What are the disadvantages of chemical control in plant protection? What are the disadvantages of chemical control in plant protection?

Advantages and disadvantages of chemical control and biological control

The methods generally adopted in the control of crop pests and diseases are no more than two kinds of chemical control and biological control, and they have their own advantages and disadvantages.

Advantages of chemical control: under certain conditions, the pests can be quickly eliminated in a short period of time, and the density of insect population can be lowered.

Disadvantages of chemical control: the long-term use of easy to produce drug damage, especially long-term application of a drug can make the disease, insect resistance, pollution of the environment, kill natural enemies.

The advantages of biological control: small pollution to the environment, can effectively protect the natural enemies, play a sustained control role.

Disadvantages of biological control: the effect of killing insects is slow, and the use of high population density can not achieve the purpose of rapid depression of the population.

Because the effect of biological control is easily affected by environmental factors, the effect is not as fast as chemical control, and artificial propagation and cultivation of beneficial organisms of high technical difficulty, can be used for the release of a large number of species of natural enemies, most of the role of the natural enemies of a narrower range of pests, such as predation and parasitism, and other shortcomings of the selective. Most of the control of field crop pests and diseases still use chemical control methods. But to remind a point is: to try to use efficient, low-toxicity, low-residue, less lethal pesticides on natural enemies, reduce pollution of the environment, protect the natural enemies, to achieve sustained control of pests and diseases of the effect.