Summary: When rice planthoppers are severe, timely chemical control is the only option

Rice planthoppers are one of the pests and diseases in rice, and the pests reproduce rapidly, with a tendency toward outbreaks. Therefore, the control of rice planthoppers is definitely not something that can be solved by pesticide alone, so in our strategy for controlling rice planthoppers we still focus on prevention first, and treatment second. Below, Kexue Xingnong will briefly discuss this.

Biological control of rice planthoppers

At present there is still no particularly effective biological agent that can eliminate rice planthoppers, but in recent years some biological control methods have emerged to reduce the damage caused by rice planthoppers. That is, using the natural enemies of rice planthoppers to suppress outbreaks and bring rice planthoppers under control.

Studies have shown that adopting a duck-rice symbiotic system can greatly reduce the incidence of rice planthoppers, and can even achieve control of rice planthoppers. The control effect can reach 63.77-86.89%, and this model saves pesticide, is green, environmentally friendly and pollution-free, and is also a direction worth developing in the future. At the same time, raising ducks in rice fields also improves the economic benefits of field planting.

Chemical pesticide control

At present, several pesticides that are relatively effective against rice planthoppers include imidacloprid, buprofezin, nitenpyram, thiamethoxam and pymetrozine, etc. From the principle of action of these agents, they can be divided into two major categories: neonicotinoid insecticides and chitin synthesis inhibitors.

Neonicotinoid insecticides: such as imidacloprid, nitenpyram and thiamethoxam, which belong to nicotinic acetylcholine receptor agonists and achieve the purpose of killing insects through nerve-blocking action. This type of agent has good systemic properties and penetrating activity, can act by contact and stomach poison, and has very good efficacy against rice planthoppers. Moreover, this type of agent also has very good effects on thrips, whiteflies, leafhoppers and others in rice fields, and belongs to broad-spectrum insecticides.

Buprofezin belongs to chitin synthesis inhibitors. After use, this type of agent reduces the number of eggs laid by the insects, and can even cause the eggs to fail to hatch, and can achieve the effect of shortening the lifespan of the pests. However, its efficacy takes longer, and generally it takes a week to see very good results.

As for the specific methods of using these agents, we will not introduce them in too much detail here; the instructions on the pesticide bags also have detailed introductions. For the use of these agents, Kexue Xingnong suggests adopting a method of alternating use, and not choosing the same agent every time. This practice easily causes rice planthoppers to develop resistance, while rotating agents greatly reduces the probability of resistant pests appearing, and the efficacy will also be better.

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