Although there are many types of insects in the field, it is rare to see a large number of pests in a single species, which is rampant alone. The reason is that insects are also divided into camps, and their populations are both fighting with each other and interdependent and mutually restrictive, forming a relatively balanced state. Today, Xiaobian will introduce you to the natural enemies of several crop pests, and everyone should pay attention when they see it, but don't mistakenly injure the "friendly army".
About predator insects
Insect pests are a major hidden danger that endangers the healthy growth of crops, mainly manifested in nibbling on plant organs, spreading viruses, and creating favorable conditions for the invasion of diseases.
However, among crop pests, the real harm is extremely great, causing economic losses all year round, and there are not many insects that need to be controlled frequently, accounting for only 1% of the total number of insects. In fact, each pest has several kinds, even dozens of species, hundreds of species of natural enemies in control of them, such as rice planthoppers, leafhoppers there are more than 200 kinds of natural enemies, which fully explains the abundance of natural enemy insect resources in nature.
The main species of predator insects
The species of natural enemy insects can be divided into predatory natural enemies and parasitic natural enemies according to their insecticide methods.
1
Predatory predators
There are many types of predatory predators, the most common of which are dragonflies, praying mantises, hunting bugs, stinging bugs, flower bugs, grasshoppers, ladybugs, walking insects, insectivorous flies, aphid flies, wasps, mud bees, spiders and predatory mites.
These predators generally prey on a large amount, and during their growth and development, it may take several, dozens, or even thousands of insects to complete their growth and development. According to the feeding method, it can be divided into chewing type and sucking type, etc., and the following are briefly introduced:
Praying mantis: It can prey on more than 40 kinds of pests, such as flies, mosquitoes, locusts, moths and butterflies and their larvae, bare pupae, crickets and other small insects, as well as cicadas, locusts, cockroaches and other large insects.
02
Predatory ladybirds: Feed on plants such as aphids, mesquiterats, whiteflies, leaf mites, etc.
03
Predatory mites: its range is very wide, including red mites, large red mites, velvet mites, long-whiskered mites and plant mites, etc., it is a kind of omnivorous mites with red spiders, rust ticks and other plant leaf mites as the main food.
04
Grasshopper: Can prey on a variety of pests. Such as whiteflies, red spiders, all kinds of aphids, in addition, it also likes to eat the eggs of many kinds of pests, such as cotton bollworms, ground tigers, silver-striped nocturnal moths, wheat moths and small bridge worms, etc., are within its food range.
05
Bugs: Insects of the family Flower Bugs, The Family Of Blind Bugs, and The Family of The Cockroaches can prey on pests such as leafhoppers, planthoppers, aphids, thrips, cotton leaf mites and cotton worm eggs.
06
Aphid-eating flies: The larvae prey on aphids and are effective natural enemies of pests such as aphids, mesozoans, whiteflies, leafhoppers, thrips, and lepidoptera larvae.
Parasitic predators
Parasitic natural enemies are insects that parasitize the body of pests, feeding on the body fluids or internal organs of pests, with parasitic bees and parasitic flies as the main representatives.
Red-eyed bees: As a class of tiny egg parasitic bees in the family Waspidae, they can parasitize the eggs of a variety of lepidopteran pests such as corn borers, armyworms, striped borers, cotton bollworms, twill nocturnal moths and ground tigers.
Cocoon bees: parasitize a variety of moth and butterfly larvae, which play a certain role in controlling their occurrence.
Parasitic flies: Most of the larvae of Lepidoptera and leaf beetle insects can be parasitic, in addition to the larvae of the celestial bull and wood beetle moth that live in the stem of the plant, the scarab beetle larvae living in the soil, and adult insects such as beetles and bugs.
Exploitation of predatory insects
1. Awareness
The use of natural enemies insects for biological control must select excellent natural enemies, that is to say, to select a dominant species that play a larger role in an area or community.
The conditions that a good natural enemy must have are: strong ability to find a host; match or closely match the life history, generation number and number of hosts of the host; strong diffusion ability; strong adaptability to the environment; strong selectivity of the host; easy to multiply.
2. Protection
After the pest lives in an area for a long time, it is bound to be accompanied by a certain species and number of natural enemies. However, due to the limitations of various living conditions, the number of natural enemies is often insufficient to control pest damage. At this time, appropriate measures can be taken, such as protecting natural enemies from overwintering safely; rational use of chemical pesticides; avoiding harm to natural enemies, and promoting the reproduction of natural enemies to control the occurrence and harm of pests.
3. Release
Natural enemy insects and their host or preying on them in nature often follow, not only with a lag in time, but also in numbers much lower than pests. At this time, artificial breeding or direct purchase of the corresponding products can be considered to release pests into the field when the pests first appear.
There are more than just pests in the fields
There are also beneficial insects
Remember to distinguish between good and bad when preventing insect pests
Source: Voice of the Countryside of China
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