1, natural enemy

Natural enemies that feed on termites can be divided into two categories: random and targeted. The organisms that can eat termites at will mainly include Acari, Lipopoda and Araneae.

Ants are the most important random predators of termites, and they are easy to meet when looking for food. Some kinds of ants will take termites as their target prey, such as Forminae and some ant populations of Forminae take termites as their main food, and African giant ants will attack cocoa termites and take termites as their target food.

2. Bacteria

Good results can be achieved by using pathogens to control termites, and Bacillus thuringiensis, Pseudomonas aeruginosa and Serratia marcescens can be used to control termites.

Through the worker ant experiments on several termite populations, it was found that 100% of termites could be eliminated in about one month, and the effect was very obvious.

3. Virus

There are not many cases of using virus to control termites, but the way of virus transmission between hosts can well meet the relevant requirements. The use of virus to control termites is limited to the laboratory and has not been applied to the actual environment.

Moreover, the virus has its own defects, which will be affected by the temperature and humidity in the environment. The reproduction of the virus will be limited by the living host, and the cost of prevention and control is relatively high. This method is not suitable for large-scale use.

4. Fungi

There are many studies on the prevention and control of termites by fungi. In recent decades, the data related to this method can reach 65%. At present, there are 22 kinds of fungi that can be used as specific ectoparasites of termites, and at least 20 kinds of fungi have pathogenic effects on termites.

Terrestrial termites are the most harmful in China. Many studies have shown that Metarhizium anisopliae can make termites ill, and the mortality rate of termites population reaches 85% after 5 ~ 35 minutes of contact. If the contact time reaches 40 min, the mortality of termites can rise to100%; If the contact time is prolonged, termites will be completely extinct within 1 d, and Beauveria bassiana has little effect on termites.

5. Nematodes

At the beginning of the 20th century, researchers found nematodes in the head of Taiwan dairy termites, which had a strong pathogenic effect on termites. Therefore, in 1930s, the research on termite control by nematodes was carried out.

There are many researches and applications of using nematodes to control termites in the world, but the results are slow and complicated, and the control effect on dry wood termites and wood termites in the field is limited.

6. antibiotics

When using antibiotics to control termites in China, avermectin and its derivative ivermectin are often used. Avermectin was first used to control parasitic nematodes. In the laboratory test, avermectin at the concentration of 20 mg/kg can kill termites, and the peak of termite death is 4 ~ 5 days after application, with a mortality rate of 32%. Exposure of each termite to a dose of 0.03 1.2 g will make the termite semi-lethal.

Will not pollute the natural environment. Ivermectin was used to control Lateolabrax japonicus and Reticulitermes flavipectus in Taiwan Province. When the concentration of the solution reaches 25 mg/L, it has good insecticidal effect.

When the concentration is 100 mg/L, the mortality of termites can reach 100% after 24 hours. This experiment is rarely used in the field, and it needs to use a higher dose of drugs and seal it to effectively penetrate termites, and the effective concentration will be much higher than that under the indoor test conditions.

Baidu encyclopedia-termites