Iris pest control

Scarab

harm

When the soil is dry during the seedling stage of iris, it is very easy to be infested by beetles, which damage the roots and rhizomes. There are two common types:

Northeastern black-gilled beetle: The larvae are milky white, 35 to 45 mm long, with a shiny reddish-brown head.

Green beetle: The larvae are milky white, plump, with a "C"-shaped abdomen and brown spots on the head.

Prevention

Gardening control: use the phototaxis of adult insects to catch and kill them, and deep plow the soil. Apply sufficient basal fertilizer to reduce egg laying by adult insects.

Drug control: Spray dichlorvos powder, or mix chlorpyrifos granules with fine soil, sprinkle evenly in the potting soil, and turn the soil to check and kill.

Belamcanda borer

harm

In early April, the eggs begin to hatch after the insects overwinter. In May, the larvae appear and damage the above-ground parts. In June, they attack the rhizomes. It mainly harms leaf tips, stems, pedicels, and young heart leaves, and in severe cases causes the plant to wilt.

Prevention

To nip the pests in the bud, May is the best time to spray. Spray 2000 times phosphamide emulsifiable concentrate or 1200 times diazinon solution. You can also use hormones to artificially kill the larvae according to their appearance patterns.

snails

harm

Snails are often active in the evening or morning, sucking on leaves, flowers and rhizomes, causing damage to stems and leaves, and even biting off seedlings. Plants are more susceptible to damage by snails when the plants are densely planted, the soil is moist, or the environment is warm and rainy.

Prevention

Spray 3% lime water to kill.

Mix snail enemy with corn flour and sprinkle it on the edge of the pool in the evening.

Artificial hunting is carried out in the early morning or evening on rainy days.