How long does it take for a longhorn beetle to lay an egg that hatches into a larvae?

It usually overwinters in the trunk of a tree as a larvae or adult. After the adult worm emerges, some need to supplement nutrition, eating pollen, young branches, young leaves, bark, sap or fruits, fungi, etc., and some do not need to supplement nutrition. The lifespan of adults is generally more than 10 days to 1 2 months; But adults overwinter in the pupal chamber for up to 7 to 8 months, and males have a shorter lifespan than females.

The activity time of adults is related to the thickness and thinness of the small eye surface of the compound eye, which is generally thick, mostly active at night, and has phototaxis; Those with small eyes and thin faces are mostly active during the day. The oviposition mode of adult worms is related to the form of mouthparts, and generally the adult of the anterior mouth type lays eggs directly into the rough bark or cracks when laying eggs; The adult worm with a lower mouth first bites into a groove on the trunk of the tree and lays its eggs in the groove. The longhorn beetle mainly feeds on larvae, lives the longest, and causes the most serious damage to the trunk.

When the eggs hatch out of the larvae, the first instar larvae are bored into the trunk of the tree, initially feed under the bark, and after the inage increases, they burrow into the xylem for damage, and some species only stay under the bark to live, not into the xylem. The larvae move within the trunk of the tree, and the shape and length of the moth-eating tunnels vary from species to species. The larvae feed on the trunk or branches, opening their mouths into the bark at a certain distance as vents, pushing out excrement and wood chips.

When the larvae reach maturity, they form a wide pupal chamber, which is clogged with fibers and sawdust at both ends, and pupates in it. The pupal stage is about 10-20 days.

After watching for a long time, I didn't see that the eggs laid could hatch larvae in a few days.

The length of the life history of the longhorn varies depending on the species, and there are those who complete one or two generations in one year, and there are also those who complete one or two generations.

Two or three years or even.

Four or five years to complete the first generation. The life history of the same species in different regions is sometimes very different, for example, it takes three years to complete one generation in Jiangsu, while it takes two generations a year in Guangdong. Due to the hidden life of larvae, it is difficult to observe them in their life history.

In addition, due to the conditions of the host plant, such as old and young, healthy, dry and wet degrees, etc., it has a great impact on the growth and development of larvae. Adverse conditions often cause diapause in the larvae, which greatly prolongs the life generation. Therefore, the same species may show different developmental processes in the same area.

There are many records of long-lived larvae in the literature, most of which are made of wood, and after a certain period of time, it is suddenly found that there are still living larvae in it, or the longhorn beetle suddenly emerges and proves that it has lived in wood for many years. There have been many examples of this, proving that longhorn beetle larvae can live.

One or twenty years, and the two highest records are 40 years and 45 years. The longhorn beetle generally overwinters as larvae, or overwinters in the pupal chamber as an adult, that is, the adult that emerges in the autumn and winter of the previous year stays in the pupal chamber until the spring and summer of the following year. The lifespan of adults is generally not long, more than ten days.

One or two months, but adults overwintering in the pupal chamber may reach.

Seven or eight months. Males generally have a shorter lifespan than females. The active time of adults also varies among various species, some are active in daylight during the day, and the most active is the flower beetle; Others are active at night or on cloudy days, or they can be active all night.

Oviposition methods: There are two main ways, one is that the female worm first bites the bark with the upper jaw (especially the groove tibial longhorn beetle) before giving birth, and then inserts it with the oviposition tube, laying one egg per hole, and there are also multiple eggs. The shape and size of the oviposition hole formed in this way are often different among various species, and some are very significant, which can be used as an indication of searching for and exterminating insect eggs in the prevention and control.

Another method of spawning does not bite the hole first, but uses the spawning tube directly in the cracks of the bark to lay eggs. In a few cases, it is also produced on the smooth part of the branch. The spawning species are laid in the soil.

The newly hatched larvae usually feed under the skin and go through a longer or shorter period before penetrating into the woody part. A few species are only subcutaneously decayed. There are also types that are not deeply chiseled, and only harm the sapwood.

Many species infest the base or thick branches, some at the root and some at the branches. When larvae are eaten, various tunnels are drilled, up or down, left or right, curved or straight, depending on the species, but there are also many types of tunnels that are very irregular. The tunnel is often filled with insect droppings and fibrous wood chips, sometimes insect droppings and wood chips are discharged from the insect holes, and sometimes there is sap flowing out of the affected area.

Mature larvae often build wide pits as pupal chambers, which are closed with fibrous sawdust at both ends and pupate in them.

The natural enemy of the longhorn beetle: the swollen-legged bee of Guan's family.