Common diseases and pests of white palm and their control

Common diseases of white palm

Brown spot

Brown spot disease is caused by the bacterium Phytophthora, which mainly exists in the soil. The pathogen invades the plant from the base of the stem. Initially, water-soaked spots appear on the leaves, which gradually turn brown and eventually rot, causing the entire plant to wilt. The specific prevention and control measures are as follows:

① Use 800 times of mancozeb manganese for prevention and control in the early stage of the disease, once every 4-5 days, for 3-4 times in a row, which can effectively prevent the spread of the disease.

② Use 1500 times of oxadiazine + 1000 times of cypermethrin hydrochloride as a mixture for spraying to effectively prevent and treat brown spots and damping off.

Root rot

Fungal disease, the pathogen can infect the roots, stems and leaves. Infection of the roots can cause root rot. When infecting leaves or stems, brown spots appear first. As the disease spreads, the leaves will wither and fall off. In severe cases, the plant will die. The prevention and treatment methods are as follows:

① If root rot is found, clean up the diseased plants in time. If the root rot is minor, remove the rotten part and replant. If the root rot is serious, throw it away directly. Clean up dead leaves in time to avoid infecting other plants.

② When the disease occurs, irrigate the roots with 1000 times solution of root rot.

Common pests of white palm

aphid

Aphids mainly suck sap through their needle-like mouthparts, causing the stems and leaves of white palm to become deformed or curled. There are many suitable insecticides, such as malathion, oxydemeton-methyl, aphidicide, and cypermethrin. When insect pests are found, spray the pesticide in time. If there are small amounts of insect pests, scrape them off with bamboo strips.

Thrips

When thrips occur, the leaves of the plants shrink, the growth is slow, and the internodes of the stems are shortened. Thrips are afraid of strong light and often gather in places with little light to cause damage. They are active on the host surface only on cloudy days, in the morning, evening and at night, which is one of the reasons why thrips are difficult to control.

When killing thrips pests, it is usually done at night or early in the morning. Spraying pesticides during the day will be ineffective if the insects are not visible. Commonly used pesticides include acetamiprid, chlorpyrifos, imidacloprid, etc.