What are the harmful symptoms of rice and rose thrips? How to prevent and cure it? What kind of medicine do you use?

Thrips are the general name of Thysanoptera. Larvae are white, yellow, or orange, adults are yellow, brown, or black; feed on plant juices or fungi. Rice and rose thrips are the most common, so what are its harmful symptoms? How to prevent and cure it? What kind of medicine should I use? Let's take a look at it.

What are the harmful symptoms of rice and rose thrips?

I. Rice

Rice thrips belong to Coleoptera and have file-sucking mouthparts. When doing harm, use mouthparts to pierce the young parts such as rice leaves and spikelets, and suck the sap from the rice plant. Yellow and white spots or micropores appeared on the injured leaves, and then the leaf tips gradually curled and withered yellow. in severe cases, they could make the seedlings yellow and red, as if they had been burned. When the rice seedlings are seriously damaged, the rice plants turn green and the growth of tillers is blocked, and the rice seedlings sit in the pocket. The spikelet development was affected by the damage at booting stage, and only the white filamentous glume was extracted. Entering the glume at flowering stage is harmful to the ovary, destroying the floral apparatus and forming a shrunken grain or shell.

Second, rose

The old leaves lost green, the new leaves curled, the tender bud withered, and the hand felt as if it had been baked dry. There are spots and even deformations on the pole. The petals lose water and show an unclean state. The leaves harmed by thrips become smaller, harder and brittle.

How to control rice and Chinese rose thrips?

I. Rice

1. Weeding and insect control. Remove weeds and litter on the edge of the field to reduce the overwintering sites and important food sources of rice thrips. This is an effective measure to solve the initial infestation of rice thrips. When using pesticides to control rice thrips, we should also spray weeds near the rice fields.

2. Rational distribution of rice varieties. Rice thrips have occurred for a long time, so if the layout of rice varieties is unreasonable, rice thrips can be planted in different rice fields if the rice varieties are planted in flower arrangement with different varieties and maturity stages. Therefore, rice thrips should be planted in the same type and the same variety in rice fields.

3. Protect natural enemies. In addition to pests in rice fields, there are many natural enemies that can prey on thrips, such as spiders, bugs, ladybugs, etc., which have a certain inhibitory effect on the number of thrips. When spraying to control rice pests, natural enemies should be applied reasonably to protect natural enemies. In order to give full play to the role of natural enemies in controlling pests.

Second, rose

1. According to the characteristics of thrips lying in the daytime and coming out at night, it is recommended to take medicine in the afternoon.

2. Thrips have strong concealment, so it is necessary to choose internal absorption or organosilicon auxiliaries, and try to choose agents with long effective period.

3. If the conditions permit, the combination of chemical fumigation shed and foliar spray is suggested.

4. Take precautions in advance and don't wait for flooding before taking medicine.

What kind of medicine do rice and rose thrips use?

I. Rice

In general, the leaf curling rate in the seedling field reaches 5%, and the number of 100 plants reaches 100,200; the Honda leaf curling rate reaches 10%, and when the number of 100 plants reaches 200,300, it is the appropriate time for application, and it should be applied as soon as possible. The medicament can be selected as 10% enamiprid water agent, 1% methamectin benzoate EC, 10% imidacloprid wettable powder, 20% acetamiprid soluble powder and so on. In addition, after the damage to rice, the growth is weak, and appropriate fertilization can be carried out according to the actual situation.

Second, rose

For example, Xiuxiu, permethrin, Aktai, etc., or choose the right insecticide according to the symptoms, in addition, it is best to choose a dark side late spray, at least twice a week.