What is the growth stage of grasshoppers?

Grasshoppers are also called grasshoppers, grasshoppers, grasshoppers, grasshoppers. Insects of Acridoidea and Tettigonidae. Habitat in various places, mostly in low-lying areas of tropical forests, semi-arid areas and grasslands. The tentacles of the head, the tentacles of the abdomen, the whiskers of the tail and the receptors on the legs can all feel the touch. The taste organ is in the mouth, and the smell organ is on the antenna. There is tympanic membrane hearing on both sides of the first abdominal segment or at the base of the tibial muscle segment of the forefoot. Compound eyes have vision and single eyes are sensitive. Plant-eating, a few species are important pests of crops. The hind legs are thick and suitable for jumping. Male insects make sounds by rubbing the left and right wings or rubbing the convex veins of the front wings with the sound file of the hind leg joint. Some species can also pronounce when flying. Some habitats are unique, such as Marellia remipes in South America, who lives on floating plants for most of her life, can swim and lay eggs on aquatic plants. Grasshoppers are generally larger, and some species (such as [〔Tropidacris latriellei〕] in South America) are more than 1 1 cm in length. Some areas feed on locusts. Natural enemies are birds, frogs and snakes. Features: usually green, brown or black, with large head and short tentacles; The front chest backboard is hard, extending to the left and right like a saddle, and the middle chest and the back chest can't move when they heal. With developed feet, especially muscular hind legs and hard exoskeleton, he is an expert in jumping. The tibia has a sharp saw and is an effective defensive weapon. The ovipositor has no obvious protrusion, which is the biggest difference from the owl. In addition to the antenna, the head of the locust of Acridoidea has a pair of compound eyes, and the antenna is the main visual organ. There are three monocular eyes at the same time, which can only be sensitive. There are mouthparts under the head, which are the feeding organs of locusts. The mouthparts of grasshoppers are composed of upper lip (1 piece), upper jaw (1 piece), tongue (1 piece), lower jaw (1 piece) and lower lip (1 piece). Its upper jaw is hard and suitable for chewing, so this mouthpiece is called chewing mouthpiece. On both sides of the first section of the abdomen of locusts, there are a pair of half-moon membranes, which are the auditory organs of locusts. A row of small holes arranged neatly on the left and right sides is the valve. From the middle chest to the eighth abdominal segment, each segment has a pair of valves, with a total of 10 pairs. Each valve communicates inward with the trachea (below). Grasshoppers have trachea with different thickness, which branches again and again, and finally contact with each cell with tiny branches to breathe. Therefore, the valve is the gateway for gas to enter and leave the locust body. Feeding habits: I like to eat thick leaves, such as sweet potatoes and water spinach. Abnormal condition: incomplete abnormal condition. Insecta, Arthropoda, Animal Kingdom. After mating, the female locust inserts the oviposition tube into the soil with a depth of 10cm, and lays about 50 eggs. When laying eggs, the female will secrete white material to form a cylindrical plug, and then lay eggs. The development process of locusts is rather complicated (II). Its life begins with a fertilized egg. The larvae just hatched from eggs have no wings and can jump, which is called jumping insects. The flea is similar in shape and living habits to adults, but smaller in size and immature in reproductive organs, so it is also called nymph. If an insect grows up gradually, it will shed its original exoskeleton when it is restricted by the exoskeleton and can no longer grow up. This is called molting. Nymphs molt five times in their lives. From hatching to molting for the first time, the age is 1, and every molting thereafter, the age increases 1. After the 3rd instar, the wing buds are remarkable. Become a flying adult after 5 years old. It can be seen that the individual development process of locusts goes through three stages: egg, nymph and adult. A developmental process like this is called incomplete metamorphosis. When an insect develops from a fertilized egg to an adult, it can produce the whole individual development history of its offspring, which is called the first generation. Locusts can produce two generations of summer locusts and autumn locusts a year in some parts of China, so there are two generations. This is an egg that has been developed for 19 days; At about 24℃, locust eggs can hatch in about 2 1 day. The hatched nymph crawls out of the soil. At this time, its appearance is very similar to that of adults, except that it has no wings and its body color is lighter. Larvae looks more like adults in the first year or two, but the head is out of proportion to the body. Winged buds grow at the third age, which is obvious at the fourth age. When the nymph is five years old, it will climb to the plant and hang for a while, and then the adult will come out. Morphology and living habits: both adults and larvae of locusts can chew the stems and leaves of plants with developed chewing mouthparts. Locusts are good at flying and jumping, and a pair of tentacles in the head are organs that combine smell and touch. Its chewing mouthparts have a pair of developed jaws with teeth, which can bite off the stems and leaves of plants. Its hind foot is very strong, and it mainly depends on it when jumping. When locusts fly, their hind wings play a major role, and when they rest, their front wings cover their rear wings for protection. Female insects have a strong "ovipositor" at the end of the abdomen, which can be inserted into the soil to lay eggs. Grasshopper spawning sites are mostly wet river banks, lakes, foothills and ridges. Every 30 to 60 eggs are grouped together. Immature locusts hatched from eggs are called "locusts" and need to molt five times to develop into adults. A large number of eggs can be hatched after the rain clears. Locusts also have amazing flying ability, which can fly continuously 1~3 days. When locusts fly by, the sound of swarms of locusts flapping their wings is amazing, just like the roar of a storm in the ocean. Adult hind limbs and legs have a series of mastoid processes equivalent to elastic devices, and the base of radial veins of anterior wings has thick veins equivalent to chordal devices. When they rub, the vibrating area of the vibrating wing can make sound, which is their sounder. The auditory organs of locusts are also very special, located on the side of the first abdominal segment. Grasshoppers are commonly known as "grasshoppers" and Taiwan Province people call them "grasshoppers". Their life history is egg → nymph (larva) → adult, which belongs to incomplete metamorphosis. Chewing mouthparts are herbivorous insects. Most of them are not picky eaters. In weeds, they can often be seen eating the leaves of Gramineae plants. Its tentacles are not as long as those of the owl, and it is a short whip, but its hind legs are strong and it can avoid natural enemies by bouncing. Sometimes you can see wedding photos of two locusts.

