Impatiens red diamondback moth

DeilephilaelpenorlewisilButler is the main pest of Impatiens balsamina, which is distributed in Northeast, North, East and Northwest China. The host not only has impatiens, but also has autumn orchid, grass flower and so on.

The insect feeds on leaves in the form of larvae, which affects the growth and development of plants, and is the main pest of impatiens.

Morphological characteristics

The adult body is 33-40 mm long and the wingspan is 55-70 mm. Wings, body is red, with yellowish green flash. There are 2 longitudinal red bands on both sides of the head and back, and the topline and sides of the abdomen are red. The front wing is green, the hindwing is dark brown near the base, and the outer half is red.

The larva is 75-80 mm long, the head and forechest are small, the posterior chest is inflated, the body is densely reticulated, and the chest is light brown and scaly. The chest feet are yellowish brown with a pair of dark brown eyelike lines on the back of the first to second ventral segments. There are crescent-shaped and light brown spots in the middle of the lines. There is white around the spot. Each section has a light horizontal line on the back, a light diagonal line on the side of the body, and a dark brown tail foot on the ventral side of the abdomen, about 5 mm.

The pupa is fusiform, 42-45 mm long, grayish brown, with dark brown spots.

The occurrence regularity of the insect occurred for 2-3 generations a year, overwintered as a pupa, emerged as adults in April-May of the following year, began to do harm, and the adults had phototaxis. The eggs are generally scattered on the tender shoots and leaf tips of the host, the second generation adults appear in July, and the larvae feed on the leaves from June to October. After maturing, the larvae spin silk clay to make cocoons and pupate in the shallow soil layer.

Chemical control

(1) ploughing the soil in winter to eliminate overwintering pupae. The larvae can be killed artificially in the harmful period.

(2) protect and utilize natural enemies.

(3) according to its phototaxis, black light trapping can be carried out.

(4) Chemical control can spray 1000-fold solution of trichlorfon or 4000-fold solution of 2.5% deltamethrin during larval occurrence.

Trichlorfon and deltamethrin are commonly used.