What pesticide is effective for controlling leaf roller worms?

Leaf roller worm is a common plant pest, also called green worm, oil worm, etc., mainly harming mulberry trees, so what pesticide is used for leaf roller worms?

1. Basic introduction to leaf roller worm

The Chinese scientific name of leaf roller worm is mulberry pyralid, an insect of the family Pyralidae, genus Glyphodes, mainly distributed in Jiangsu, Zhejiang, Sichuan, Shandong, Taiwan, China, Anhui, Jiangxi, Hubei, Guangdong, Guizhou and other places.

The specific damage of leaf roller worm is as follows: in summer and autumn, the larvae spin silk to bind leaves into rolled or folded leaves, and the larvae hide inside and chew the leaf flesh, leaving the leaf veins and upper epidermis to form a transparent grayish-brown film, which then breaks into holes.

The adults of leaf roller worm are phototactic, and they generally lay eggs on the back of leaves at the tip (2-3 grains laid together along the leaf vein). The egg stage is 28 days, the larval stage is 12—19 days, and the pupal stage is 5—27 days.

2. What pesticide is used for leaf roller worms?

Leaf roller worms are controlled with pesticides such as acetamiprid, Juanjuantou insecticide, indoxacarb, and methoxyfenozide. Generally, during the larval occurrence period, 75% phoxim 1000-fold solution can be sprayed at night to kill the larvae, or 90% trichlorfon technical material 1000-fold solution can be sprayed to kill them. During the adult occurrence period, sugar-vinegar solution is used for trapping and killing.

3. Other control methods for leaf roller worms

1. Physical

Black light lamps can be installed to trap and kill adults, and bundles of grass or piles of grass can be used to trap overwintering mature larvae.

2. Manual

In autumn and winter, promptly capture and kill overwintering larvae in fallen leaves, cracks, or near buildings; in summer, promptly capture and kill newly hatched larvae, and remove damaged leaves when necessary.