Common Pests and Control Methods of Chrysanthemum
You may not be aware of the knowledge about chrysanthemum in the flower clinic. Let's take a look at the common pests and control methods of chrysanthemum together with the editor!
Chrysanthemum nematode disease nematodes, also known as worms, are widely distributed in nature and are a kind of lower animals. The body is thin and long, with pointed ends, about 1 millimeter in length, and transparent. They can enter the leaves and flower buds of chrysanthemum through stomata, damaging cells and tissues, causing the diseased plants to show weak growth, stunted growth, and abnormal coloration, etc. Sometimes, triangular brown necrotic spots can be seen on the leaf surface. Nematodes overwinter in hosts or soil and spread through irrigation and transplantation. When propagating, cutting branches can be treated in hot water at 50℃ for 10 minutes to kill nematodes.
Cotton aphids are the main pests of chrysanthemum in the later stage and can transmit viruses. They can reproduce 20 generations, causing damage to tender leaves and shoots from September to October. Female aphids are reddish-brown or black, while nymphs are yellow-green. After being harmed, the branches can become rigid and leaves withered. Aphids often parasitize on plants such as hibiscus, prickly ash, or common bugbane during winter. Clearing surrounding host plants and using 40% dimethoate at a concentration of 1500-2000 times for spray control during the growing period.
Chrysanthemum longicorn beetle, also known as chrysanthemum tiger or heart borer, is a small longicorn beetle, about 6-11 millimeters long, with black elytra, sparse gray villi, a reddish abdomen, a red circular patch on the front chest plate, and antennae almost as long as the body. They lay eggs inside the stem after September and the larvae that hatch can bore into the stem center, gradually moving downwards, and pupating in the roots to overwinter. From May to July, the damage is severe, causing the plants to lose water and wither, and eventually die. manual removal in the early morning during the damage period, or spray control with 25% DDT at a concentration of 300 times, 40% omethoate at a concentration of 800 times, or injecting into the pest holes and sealing them.
Grubs are the larvae of scarab beetles and are common underground pests. They can bite off tender stems during the seedling stage and cause damage to the roots in mid-July, making the plants withered and yellow, and severe cases can lead to death. During the damage period, apply trichlorfon at a concentration of 1000-1500 times.
The above content on common pests and control methods of chrysanthemum is hoped to be helpful for green plant enthusiasts!