Are dragonfly larvae water bugs pests or beneficial insects?

The larvae of the dragonfly are beneficial insects. Dragonflies, invertebrates, phylum Arthropods, Insecta, Winged subclasses, Dragonflies, Paraptera, Dividing Dragonflies and Flyflies. Generally large, with long, narrow wings, membranous, reticulate wing veins with extremely clear veins.

Extremely sensitive vision, 3 in one eye; antennae 1 pair, thin and short; Chewing mouthparts.

The abdomen is elongated, flattened, or cylindrical with an anal appendage at the end. The feet are thin and weak, with hooked spines that catch pests while flying through the air. The larvae (larvae) develop in water and breathe with the rectum and tracheal gills in the water.

Generally, it takes more than 11 molts, 2 or more years to crawl out of the water along the aquatic weeds, and then finally molt and emerge into adults.

In the water, larvae can prey on animals or other small animals, and sometimes cannibalism of their own kind. Adults generally fly in ponds or rivers to prey on flying insects. In addition to a large number of mosquitoes, flies and other harmful insects, some can also prey on butterflies, moths, bees, which are beneficial insects.

There are more than 5,000 known species of dragonflies.

Extended Materials. 1. Common beneficial insects include bees, dragonflies, praying mantises, ladybugs, etc., which can produce honey, devour and catch insects, which is beneficial to human life. Common pests include locusts, aphids, beetles, termites, mosquitoes, flies, fleas, lice, etc., which feed on crops, destroy trees, and damage buildings.

2. Dragonflies mainly include two major types of insects, one is dragonflies; The other category is damselfly. Dragonflies are carnivorous insects that diverged from an evolutionary clade that existed in the Triassic period (about 200 million years ago). To date, about 6,500 species of dragonflies have been discovered and described.

3. Although dragonflies and damselflies are similar in appearance, they are very easy to distinguish: dragonflies are generally larger, and when they fly and stop, they always stretch out two pairs of wings flat on both sides of their bodies; The damselfly, on the other hand, is petite and cute, and always holds two pairs of wings upright above the back of the body when resting. There are many beautiful species of these two types of insects, and the names "dragonfly" and "damselfly" are very pleasant to hear.

It should be a beneficial insect, because the water fly can become a dragonfly, and the dragonfly is a beneficial insect, so the larva of the dragonfly is also a beneficial insect, and it should not belong to the pest, but to the beneficial insect.

It's a pest. Because this bug has a certain virus, it is a pest and has damage to the ecological environment.

The beneficial insects, dragonflies and its larvae eat food that is pests, and this bug is good for the crops in the field.

Dragonflies are beneficial insects. Dragonflies are beneficial insects, which are carnivorous insects and like to catch mosquitoes and flies.

As well as small butterfly moths and many other agricultural and animal husbandry pests, it is an important insect that is very good for humans.

At the same time, dragonflies can also be used as an insect to detect environmental pollution. Dragonflies like to live in humid environments, generally flying by rivers or ponds, its larvae need to grow in water, adult dragonflies are through a little water, lay eggs into sleep, and then go to catch other aquatic creatures, and wait until they emerge before they will slowly crawl out of the water to mate and lay eggs.

Introduction

Aedes aegypti. is spreading dengue fever.

Dragonflies are the natural enemies of this mosquito and have a strong ability to prey on the Aedes aegypti mosquito. At present, the most effective way to prevent dengue fever is to reduce the number of Aedes aegypti mosquitoes around humans, and controlling the number of dragonflies, and subsequently, the number of Aedes aegypti mosquitoes is an efficient and feasible way to stop the spread of dengue virus.

The dragonfly eats a very large amount of food, a large green dragonfly commonly known as "blue-headed stunned".

It can eat nearly 3,000 mosquitoes in a day. And the water fly.

It is not inferior to its "evolutionary body" at all, and can eat 2,000 children a year. But then it was discovered that water flies could be made into unusually delicious food, so they were on the human menu and became the target of capture, and their numbers were declining sharply, which also led to a rapid decline in the number of dragonflies.

Dragonflies are beneficial insects that prey on a variety of agricultural, forestry and animal husbandry pests such as flies, mosquitoes, leafhoppers, midges and small butterfly moths, and are beneficial insects to humans.

Dragonfly insects are abundant in resources and play an important role in many ways. First of all, as a representative class of aquatic organisms, its larvae can monitor water pollution, and some species contain some active substances that can be used as medicinal materials, and their bodies are rich in protein, amino acids, minerals, etc.

Dragonflies' amazing ability to hunt

We know that due to long-term co-evolution, any carnivore will not have a high success rate of predation, because the prey will become difficult for you to catch depending on your hunting characteristics.

Among mammals, the African spotted hyena may have the highest predation success rate, fighting collectively with a success rate of up to 85%, while those who fight alone have a surprisingly low success rate, which is only about 5% more successful than a tiger.

If you've ever seen the flight of mosquitoes dodging rain strikes on rainy days**, you'll be shocked by their ability to fly, but the strong have their own strong hands, and the typical prey of dragonflies is mosquitoes.

A dragonfly eats 30-100 mosquitoes a day, and they are single-working, catching mosquitoes in flight and eating mosquitoes in flight, and some studies have found that their hunting success rate is as high as 90%-95%. Probably no predator has a higher success rate than them, making them a highly successful species that can be found all over the world.

