Angelica sinensis Little Land Tiger

Ground tiger, also known as "ground silkworm", "black silkworm". It belongs to the family Lepidoptera. The angelica tigers are mainly small tigers and yellow tigers, and their harm and control measures are the same.

The main results are as follows: 1. The damage to Angelica sinensis seedlings is caused by the larvae, which goes out day and night, and the young stage is mostly harmful to tender leaves and tender heads, biting off roots and stems, resulting in lack of seedlings and broken ridges.

2. Morphological characteristics: the adult length of the tiger is 16-23 mm, and the wingspan is 42-54 mm. Female moths have filiform antennae and male moths have double pectinate teeth. The front edge of the forewing and the outer horizontal line are dark brown. There are obvious kidney-shaped lines, annular longitude and latitude and rod-shaped lines between the inner horizontal line and the outer horizontal line. The hind wings are gray and white, and the veins and edges of the wings are dark brown. Belly gray. The egg is hemispherical, milky white at first, then yellow, grayish purple on the eve of hatching. The body length of larvae is 37mm and 47mm. The head is yellowish brown, the body is yellowish brown to dark brown, and there are light longitudinal bands on the back. The body surface is rough and covered with small round black particles. The buttocks are yellowish brown with two dark brown longitudinal bands. The pupa is 18mm long and 24mm long. Auburn, glossy.

3. The occurrence regularity of the adult tiger is hidden during the day and active at night, which is the most active before and after dusk every day, and has a strong tendency to black light and sweet and sour alcohol. Adults lay eggs on low weeds less than 5 centimeters, and like to lay eggs on the back of leaves or young stems close to the ground. The larvae are 6 instar. Before the 3rd instar, the larvae are mainly concentrated on the host heart leaves, tender leaves and field weeds, and can feed day and night without entering the soil. After the 3rd instar, the larvae lurk in the topsoil layer during the day, bite off the seedlings at night and drag them into the hole. The mature larvae are pseudo-dead and immediately shrink into a ring when they are frightened.

The little tiger likes to be warm and wet. When the temperature is 18 ℃ ~ 26 ℃, the relative humidity is about 70%, and the soil water content is about 20%, it is beneficial to the growth, development and activity, and the harm is serious.

4. The first control measure is to remove weeds in the field in time, reduce transitional hosts and eliminate eggs and low-instar larvae. The second is to set up sweet and sour wine in the field to trap adults, brown silk and sack pieces to trap moths to lay eggs, and paulownia leaves to trap larvae. Third, 50% phoxim EC 1000 times and 2.5% deltamethrin 1000 times were applied to kill pests at the root of the seedlings.