Diseases and their control of Ophiopogon japonicus

Ophiopogon root knot nematode disease

When Ophiopogon japonicus is infected with root-knot nematode disease, root knots of varying sizes will appear on the roots, and hair roots will grow on them. The ends of the hair roots will be infected by nematodes again, forming small root knots again, and the cycle will continue.

After cutting open the root knot, you can see a white, shiny spherical substance, which is the female adult.

Prevention and treatment methods

When planting, choose disease-free seedlings and be careful not to have insect pests on the roots of the seedlings.

When planting, do not rotate with other plants such as tobacco, but you can rotate with grass crops.

To treat the soil, put 5% chlorpyrifos granules into the soil before planting, mix it with the soil, and then plant.

Ophiopogon japonicus black spot

When Ophiopogon japonicus suffers from black spot disease, the leaves will first turn yellow and gradually spread to the base of the leaves. Then green, white, yellow and other water-soaked spots will appear, affecting the growth and appearance of the leaves.

Once infected with black spot, the disease will continue into the second year and continue to affect the growth of the plant. It is generally prone to occur during the rainy season.

Prevention and treatment methods

In winter, clean and prune the dead plants and diseased leaves and then dispose of them.

During the disease period, spray with 1:1:200 times Bordeaux mixture or 1000 times 50% carbendazim solution, once every 10 days, and spray about 3 times in a while.

Ophiopogon japonicus mole cricket disease

Both the adults and nymphs of this pest can eat the roots of seedlings, affecting the growth of the plants.

Prevention and treatment methods

You can sprinkle 3 kg of 5% phoxim granules or 5% methyl isothion granules on the potting soil and stop spreading when you see the pests die; or you can use spices to lure the insects and then kill them.