trim fertilizer, and then spread a layer of screened burnt mud ash or yellow mud on the bed surface with a thickness of about 5 cm.

Cutting should be shallow, not deep, and the cutting level of branchlets should be downward, and the depth of mother plant should be1cm; The cutting depth of big branches is 1 cm when the next stem node is inserted into the middle and upper part, and the cuttings are inclined to the ground by about 45 degrees. Shallow and oblique cuttings are beneficial to rooting and survival in advance. After cutting, the soil around the cuttings should be compacted and watered once immediately to make the lower part of the cuttings stick to the soil. Generally, the row spacing of cuttings is 12- 15cm, and the plant spacing is 6-8cm. When cutting, it is not advisable to leave too many leaves on the cuttings or to cut them all off. The lower leaves can be cut off with the petiole, and the upper leaves are left with 2 pieces. According to the size of leaves, each leaf should be cut off from 1/2 to 2/3 to reduce excessive consumption of water and nutrients.