What are the countermeasures when lentils grown in greenhouses encounter pests and diseases?

Lentil brown spot disease. Harmful symptoms: Lentil brown spot disease mainly targets the leaves.

If the leaves are infected with the disease, the leaves will show lesions of varying sizes。Usually, the lesions are not too large, but some of them are larger, dark purplish-brown in color, and will appear in the later and middle stages of the disease. Grayish-brown, perforated and cracked.

When the humidity in the field is high, a layer of gray-black mold will appear on the lesions. Black mold is the seed of the disease. If you are serious about farming in the field, then next year you will need to plant other crops, apply fertilizer wisely, pay attention to drainage, and reduce the humidity in the field.

It must be noted that after harvesting lentils, the seedlings should be cleaned up in a timely manner to destroy the seedlings of pathogens and consolidate the land in order to reduce the number of pathogens. Chemical control: The drug can choose 800 times the liquid of 50 metronidazole wettable powder, once every 7 to 10 days, 2 to 3 times in a row.

Lentil rust. Occurrence characteristics: lentil rust mainly damages leaves.

When the leaves are damaged, small yellow and white spots form that protrude slightly and then gradually expand to reveal rusty brown protruding spots。The precipitating factors are high temperature and humidity. Usually, the disease occurs from July to August.

Heyday prevention method: 500 times the solution of 65 zinc wettable powder can be used.

Lentil stalk blight. Symptoms of the disease: mainly damage the stem.

In the early stages of the disease, gray streaks or irregular spots appear on the surface of the stem, and when the lesions extend more than two-thirds of the thickness of the stem, the plant usually wilts in the afternoon, and when the diseased site spreads around the stem, it can recover sooner or later. Later, the diseased area may be above the diseased area, otherwise the whole plant will die, and the diseased area will turn grayish-white to dark gray, and many small black spots will grow on the surface. Chemical control:

For lentil wilt, use drugs that are effective against imperfect bacteria, such as mancozeb, promethazine, etc., add 50 kg of water per mu, spray every 7 days, control 2 to 3 times continuously, and stop taking the medicine 3 days before harvesting. When cleaning the diseased area, bury the affected area in a centralized, deep, or uniform treatment to reduce bacteria**. Increasing the application of potassium fertilizer during the growing period of lentils can enhance the plant's resistance to disease.

Anthrax. Anthrax can occur in both seedling and adult plants. Disease spots appear on cotyledons at seedling stage.

Control methods: Disinfect seeds and soil before sowing, avoid continuous sowing, and rotate with non-leguminous crops for more than two years. Strengthen field management, clean up and burn diseased plants in time when they are found, go deep into the soil to prevent the bacteria from spreading again, and irrigate the roots with carbendazim wettable powder when the bacteria take root.

The branches of lentils grow super vigorously, so the spacing is required to be farther, properly pinched and forked, ventilation and light transmission are not easy to get sick, planting lentils can not sweat unevenly, water should be mastered, otherwise it is easy to get tired insects in the greenhouse, lentils love insects, and planting in the greenhouse is better than the protected land, so there is no 5-7 spraying once, otherwise there are insects in the lentils, lentils are not easy to get sick, as long as you look at the insects, there will be a good harvest.

For example, lentil brown spot. Lentil brown spots mainly target the leaves. If the leaves are infected with the disease, the leaves will have lesions of different sizes.

Usually the lesions are not too large, but some are larger, dark purplish-brown, and appear in the middle and late stages of the disease. Grayish-brown, perforated, cracked. When the humidity in the field is high, a layer of grayish-black mold will appear on the lesions.

Black mold is the seed of this disease. If you are serious in the field, you will need to plant other crops next year, fertilize them properly, pay attention to drainage, and reduce the humidity in the field. It must be noted that after the lentils are harvested, the seedlings should be cleaned up in time to eliminate the seedlings of the germs, consolidate the land, and reduce the number of germs.

First of all, we should choose the right pesticides, be sure to prescribe the right medicine, spray pesticides regularly, remove pests in time, and then we should also keep the light sufficient, keep the temperature appropriate, the temperature should be controlled at about 23, prune some residual branches in time, avoid rotting, and do a good job of drainage and ventilation.

It is necessary to prevent in advance, to use some pesticides, but also to pay attention to the amount of pesticides, and to pay attention to the method of prevention and control.

The main control measures are the use of pesticides, the management of water and fertilizer, and the increase of light time, so that pest control can be controlled.

The time of lentil planting is a point that we need to pay attention to, because the climate in various regions of our country is still a little different, so the planting time must be early and late.

In order for lentils to grow well, with high yield and quality in the later stage, then the density of planting is also a very important issue. Under normal circumstances, it is best to plant 1,500 to 2,000 holes of lentils per acre, that is to say, the row spacing of each plant is about 50 to 70 centimeters, and the spacing between plants is about 50 to 60 centimeters.

Lentils are a fertilizer-loving plant, so its growth still requires a relatively large amount of fertilizer. In addition to the base fertilizer before planting, we also need to reasonably top dressing according to the different growth periods of lentils.

Be sure to pay attention to the temperature, the temperature should not be too high or too low, the temperature should be controlled at 19 degrees to 25 degrees, pay attention to the planting time and density, strengthen field management, be sure to water and fertilize in time, and do a good job of insecticide and weeding.

What you need to pay attention to and avoid when planting lentils is to pay attention to the prevention of pests and diseases, and you should water and fertilize reasonably, you should pay attention to the spacing, and if the temperature is too high, you should increase the amount of watering appropriately.

When making, it should be cleaned, cut into sections, and clean the shreds on the lentils, otherwise they will not taste crispy, pay attention to high-temperature cooking, and avoid not being fried.

Implement two to three years of rotation of seriously diseased fields and non-leguminous vegetables, disinfect seeds, plant them densely, increase fertilizer, and disinfect seeds when planting, adjust the sowing period, and stagger the peak period of adult oviposition.

1.Clean up the farm, after the previous crop harvest, to clear the land in time 2Trapping and killing adult insects and removing them with insecticides.

First, disinfect the seeds, mix methyl tobuzin in the seeds, which can greatly improve the insect resistance of the seeds, second, apply phosphorus and potassium fertilizer to the pea field to improve fertility, and third, spray the pea field with a sprayer to eliminate insect pests.