pest which cause injury to human being are called
Answers
Answer:
no answer but explanation , remember its too long
Explanation:
Insects
Insects, as a class of animals, outnumber all other living animals on earth. There are three times as many insects as there are animals in the rest of the animal kingdom. Insects are found everywhere; in snow, water, air, soil, hot springs, and in or on plants and animals. They compete with man and animals for food and are also considered food for a significant number of other animals. Some insects survive solely by feeding on man, for example human lice, and cannot survive for long if removed from the human body. Insects are an extremely important part of the earth's ecosystem, and despite our dread of insects we could not survive without them.
The certified applicator controlling insects must be more knowledgeable of insects than the average person. Insects can be divided into three groups by their importance to man:
Species not considered pests. About 99 percent of all insect species are in this group. They are food for other animals (birds, fish, mammals, reptiles and other insects). Some insects, butterflies for example, are considered pleasant to look at.
Beneficial insects. This important group includes predators and parasites that feed on pest insects, mites, and weeds. Good examples are ladybird beetles (lady bugs) and praying mantids. Pollinating insects are also very important, such as honey bees, bumble bees, moths, butterflies, and beetles. Honey bees make food for humans and animals. Some other benefits derived from insects are silk from the cocoons of silkworms, or dyes for paints made from insect secretions.
Pest insects. This group includes the smallest number of species. These insects feed on, cause injury to, or transmit disease to humans, animals, plants, food, fiber, and structures. Some examples of pest insects are mosquitoes, fleas, termites, aphids, and beetles.
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Insect Body Characteristics
All adult insects have two characteristics in common; they have three pairs of jointed legs, and they have three body regions - the head, thorax, and abdomen.
Head. Attached to the insect head are the antennae, eyes, and mouthparts. All of these parts vary in size and shape, and can be helpful in identifying some pest insects.
Antennae are paired appendages usually located between or below the eyes. Antennae vary greatly in size and form and are used in classifying and identifying insects. Some of the common antennae types are:
filiform - threadlike; the segments are nearly uniform in size and shaped like a cylinder (ground beetle, cockroach).
moniliform - look like a string of beads; the segments are similar in size and round in shape (termites).
serrate - sawlike; the segments are more or less triangular (click beetle).
clubbed - segments increase in diameter away from the head (Japanese beetle).
plumose - feathery; most segments with whorls of long hair (male mosquito)
Mouthparts are different in various insect groups and are often used in classification and identification. The type of mouthpart determines how the insect feeds and what sort of damage it does. It is important that the applicator have some knowledge of the these types of insect mouth parts:
chewing mouthparts have toothed jaws that bite and tear the food (beetles, cockroaches, ants, caterpillars, and grasshoppers).
piercing-sucking mouthparts are usually long slender tubes that are forced into plant or animal tissue to suck out fluids or blood. (mosquitoes, aphids).
sponging mouthparts are tongue-like structures that have spongy tips to suck up liquids or food that can be made liquid by the insect's vomit (house flies, blow flies).
siphoning mouthparts are long tubes used for sucking nectar (butterflies, moths).
Thorax. The thorax, or middle body segment, has three pair of legs and sometimes one or two pair of wings (forewings, hindwings).