Canna Pests and Control Methods

Canna Pests: Leaf Rollers

symptom

In summer and autumn, the larvae spin silk to wrap the leaves into rolled or folded leaves. The larvae hide in the leaves and chew the leaf flesh, leaving the veins and upper epidermis, forming a transparent gray-brown film, which then breaks into holes, called "opening a skylight".

Although canna is highly adaptable, we must pay attention to the invasion of leaf rollers on canna from May to August every year to avoid damaging the tender leaves and inflorescences.

Prevention and treatment methods

In autumn and winter, overwintering larvae on fallen leaves, in cracks or near buildings should be killed in time. In summer, newly hatched larvae should be killed in time, and the affected leaves should be removed when necessary.

You can spray 800 times diluted 50% DDT or 1000 times diluted 50% carbendazim emulsifiable concentrate for prevention and control.

Canna pests: banana budworm

symptom

The adult banana budworm will lay eggs on the leaves, tender stems and petioles of canna. When the larvae hatch, they will crawl to the edge of the leaves and bite the leaves. The banana budworm will also spin silk to stick the leaves into a roll shape. In the morning and evening, they will crawl onto the outside of the roll and bite nearby leaves.

Plants that are severely infested by banana bract borers will have a large number of leaf bracts and incomplete leaves, which seriously affect the growth and ornamental effect of cannas.

Prevention and treatment methods

When you find leaves infested by banana bract borers, remove the bracts in time and kill the larvae.

Before the larvae hatch and form leaf bracts, kill them with 1000 times diluted 90% dichlorodiphenyltrichloroethane, or spray with 1000 times diluted dichlorodiphenyltrichloroethane in the morning or evening.

Canna Pests: Cutworms

symptom

Cutworms are polyphagous pests. The main harm to canna is the larvae, which bite off the stems of the seedlings near the ground, causing the death of the entire plant.

Prevention and treatment methods

When cutworms are found to be harming canna plants, they can be captured manually or 600-800 times diluted dichlorodiphenyltrichloroethane can be injected into the soil around the roots for prevention and control.