What are the morphological characteristics of pear-like beetles?

The pear elephant was once mistaken for the North Korean elephant. Common names: pear dog, pear tiger and pear monkey. It mainly harms pear fruit, but also apples and peaches.

Morphological characteristics error: unable to obtain data luster, dense engraving and short hair. The head extends forward like a trunk; There are inverted small concave lines on the chest and back, and the engraved points on the coleoptera are thicker and arranged in 9 rows.

Egg: about 1mm long, oval, yellow and white, smooth.

Larvae: It is about 12 mm long, milky yellow, slightly curved, with many stripes on the back and degenerated chest and feet.

Pupa: about 8 mm long, yellow and white.

The occurrence law is 1 generation every year or every two years 1 generation, and adults and larvae overwinter in the soil under the tree. Unearthed the year after overwintering as an adult, every year 1 generation; Those who overwinter as larvae will not be unearthed in the second year, and adults in the third year, two years 1 generation. The unearthed time of adults is from early May to late July, and the peak period is from late May to early June. Every time it rains, a large number of adults are unearthed. If the climate is dry, the number of adults is obviously reduced. The unearthed adults began around the flowering of pear trees, and the largest amount was unearthed when the pears reached their thumbs. The unearthed adults first flew to the lower branches of the crown to eat the young fruits. After about 10 days, mating and spawning began, and the range of activities gradually expanded to the whole crown. When adults lay eggs, they first bite a wound at the base of the fruit stalk, and then bite a small hole in the fruit surface to lay eggs inside. Finally, the adult secretes a milky glue to seal it and turns brown after drying. Soon, the causal stalk of the fruit was injured and naturally fell off. Larvae live in the fruit for about 25 days and burrow into the soil. Some larvae pupate in the same year and emerge into adults; The other part overwinters as larvae. The loss caused by adult oviposition is the greatest. One female lays 70 ~ 80 eggs on average, with a maximum of 150 eggs, and the yield per fruit is 1 egg. In severe cases, the big year becomes a small year, and the small year becomes a dead end.

Adults have the habit of playing dead. When the temperature is low in the morning and evening, they are disturbed and pretend to be dead. When the temperature is high around noon, they are disturbed to play dead and fall, and fly away in the middle of the air.

Pear varieties suffered from different degrees, Xiangshui pear suffered the most, Yali pear and Pak Lei suffered a little less.