When is the control time of rice stem borer? what is the difference between rice stem borer and rice stem borer?

Rice is a kind of food that we are most familiar with. At present, it is distributed in many parts of our country, and the cultivation of rice is also a popular phenomenon. However, when planting rice, there are many things to pay attention to, such as the common pests of rice stem borer and rice stem borer, but is there any difference between them?

When is the control time of rice stem borer, Chilo suppressalis?

The best control time of rice stem borer (Chilo suppressalis) should be determined by pest situation and seedling condition. The control of withered seedlings is mainly caused by insect conditions, that is, the peak period of egg block hatching, and the second day of blackening at the bottom of 50% egg blocks, which is the best time to control withered heart seedlings; the prevention and control of white ears should be mainly based on seedling conditions, that is, during the appropriate period of control, the growth period of rice can reach the stage of breaking and heading, which is the best time to control white ears. Due to the different rates of action of various pesticides, biological pesticides should be applied appropriately in advance.

What is the difference between rice stem borer and Chilo suppressalis

The main results are as follows: 1. The shape of Chilo suppressalis is larger than that of Chilo suppressalis, the front wing is nearly rectangular, the hind wing is white, there are seven small black spots on the outer edge, and there is an indistinct black spot in the lower corner of the stem borer.

2. There are 5 dark brown vertical lines on the back of Chilo suppressalis larvae. The head of Chilo suppressalis is black in the early stage of the first instar, and the chest and abdomen are light black.

3. Chilo suppressalis is flat and oval, and the egg mass is irregularly arranged in the shape of fish scale. The egg mass of Chilo suppressalis has three layers, shaped like half a soybean.

4. At the seedling and tillering stage, the eggs are laid on the leaf front from the leaf tip 3--7CM, and at the late tillering stage, on the leaf sheath above 6CM above the surface of the leaf. The eggs of Chilo suppressalis are mostly laid on the leaves and then on the leaf sheaths. In the seedlings and tillering rice plants, the egg blocks are mostly near the leaf tip, located in the middle of the leaf surface, in the middle and later stages of Honda, 80% of the eggs are laid on the side of the abaxial midvein in the middle of the leaves, and rarely lay eggs after heading. It is only produced on green sword leaves.

5. The ability of Chilo suppressalis to invade rice is stronger than that of Chilo suppressalis, and its invasion is higher in round stem stage, and it can also infect rice in heading and mature stage.

Damage characteristics of rice stem borer, Chilo suppressalis

The serious damage of Chilo suppressalis has shown an upward trend in recent years, and the reasons are various. The larvae of rice stem borer (Chilo suppressalis) gnawed on the heart leaves at the seedling stage and tillering stage, and the heart leaves were damaged or rolled vertically, slightly faded or bluish white, similar to onion tubes in shape, which was called false withered heart, and the curled heart leaves were pulled out, so that the section was neat and more larvae could be seen. after the growth point was destroyed, the false withered heart turned yellow and died into withered heart seedlings, and the other leaves were still turquoise. The damaged rice plant has a small hole, there is no insect dung outside the hole, and there are white fine-grained insect dung in the stem. Different from the withered heart seedlings caused by Chilo suppressalis and Chilo suppressalis.

Agricultural control of rice stem borer, Chilo suppressalis

1. Properly adjust the layout of rice to avoid mixed planting and reduce bridge fields.

2. Select the varieties with moderate growth period.

3. Timely spring ploughing and retting field, dealing with rice stubble and reducing overwintering insect population.

4. The paddy field or dry land with no borer damage or light borer damage is selected as the green manure field. Due to the late spring ploughing, most of the larvae have pupated and emerged before ploughing, and attention should be paid to put an end to the source of insects in production.

5. Irrigating horse water in winter cropping field and green manure field is not only beneficial to crop growth, but also can kill most overwintering borer.

6. Timely spring ploughing and irrigation can drown the overwintering larvae and pupae by submerging rice stubble for 10 days.

7. Cultivate and control borer. To adjust the seedling planting period, the seedling throwing method is adopted to stagger the growth stage which is vulnerable to ant borer and the incubation period of ant borer, so as to avoid or reduce the damage.

In fact, as long as we know about rice stem borer and rice stem borer, it is good to distinguish them. Rice stem borer in the control must pay attention to the time, in addition to timely control, peacetime prevention is also very important. Only by doing these well can we ensure that rice can grow better.