What are the living habits of thrips?

Thrips occur all year round. Spring, summer and autumn mainly occur in the open field, and in winter it is mainly in greenhouses, harming eggplant, cucumber, kidney bean, pepper, watermelon and other crops. The peak occurs in autumn or winter from November to December, and March to May is the second peak period.

Female adults mainly undergo parthenogenesis, with occasional hermaphroditism, and it is extremely difficult to see males. The eggs are scattered in the mesophyll tissue, and each female lays 22 35 eggs. Female adults live for 8-10 days.

The egg stage is 6 to 7 days in 5-6 months. The nymphs feed on the dorsal leaves and stop feeding at the end of the advanced indolescence and fall into the topsoil to pupate. Thrips prefer warm, arid weather, its suitable temperature is 23 28, suitable air humidity is 40% 70%; The humidity is too high to survive, and when the humidity reaches 100% and the temperature reaches 31, all the nymphs die.

In the rainy season, if it is cloudy and rainy, water accumulates between the axils of the leaves of the onions, which can lead to the death of nymphs. After heavy rain or watering, the soil is compacted, so that nymphs cannot enter the soil to pupate and pupae cannot hatch into adults.

Different species of thrips also lay different eggs:

Melon thrips, also known as palm thrips and brown and yellow thrips, mainly harm gourd, winter melon, watermelon, bitter gourd, tomato, eggplant and leguminous vegetables. Female adults mainly reproduce parthenogenesis, but occasionally reproduce hermaphroditism; The eggs are scattered in the mesophyll tissue, and each female lays 22 35 eggs.

Allium thrips: usually hermaphroditic, females can also be parthenogenesis, females pierce into the leaves with ovipositors to lay eggs, one at a time, each female can lay dozens of eggs to nearly 100 eggs.

Rice thrips: Male insects are rare, mainly parthenogenesis. The eggs are scattered in the subepidermal tissue between the veins on the front of the leaf, and the oviposition is visible to the light as a small transparent dot the size of a pinpoint.

Thrips is a general term for the insect class Tasseloptera. It is widely distributed and can be found all over the world. The feeding habits are also very mixed, including herbivorous, predatory and fungivorous, among which the herbivorous is the most, accounting for more than half of the total, which is one of the important economic pests.

Its larvae are white, yellow or orange, and adults are yellow, black or brown. It is small in size and not easy to detect.

Thrips are actually about the size of an aphid, no more than two or three millimeters long. Its main food is plant juice, so it is considered a pest in agricultural production. In addition to a large number of spring and summer stalls, in the winter farmers' greenhouses, there will also be traces of thrips, it imitates the file is very harmful to crops, and does not need males, female thrips can have the next generation.

Thrips hate rainy weather and prefer to live in warm and dry air.

Thrips hazards and protection

Thrips are mainly harmful to plants, more phytophagous, will suck the juice of plant epidermal tissue, which can cause plant wilting, leaf drying, will cause grain shriveling, which will affect the quality and reduce the yield. However, it is not toxic to the human body, even if it is bitten, as long as it is disinfected regularly, it will not harm health.

In addition to harming crops, thrips can also be very uncomfortable. Thrips have wings when they mature and have a natural sensitivity to green and yellow things. Therefore, people wearing green and yellow clothes on the street will inevitably be targeted by thrips, and sometimes there can even be dozens or hundreds of stupid friends, which looks like they are about to commit a phobia.

Thrips are more harmful to plants and crops, and measures should be taken to treat them as soon as possible when they are found. You can choose to spray drugs, and the specific drugs are imidacloprid and acetamiprid, which can be sprayed in turns, and the effect is better. It is also necessary to change the maintenance environment, strengthen ventilation at ordinary times, and avoid aggravating the phenomenon of insect pests.

In addition, it can also be used to control its bluish habit, and set up a blue sticky board in the place where it is often active, so that it can also trap and kill adult insects.

The above content reference: Encyclopedia - Thrips.

Thrips use file-sucking mouthparts to harm the leaves, buds, flowers and other parts of flowers. The young leaves are spotted, curled and even dead after being killed. After the growth point is damaged, it turns yellow and withers, resulting in the terminal bud can not continue to grow and flower.

Thrips are often harmful to orchids in potted flowers, and the buds of the damaged orchids have black spots, shriveled, and fall off, and the leaves of the orchids have rust spots with a brown-yellow surface and a length of about 1 cm. Thrips are also often mainly harmed by ficus microphylla and weeping ficus, and bonsai ficus trees are more seriously damaged. The young leaves and young shoots of the banyan tree form reddish-brown spots of different sizes, the bud tips wither, and the leaves fold along the midrib to the front, forming a dumpling-like gall.

In severe cases, the young leaves of the whole banyan tree form galls, which seriously affects the ornamental nature of the banyan tree. The adult is about a millimeter long and has a pale yellow to dark brown body color. Six legs, one pair of antennae, two pairs of pinnate wings, good flying, file-sucking mouthparts.

Egg kidney-shaped, yellowish, translucent. There are 4 instars in the nymph stage, the 1st instar nymph is white and transparent, the 2nd instar nymph is light yellow to dark yellow, the compound eyes are brown, the 3rd instar nymph antennae are divided to both sides, the wing buds are beginning, the 4th instar nymph is light brown, the antennae are turned back, and the wing buds extend to the abdominal abdominal segment. Adult thrips are active, most of them are herbivorous, and they are important pests of flowers, and they are also fungivorous.

Adults are afraid of light, and hide during the day, and move to feed on leaves, young shoots, and flowers in the morning, dusk, and cloudy days. Thrips reproduce in large quantities, occurring more than 15 generations a year. The suitable temperature for thrips development and reproduction is 10 30, and the optimal temperature is 15 25.

Under the conditions of high temperature and drought, the adults lay fewer eggs, the hatching rate is low, and the mortality rate of the first hatched nymphs is high. Therefore, the damage of thrips is the most serious in March and April, the number of insects in July and August decreases sharply due to high temperature, and the damage is weakened in September and October.