Light shield green celestial calf Chelidonium argentatum Dalman, genus Coleoptera, Celestial calenidae.
【Host】Citrus, goji and other fruit trees.
【Harmful】The larvae eat small branches of citrus, resulting in the death of branches, and then moth down the branches until the large branches and trunks, resulting in weak branches, yellowing of leaves, dead branches, decline in growth of the whole plant, and sharp decline in yield.
【Morphological characteristics】 Adult insect body length 24 ~ 27mm, all dark green, glossy; ventral surface is initially milky yellow, later turn dark green, by silver gray short villi; head dark green, fine indistinguishment, antennae and feet dark blue or dark green, tarsal foot black; densely marked on the antennae stalk node, 5 to 10 segments of the end of the spikes; elytra dark green, full of fine dots and wrinkles; male antennae are longer than the body, the front chest is long, wide, etc., the end of the lateral thorn process is slightly blunt, the small shield is green, glossy; the ventral surface of the male can be seen 6 segments, and the posterior edge of the fifth segment is sunken. The ventral surface of the female worm is only 5 segments, and the posterior margin of the terminal segment is blunt and rounded. Eggs Oblong and round, yellow-green. The larvae are pale yellow, 46 to 51 mm long when mature, with unevenly distributed brown hairs on the body surface, small head, reddish brown, 3 pairs of tiny pectoral feet, 4 brown stripes on the anterior margin of the dorsal plate of the forethia, and a long, milky-white cortex hard patch on the posterior margin. Pupae Naked pupae, milky white or pale yellow, with a long-shaped head that sticks backwards to the ventral surface and a brown spiny hair on the back.
【Life Habits】Occurs 1 generation a year and is completed in New Year's Eve. The larvae overwinter in the host moth, and in mid-to-late April of the following year, they block both ends of the moth tunnel to pupate. Adults begin to appear from late April to early May and bloom from May to June. After the adult insect feathers out of the hole, take the host young leaves to supplement nutrition, and after the tail, choose the branch mouth of the host's young green branches or the branches of the petiole and the branches of the young branches to lay eggs, each egg is laid 1, covered with colloids, and the egg stage is 18 to 19 days. The adult insects are flexible, often resting in the upper part of the canopy, and flying with a little disturbance, but the flying power is poor in rainy days, which is conducive to manual capture. After hatching, the larvae spiral into the small branches from under the egg shell, and then moth the xylem along the upper end of the branches, and the infested branches die, and the larvae turn around and moth downwards, gradually mothing from the small branches into the large branches. The moth in the branches is a hole that slopes downwards at a certain distance to the outside, which is convenient for excretion of feces and wood chips, just like a hole, so it is called a blowpipe insect. Not far below the bottom of a hole, the larvae are hiding. Overwintering larvae pupate in the moth tract in April.
【Control method】 (1) Adult insects often inhabit branches and can be killed by hand. Between late May and June, the infested twigs can be seen wilting, at which time the larvae feed upwards and should be removed, and when the larvae turn around and feed downwards, the twigs are cut off and burned in a concentrated manner. (2) The agent poisons the larvae, first use the twig to block the second hole in the penultimate of the moth path of the affected branch, so that the larvae cannot escape upwards, and then inject 80% of the dichlorvos emulsion 30 to 50 times the liquid from the hole at the lower end, and close the hole to poison the larvae.