Of course, it is not a matter of one or two days for dragonflies to eat mosquitoes, but mosquitoes have no way to take them, so they can only deal with predatory pressure in another way, enhance their reproductive ability, and try to make dragonflies unable to eat them all. Dragonflies' success is not only due to their ability to fly, but also to their eyes, and if you look at the head of a dragonfly, you will see that their entire head is almost covered by eyes.

Their compound eyes have 30,000 facets, each of which carries information about the insect's surroundings, giving them near-360-degree vision (only behind them is a blind spot). This eye of a dragonfly is kind of like we're walking into a room with 30,000 surveillance screens, each screen is doing different things, and we certainly can't handle that huge amount of information, but they do.

This is one of the reasons why they successfully chase their prey, as well as avoid colliding with other insects in the air. Speaking of the predatory behavior of dragonflies, we must also mention their larvae, the larvae of dragonflies are flightless and live in water, but they are also a powerful predator.

Everyone praises dragonflies as beneficial insects, but their larvae are pests, and people call them "fish tigers" extremely harmful

The dragonfly flies in the air, but its larvae, on the contrary, must live in the water, and it is also particularly ferocious, and finally won the domineering title of "water tiger" and became a water tyrant!

The larvae of the dragonfly live in water, its scientific name is 水虿 (chài), which belongs to the order Dragonfly of the class Insecta, which is the name of the larvae of the dragonfly. Jing Hui Lu.

The body color of the water fly is generally dark green or dark brown, and it has no wings in the water and cannot reproduce. It's similar to the characteristics of the monkey, except that the monkey is hidden deep underground, and it becomes known after feathering.

Water flies will grow in the water for a long time in their lives, even the shortest, they have to grow in the water for two or three months, some need to grow for two or three years, and the longest one needs to grow for seven or eight years to fully mature.

Water flies grow in water for a long time, and it is not enough to drink water. But dragonflies like to eat meat (pests); Its larvae also love meat. Originally, its small body was also an "insect" that lived in the water, and it was reasonable that it should be eaten by fish.

However, it likes to lie in ambush under the silt or dead branches and leaves of streams or ponds, waiting for an opportunity to ambush small fish and shrimp that pass by it, and even tadpoles and other small insects in the water, and is a very fierce carnivore.

02 Hazards of water bugs.

The water fly especially loves to eat fish and shrimp, and its formation is often unavoidable, we often see the "sunny day water", in fact, it is a sunny day in the water to lay eggs, and its eggs hatch after the water is - water fly!

All water bugs often appear in areas with water, which is extremely harmful to aquaculture, and is extremely harmful to fish and shrimp seeds, causing great economic losses.

03Prevention and control of water bugs.

The water fly has a ferocious temperament, a water fly can eat 10 fish and shrimp of about 3 cm a day, and thousands of water fly are fatal to aquaculture. Therefore, if you want to breed fish fry, shrimp fry, etc., it is necessary to control the water bug.

You can use quicklime to clear the pond, and sprinkle 50 to 100 kg of quicklime per mu, which can effectively kill the water fly. At the same time, it can also be treated by light trapping and other methods.

04 Water is a delicacy.

The water fly is ferocious and abnormal, but it is not a threat to large fish, and it has also become a delicacy in the mouths of large carp, large grass carp, and large crucian carp. The water fly is just an insect that lives in the water, but it has not escaped the mouths of foodies.

It was also eaten, and it was a pity for the good people to throw away the large number of water flies trapped, and the gluttony of foodies eventually turned the water flies into a delicacy.

Dragonflies are beneficial insects, and they will help hail in rice fields to catch small late-attacking insects such as flies, mosquitoes, leafhoppers, and planthoppers to eat the bushes and protect crops.

Dragonflies are predatory source insects, and the objects of predation are basically pests that are harmful to hail and plums, such as butterflies, moths, flies, mosquitoes, locusts, etc. Therefore, dragonflies are natural enemy insects, insects that are beneficial to humans, and belong to beneficial insects

Dragonflies are beneficial insects, and dragonflies are an important class of natural enemy insects that are beneficial to humans.

Dragonflies generally prey on mosquitoes, midges and other small insects such as flies, bees, butterflies, moths, cicadas, etc., and some even fish. often male and female flocks, flying near water; After mating, females lay eggs in various environments, such as in water, aquatic weeds, and tree branches.

The dragonfly clicked on the surface of the lake for a while, and then flew to the shore to hunt the first mosquito on the shore, and soon, the mosquitoes were wiped out.

Composition: Yesterday afternoon when I came home from school, I did my homework first, and after I finished my homework, I went to the park next to my house to play alone. In the evening, the park is full of big dragonflies, like small planes flying in the air. Confusion.

I ran east and west, chasing dragonflies everywhere. I chased a pink dragonfly and fell to the ground, and I immediately caught it home.

When I got home, my mother asked me, "What did you do?" I said

Let's go catch dragonflies. I showed my mother the dragonfly I caught, and when my mother saw the dragonfly in my hand, she said to me kindly: "Dragonflies are beneficial insects, they eat mosquitoes and other harmful flying insects, they are good friends of human beings, and we should not harm them."

Listening to my mother's words, I lowered my head.

Later, I reluctantly released the dragonfly back into the sky. Seeing this beautiful dragonfly flying freely in the air, I was happy again, and I thought that the little dragonfly would be able to see its mother again.