CATDOLL : CATDOLL: From which month to which month does the locust growth cycle last?

1. From which month to which month does the locust growth cycle last?

The number of generations that occur in a year depends on the biological characteristics of the species and the annual effective accumulated temperature, food, light, and growth and development of each insect stage in different regions. For example, the Asian migratory locust has one generation a year in the distribution area of ​​my country. The East Asian migratory locust has two generations in the middle and lower reaches of the Yangtze River and its northern distribution areas, while in the high temperature and drought years of the Yangtze and Huaihe River basins, it has three generations or incomplete three generations; it has four to five generations in South China. The Chinese rice locust has one generation in the Yangtze River and its northern distribution areas, and two generations in the south of the Yangtze River.

2. What three developmental stages do locusts generally go through?

It goes through three stages: egg, nymph and adult, which is an incomplete metamorphosis.

There are two types of metamorphosis: incomplete metamorphosis and complete metamorphosis

3. The development process of locusts goes through three stages: egg, nymph and adult. This development process is called ______ development

Incomplete metamorphosis refers to the process of going through three stages: fertilized egg, larva, and adult, and the larva and adult are not much different. For example, locusts, crickets, grasshoppers, etc. belong to incomplete metamorphosis;

Complete metamorphosis refers to the process of going through four stages: fertilized egg, larva, pupa, and adult, and the difference between larvae and adults is quite obvious. For example, fruit flies, bees, and cabbage butterflies all undergo complete metamorphosis.

So the answer is: Incomplete metamorphosis

4. The growth and development process of mosquitoes and locusts

Basic Situation

Mosquitoes are one of the four pests. Their average life span is not long, 3-100 days for females and 10-20 days for males.

Mosquitoes are divided into male and female. The antennae of male mosquitoes are thread-like and the antennae are generally denser than those of female mosquitoes. Their food is nectar and plant juice. The mouthparts of male mosquitoes are degenerate. Female mosquitoes need to bite animals to suck blood to promote the maturation of eggs before reproduction.

Mosquitoes have a substance in their saliva that can dilate blood vessels and prevent blood coagulation, making it easier for blood to flow to the bite site. The substance in mosquito saliva can cause the skin of the bitten person to swell and itch.

Each time a mosquito bites, it sucks about one five thousandth of a milliliter of blood. After each meal, the mosquito usually moves within 2 kilometers of its birthplace, but the maximum range can be up to 180 kilometers.

Each female mosquito lays about 1,000 to 3,000 eggs in her lifetime. They usually lay their eggs on the water surface, which hatch into aquatic larvae two days later. The larvae feed on algae in the water. They shed their skin four times before growing into pupae, floating on the water surface. Eventually, the pupae's skin breaks and the larvae are born.

The life cycle of mosquitoes includes four parts: egg, larva, pupa and adult. Generally, the egg stage is 1-2 days, the larval stage is 5-7 days, the pupa stage is 2-3 days, and the adult stage from emergence to sucking blood and laying eggs is 3-7 days. The entire generation is about 1-2 weeks.

Mosquitoes are insects that undergo complete metamorphosis. Their life cycle can be divided into four stages:

1. Eggs:

Mosquito eggs can be laid on the water surface, near the water or in the water, depending on the species. The eggs of Anopheles and House mosquitoes are laid on the water surface, while those of Aedes are laid near the water. Anopheles and House mosquitoes hatch in about two days, while Aedes eggs hatch in three to five days.

2. Larvae:

The larvae of mosquitoes are called mosquito larvae. They breathe through a straw. They have a slender body and are dark brown in color. They swim vertically up and down in the water, feed on bacteria and unicellular algae in the water, and breathe air. For example, the mosquito larvae of Culex mosquitoes have a long breathing tube at the end of their tail, with the end of the tube as the opening of the respiratory organ. When breathing, their bodies are at an angle to the water surface, making the breathing tube perpendicular to the water surface, and they eat organic matter and microorganisms. The bristles in their mouths will generate water flow to their mouths. Anopheles mosquitoes have no breathing tube, and the respiratory organ at the end of their tail opens on the body surface. When breathing, their bodies are parallel to the water surface.

After this period lasts for 10 to 14 days, the mosquito larvae will develop into pupae after molting four times, and then emerge from pupae into adult mosquitoes.

3. Pupa:

mosquito

The pupa looks like a comma from the side. It does not eat, but can swim in the water. It breathes through the first pair of respiratory horns. It matures in two days.

4. Adult:

Newly born mosquitoes cannot take off (emerge) until their wings are hard. Within 24 hours after emerging, the eighth abdominal segment of male mosquitoes will all turn 180 degrees to complete the mating posture. The mating movements vary according to the species. Some will form mosquito columns in the vast fields at dusk for group dance. Mosquito columns are not necessarily formed by a single type of male mosquitoes, but are often composed of several different mosquito species. At this time, female mosquitoes see the group dance and fly close to the mosquito column to mate with male mosquitoes of the same species before leaving. Mating usually takes 10-25 seconds. Female mosquitoes only mate once in their lifetime. After mating, the fluid secreted by the male accessory gland forms a mating plug in the female mating hole, but it gradually dissolves and disappears completely after about 24 hours. They only mate once in their lifetime, and the eggs they lay in their lifetime (more than 100 days later) can still be fertilized.