Common diseases and control methods of lily

1. Bulb, scale rot and stem diseases caused by Fusarium

Symptoms: rotting plants with rotting bulbs and scales grow very slowly and have light green leaves. Underground, brown spots appear at the top of the scales, the sides or where the scales connect with the base plate, these spots gradually begin to rot, and if the base plate stem is infected, then the whole scale ball will rot. The disease in stem and leaf caused by Fusarium is a disease infecting the aboveground part. The distinguishing mark is that the basal leaves turn yellow in adolescence, and the yellowed leaves turn brown and fall off. In the underground part of the stem, orange to dark brown spots appear, and then the spot expands, and finally extends to the inside of the stem. After that, the stem rotted, and finally the plant died under age.

Prevention and treatment: thoroughly disinfect infected soil.

2. Rhizoctonia disease

Symptoms: if the infection is mild, it only harms the leaves in the soil and the green leaves in the lower part of the buds, with sunken light brown spots on the leaves. Generally speaking, although the growth of the plant is affected, it can continue to grow. If the plant is seriously infected, the growth of the upper part of the plant will be hindered, and the white leaves in the underground and those at the bottom of the shoot will rot or wilt, leaving only brown scars on the stem.

Control: disinfect the suspected infected soil with soil disinfectants to ensure that the soil is no longer infected; if the previous crops have been infected, you can not apply general soil disinfectants, then pre-treat the soil with Rhizoctonia control agents before planting (completely infiltrate into the soil 10cm depth).

3. Phytophthora disease

Symptoms: plant foot rot (Phytophthora) can hinder growth or cause it to wither suddenly. Soft rot occurs at the infected base of the stem, becoming dark green to dark brown, and expanding upward, the leaves turn yellow and begin to lose color at the base of the stem. Similar soft rot infection often occurs on the stem on the ground, causing the stem to collapse or bend.

Prevention and treatment: disinfect infected soil with general soil disinfectants; use fungicides to control Pythium during cultivation can also effectively control foot rot; ensure that the soil has good drainage conditions; prevent crops from being moist for a long time after watering: the soil temperature should be as low as possible in summer.

4. Pythium diseases

Symptoms: this kind of bacteria invades not only a single plant but also plants in an area, the plant is short, the lower leaves become yellow, the upper leaves become narrow, the leaf color is light, often wilting. On plants affected by root rot, flower buds dry and shrink. Pull up the plants and see transparent, beige rot spots on the bulbs and roots, or they become completely soft and rotten.

Prevention and treatment: disinfect infected or suspected infected soil with general soil disinfectants; keep the soil temperature low at the beginning of cultivation and adopt correct cultivation steps throughout the cultivation period: Pythium can be controlled by cultivation in boxes containing potted soil and peat.

Fungicides that are easy to spray on crops to control Pythium can be used after crop growth or in cases where Pythium infection may have occurred, preferably in the evening. Spraying water for a few minutes (about three minutes) before spraying will significantly enhance the effect of the fungicide and rinse the crops clean.

Disease prevention is more important than cure, and every healthy plant is necessary. People enter the disease from the mouth, while plants enter the disease from the root, so it is very important to maintain a good root system of the plant, which requires that the soil is bacteria-free and good air permeability.