Appearance characteristics of Oxya chinensis: the body length is 265,438+0 ~ 365,438+0 mm, and the male is 24 ~ 39 mm. The back is grayish brown, the abdomen is green, and the body color is quite different, which will be similar to the habitat and form a protective color. Ecological habit: Oxytropis Oxytropis is a very common locust in flat land and low altitude areas, which can occur for two generations a year. The reason why locusts move in groups is mainly because they need high temperature to stay together for warmth. Adult hind limbs and legs have a series of mastoid processes equivalent to elastic devices, and the base of radial veins of anterior wings has thick veins equivalent to chordal devices. When they rub, the vibrating area of the vibrating wings can make sound, which is their sounder. The auditory organs of locusts are also very special, located on the side of the first abdominal segment. According to the living habits of locusts, they can be divided into migratory and non-migratory types. These two kinds of locusts are very threatening to crops, especially the former is very destructive. As long as they cross the border, all green plants will be eaten up. The shock caused by the plague of locusts is really flattering. Its diet is very diverse, eating all kinds of green plants, especially Gramineae plants. Nymphs (larvae), also known as locusts, are similar in appearance to adults, but only have wing buds and are good at jumping. After four or seven skinning, they will become adults who are good at jumping and flying. Some locusts have short antennae and short ovipositor tubes. At present, there are about 5000 kinds of locusts in the world. The longest part of a locust's body is its hind foot, which is almost the same as its body length. It can jump out of its body eight times as long in one jump. The hind foot of a locust is also its best musical instrument, and it can make a sound by rubbing its wings. Classification: All insects belonging to Acridoidea in Orthoptera. Type; There are about 12000 species in the world, and there are more than 100 species in Taiwan Bay. Life history; Egg → nymph (larva) → adult. Ecological characteristics: commonly known as grasshopper, Taiwan Province people call it grasshopper. There is a folk song "Cao Meng Teases the Rooster", and the lyrics depict the scene of this little insect and the rooster teasing each other, which is a common picture in the early rural areas of Taiwan Province. Locust crossing the border is a familiar idiom. Feeding habits: herbivorous insects, mostly not particularly picky eaters. Substitution: Oxytropis, accustomed to inhabiting wet and bare ground, mainly feeds on bryophytes. Habitat environment and protective color: the machine has a typical protective color and has excellent stealth effect in the grass. The hind feet are strong and developed, and they are good at bouncing. In times of crisis, this is their usual means to avoid the enemy. Mating behavior; Compared with other insects, it takes a long time to mate, so it is not uncommon to see pictures of husband and wife files.

1. Agricultural prevention and control (1) Build water conservancy to ensure drought and flood. (2) Reclaim wasteland in a large area, change locust habitat and reduce the area of occurrence base. (3) Planting trees to change the microclimate in locust areas and reduce the suitable places for locust spawning and reproduction. (4) Improve cultivation techniques to control locust eggs, adjust measures to local conditions, change crop layout and reduce locust harm. Biological control (1) In locust-infested areas, agricultural and biological pesticides with high efficiency and low toxicity are used to protect predatory natural enemies in locust-infested areas. ⑵ Microsporidia was applied in a large area.

