Common diseases and pests in Frost Morning and their control methods

Common diseases of Frost Morning

Rust

After the frost is infected with rust, large rust-brown spots appear on the epidermis of the stem and extend upward from the base of the stem. In severe cases, the stem is covered with spots.
Prevention and control measures: Cut off the diseased leaves, allow new buds to sprout again, and then spray with 2000-3000 times diluted 12.5% ​​diniconazole wettable powder.

Black rot

During the high temperature season in summer, the resistance of frost plant is very low, and it is the peak period of black rot.

Black rot is caused by the fungus "Fusarium oxysporum", professionally known as Fusarium wilt. The pathogen is Fusarium oxysporum, which belongs to the subphylum Ascomycetes. It specifically causes vascular diseases of ornamental plants. The main symptoms are root rot, stem rot, stem base rot, flower rot, etc.

Prevention and control methods: combination of ventilation, air permeability and heat dissipation.

The stuffy potting soil not only creates conditions for the reproduction of Fusarium oxysporum, but also reduces the resistance of the roots. Especially after watering and being exposed to the sun, the temperature of the roots in the soil soars.

After cutting off the black rot parts, soaking the roots with carbendazim can effectively prevent and control it.

Common insect pests in Frost Morning

Root-knot nematodes

Root-knot nematodes will burrow into the stems of the frost plant and eat the plant, causing the heart to rot and the leaves to fall off.

Prevention and control methods: Fill pots with carbendazim. When the damage caused by insect pests is not very serious, you can use carbendazim to irrigate the pots to kill the root-knot nematodes.

If the infestation is already serious, you can try cutting the top of the plant and then burning the mother plant with root-knot nematodes.