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Two stages of locust development: solitary or gregarious, breeding process, whether there is a pupa

Two stages of locust development: solitary or gregarious, breeding process, whether there is a pupa


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Legends of catastrophic locust invasions have come to us since the days of Ancient Egypt. It was then that she was rightfully awarded the title of one of the "Seven Executions of Egypt".

Moving in huge flocks, this "green attack" is able to cleanly destroy all green vegetation on the ground. Locusts do not disdain anything, be it tobacco or corn leaves, human clothing or seedlings of cereals in the fields. It flies in waves.

Having eaten, one batch of insects soars up, and another is in a hurry to replace it, and this continues until not a single green blade of grass remains on the surface of the fields, meadows, and even the bark of nearby trees is eaten.

Locust is an insect from the locust family. There are several types of locusts: desert, African, migratory (living mainly in the south of Russia), Australian, Moroccan.

Locust development stages

In representatives of the locust family indirect embryo development.

The development of the embryo in the world of animals and insects is of 2 types:

  • directwhen a child differs from his parents only in a smaller size and underdevelopment of organs (mammals);
  • indirectwhen a newborn baby (larva) differs outwardly from its parents.

In insects, the second type of development is also divided into 2 types:

  • complete metamorphosis (transformation), when females lay eggs, the larva hatches, grows up to a certain period, then there is a transformation into a pupa. This "puppet" period is called the resting stage. Inside the pupa, absolutely all vital organs are rebuilt and an adult species of insect is formed. Such a metamorphosis is characteristic of butterflies, flies, wasps, bees;
  • incomplete metamorphosis: absence of a "puppet stage", the larva immediately takes the form of an adult insect in the process of several molts. This metamorphosis is characteristic of bedbugs, cockroaches, grasshoppers and locusts.

Therefore, the statement that locusts have a pupa is incorrect and simply a delusion.

Locust breeding

How do locusts breed? The process is as follows: the male secretes and distributes around himself a special hormonal substancethat attracts the female. Then he jumps on his partner, as if saddling her on top and firmly attached to her by the genitals.

Then he lays spermatophore (sperm sac) into the base of the ovipositor (female organ with strong teeth, which serves as a kind of gimbal that allows you to dig into the ground and bury the egg) of the female. Mating usually takes a long time: from 2 to 14 hours.

Fertilized female finds wet soil, with the help of the ovipositor makes holes in it and starts laying eggs... Locusts give off a special foamy sticky substance, eggs are developing solid, this period is usually about 12 days, there are usually 50-70 eggs in the pod.

A newly born larva has to work hard to get out of the earth. To become an adult insect, the larva has to undergo 5 molts.

Having a constant food, they can reproduce all year round. During her life, the female makes from 6 to 12 clutches of eggs.

Caring for the offspring: the locust cannot be called a caring mother, since, unlike other insects (bees, wasps), which tend to place a supply of food in each cell (mink) where the egg laid by them is located so that the hatched larva has something to eat, it leaves their future offspring to the mercy of fate.

All stages of reproduction in pictures:

Mating process

Laying eggs

Larvae

Last molt

Forms of development

The uniqueness of this insect is that it has 2 forms of development:

  • single (filly) - a form of development with a sufficient amount of food;
  • gregarious... When the food supply becomes scarce filly flocks and fly in search of food... At the same time, their external appearance changes, the size of the body and wings is enlarged, this happens by friction of individuals against each other with limbs on which a special organ is located.

The mares turn into locusts, a real disaster for people, huge hordes of which in a matter of days can devour the entire crop in the fields, orchards and vegetable gardens. Along the way, the females lay eggs, from which the next year it is not filly but locusts that hatch.

Locusts are a real disaster for the world, a dangerous agricultural pest. In many countries there are so-called "locust organizations", one of the largest is located in London, which are looking for methods to combat the "green plague". But in some southern states, locusts are considered a delicacy food and are even bred in special incubators.

So, we described the type and process of breeding, and also answered the question: does the locust have a pupa?

Video

A short video about the locust mating process:


Watch the video: How to breed locusts. (May 2022).