Goldenrod giddings belong to the Coleoptera family, commonly known as plateheads, in addition to harming pears, but also harmful apples, betel sand fruits, peaches, etc., when serious: it is one of the destructive pests of pear trees.
Morphological characteristics, adult, copper-green, flattened body, truncated head, ventral blue-green, five blue-black longitudinal stripes on the dorsal plate of the forebreast, orange-yellow wing sheath edges, metallic luster, blue-black spots on the dorsal plate and wing sheath of the forebreast to form a longitudinal stripe. The ventral eyes are dark brown, kidney-shaped, the antennae are black, the cloth teeth are shaped, and the small shields are trapezoidal.
Egg, flat, oval, milky white.
Larvae, yellowish-white, flattened, small dark brown head, half-shrunk on the forech, forebreast is large, with a herringbone in the middle, and a slender abdomen of 10 segments.
Life history and habits, one generation or two generations a year, with larvae overwintering under the bark of the tree trunk or in the shallow part of the xylem, starting in April of the following year in the xylem moth feeding activities and pupals, pupal period of about 10 days, adult insects appear in early May, adult insects appear in mid-to-late May to early June, adults feathering to July, adults can bite pear leaves, eat leaf edges into gaps, adults like sunlight, morning and evening quiet leaf activity, flying at noon, laying eggs, mostly in the trunk of the main branch to the sun, laying eggs, mostly in the trunk of the main branch to the sun, under the skin of the egg, The egg stage is generally 8 to 9 days, and the larvae hatch and dive into the subcutaneous tissue and gradually penetrate into the phloem to eat vertically and horizontally. Excretion of feces in the worm passage in the rain causes mildew, hinders the production of healing tissues, destroys the transmission of nutrient tissues, causes the death of branches, and by November the larvae stop feeding and enter the overwintering, the adult worms have suspended death, and the life span is about 20 to 30 days, and the life expectancy can reach 40 days.
prevention and control methods,
1, in the middle of May, the use of adult insects have suspended death, in the morning to shake the branches, hunt adult insects, eliminate adult insects before laying eggs, the effect is good,
2, spray zinc thiophos 1000 times liquid and high efficiency cypermethrin 2000 times liquid during the adult occurrence period in mid-to-late May,
3. In July to August, when the larvae first moth into the skin, apply 5 times the dimethoate liquid to kill the larvae.