Common diseases and pests of Podocarpus and their control methods

Leaf spot

Symptoms: There are oval and long light reddish-brown spots on the leaves, surrounded by chlorotic circles, which later expand into large irregular patches with black spots on them.

Prevention and control methods: Remove diseased leaves and spray pesticides in time. It can be sprayed with 500 times diluted 50% thiophanate wettable powder.

anthrax

Symptoms: Small brown spots appear on the leaves at the early stage of the disease, which then expand into round or oval shapes. The spots gradually dry up, and in severe cases the entire plant is infected.

Prevention and control methods: First, open the windows for ventilation to reduce indoor air temperature and humidity. Then spray with 1000 times diluted 70% methyl thiophanate wettable powder, or spray 70% methyl thiophanate 60% anthrax, fumei, multi-bacterium, etc. to prevent the disease from spreading further.

Red Spider

Symptoms: Podocarpus is attacked by red spider mites, its leaves fade, its chlorophyll is destroyed, dense small yellow spots and yellow spots appear on the surface, and they gradually shrink, turn yellow, and wither. In severe cases, they fall off and lose their ornamental value.

Prevention and control methods: Red spiders often hide on the back of branches, leaves or in densely covered areas. It is easier to catch them manually by using a net.

If chemical agents are used for treatment, you can use 20% trichloronate emulsion, add 800-1000 times water, make a solution for spraying. This drug has a good killing effect on adults, nymphs and eggs. You can also add 1000-1500 times the amount of DDT emulsion into water to make a solution for spraying.

Scale insects

Symptoms: The damage is widespread, sucking the juice from stems and leaves, causing poor plant growth, and even inducing sooty mold, causing large-scale damage to the leaves. Its peak period is earlier than that of red spider mites, and it often reproduces in large numbers in early spring.

Prevention and control methods: When the number is small, use a brush to remove it. In addition, you can also use 800-1000 times diluted Supusha for spraying. Mixing a certain amount of furadan into the culture soil has a preventive effect, but the efficacy is only three months.