What are the biological pesticides? What are their advantages and disadvantages?

Biological pesticide is a broad-spectrum, efficient and safe pesticide.

It can not only effectively control a variety of pests, but also is harmless to people and animals.

Here is a brief introduction of biological pesticides, their advantages and disadvantages and other related issues for your reference.

1. What is a biological pesticide?

According to FAO standards, biological pesticides are generally natural compounds or gene modifiers, mainly including biochemical pesticides and microbial pesticides, excluding agricultural antibiotic preparations.

Biopesticides in China can be divided into four parts according to their components and sources: microbial live pesticides, microbial metabolites pesticides, plant-derived pesticides and animal-derived pesticides.

According to the control objects, it can be divided into pesticides, fungicides, herbicides, acaricides, rodenticides, plant growth regulators and so on.

In the practical application of agricultural production in China, biological pesticides generally refer to microbial pesticides that can be produced on a large scale.

Second, the advantages and disadvantages of biological pesticides

1, Advantages: The most prominent point of biological pesticides is safety, which is safe for people, animals, environment and natural enemies.

Some biological pesticides are living organisms, which can reproduce themselves after use, greatly prolonging the duration and building a new environment of ecological balance.

In addition, biological pesticides are widely available, have great improvement potential and are not easy to produce drug resistance. Many advantages make biopesticides a hot spot in recent years.

2. Disadvantages: Compared with chemical pesticides, it also has many inherent weaknesses, such as slow onset, susceptibility to temperature and humidity, and complex components.

Third, the scope of use of biological pesticides

Biological pesticides are mainly used to control cotton bollworm, red bollworm, bridge-building worm, tobacco budworm and so on.

Chilo suppressalis, Chilo suppressalis, rice corn borer, rice leaf roller, etc.

Vegetable cabbage caterpillar, diamondback moth, cabbage caterpillar, etc.

Dendrolimus punctatus, peach moth, foot moth, big bag moth, leaf curl moth, etc. Fruit trees.

The suitable period for controlling cotton bollworm is: when the number of eggs per 100 plants reaches 20, apply pesticide 1 time every 3-4 days, 2-3 times per generation, and appropriately increase the application times every year.

Other pests, such as cabbage caterpillar, Bemisia tabaci, bean moth, corn borer, Dendrolimus punctatus and fruit tree pests, can be applied in the peak spawning period or early larval stage.

Fourthly, the use of biological pesticides depends on 1 and temperature.

When used at 25℃ ~ 30℃, the control effect is twice as high as that of 10℃ ~ 15℃.

Therefore, it is best not to use it when the temperature is below 20℃.

2. Look at the humidity.

The higher the environmental humidity, the better the control effect.

Powder bt can give full play to its efficacy under high humidity conditions.

3. Look at the sunshine.

In order to avoid the destruction of spores by ultraviolet rays in the sun, it is best to spray them on cloudy days or in the afternoon.

4. Be careful of the rain.

Moderate to heavy rain will wash away the liquid medicine sprayed on the stems and leaves of plants, thus reducing the efficacy.

After spraying, the Mao Mao rain in milk decreased, which increased the preventive effect.

If there is moderate to heavy rain after spraying, be sure to spray again.