1. Selection and identification of breeding locust provenance The methods to determine locust species are: (1) Consult locust classification experts. (2) refer to the locust key table or atlas. ⑶ Consult an experienced locust farmer. (4) Send the locust species to customers for identification and review. Common species of cultivated locusts are: oriental migratory locust, cotton locust, Chinese rice locust, Chinese grasshopper and so on. These varieties have their own advantages and disadvantages, so it is necessary to comprehensively consider their growth cycle, algebra, taste, food, size, varieties needed by customers and other factors, and select breeding varieties in combination with local climate and food sources. The second is the construction of locust breeding shed and the layout of shed land. Before building the shed, the ants and crickets on the ground should be wiped out. You can use capture, trapping, boiling water and other methods. The above insects are natural enemies of locusts, which can prey on locusts and destroy their eggs, so these animals must not exist in the shed. In order to facilitate drainage in rainy season, the ground in the shed should be 10- 15 cm higher than the ground, and sandy loam is the best soil, which is not easy to agglomerate and convenient for laying eggs and taking eggs. In mid-April, crops such as wheat can be planted on the ground where the shed is built for young locusts to eat. The building area of the shed is determined according to the number of locusts to be raised. Raising ten thousand locusts requires 15 square meters. You can use the free places inside and outside the courtyard to build scaffolding with iron wires, wooden sticks and bamboo pieces. According to your own conditions, and then according to the size of the scaffolding, make a tent cover like a mosquito net with rib cloth (screen), hang it on the scaffolding, bury the bottom edge in the ground, leave the door and install a zipper at the door. This device is designed to prevent locusts from escaping and facilitate feeding and management. (Arch shed can also be built) The shed height is only1.5-2m. In order to keep warm and rain-proof, plastic sheets can be covered outside the shed. When the temperature is high and the locusts are old and not afraid of rain, plastic sheets can be left uncovered. If natural conditions are used to breed migratory locusts, the shed construction must be completed before the end of April, and it is appropriate to choose a sunny place. Third, the management of the nymph period (1) Locusts eat less and like to feed on fresh and tender plants. The locusts at this stage are very delicate, so we should pay attention to rain protection to prevent locusts from drowning. ⑵ The temperature is controlled at 25-30℃, the illumination is above 12 hours, and the humidity is kept at about 15%. Under this condition, locusts are the most active and like to eat, which is conducive to growth. (3) The food intake of locusts over three years old is gradually increasing. At this time, it is necessary to ensure that there is enough food in the shed, otherwise it will affect its normal growth and lead to cannibalism. (4) Keep the shed clean and clean it every 1-2 days to prevent diseases. 4. Locust is a disastrous insect, which is different from other special aquaculture. Breeding it can turn harm into treasure and increase farmers' income, on the other hand, it can increase the number of locusts and form potential harm. It is necessary to take necessary safety management measures for its breeding in order to achieve twice the result with half the effort. For large-scale farming, according to the standard of 1 mu, a plant infection isolation belt with a width of half a meter should be built around the farm, surrounded by barbed wire fences and pesticide sprayers. There are many kinds of pesticides that kill locusts, and 75% malathion EC or 2.5% pyrethroid can kill them. If farmers don't want to breed locusts, they should take the last extermination measures. Farmers don't want to breed, so they should make preparations in advance. They can't dismantle the anti-breeding shed before May 20th every spring. After all the locusts are unearthed, they should be killed with pesticides before the adults, so there will be no harm. Before the end of autumn, farmers decided not to breed any more. They must sell all the locusts or kill them with pesticides before September 10, that is, before they mate, and they are not allowed to lay eggs in the breeding shed. This measure can ensure the elimination of potential hazards in the future and is conducive to the healthy development of locust breeding industry.

Biological characteristics and value of locusts: locusts are insects with the same origin of medicine and food, which are oviparous and belong to Orthoptera and Acridoidea. According to statistics, there are 859 species of grasshoppers in Acridoidea. There are mainly two kinds of edible herbs, namely, Locusta migratoria manilensis and Oxya chinensis. These two kinds of grasshoppers are nutritious, tender and delicious like shrimp. According to the study on the feeding value of Locust and Locust, Locust is rich in protein, carbohydrates, insect hormones and other active substances, and contains vitamins A, B and C. Compendium of Materia Medica records that Locust can treat many diseases, such as tetanus, convulsion, fever, asthma, abdominal distension, plague, chilblain, tracheitis and prevention of cardiovascular and cerebrovascular diseases. Take ten pieces of decoction, or stir-fry and grind into powder, five pieces each time, stir-fry and grind sesame oil for chilblain and the affected area. With the development of society and the continuous improvement of the quality of life, human dining tables have changed from traditional types such as chicken, duck and fish to green game types. Grasshoppers are nutritious, tender and delicious like shrimp. They have the reputation of "flying shrimp" in Hong Kong and other places, and are the favorite foods of people all over the world. In the United States, people hold "insect banquets" to entertain distinguished guests, including locusts. It is reported that at present, some patients with obesity, hypertension and cardiovascular and cerebrovascular diseases tend to eat insects in order to lose weight and get rid of diseases. Subsequently, some countries and regions also improved insect food accordingly. Cooking with insects, or making canned food, biscuits, ice cream and other foods are very popular.

It is a metaphor for those who eat the fruits of collective labor and don't work by themselves, because locusts are pests that erode crops, and it is the best metaphor for those who get something for nothing and enjoy success. The metaphor is a rush, just like the locust economy now.