The invention discloses a preparation and a method for improving the
control effect of entomopathogenic nematodes on thrips. The preparation comprises entomopathogenic nematodes and
carvacrol. The entomopathogenic nematodes and the
carvacrol are jointly used for preventing and treating the thrips, under the condition that the same number of Steinerema carpocapsae All (SC for short) entomopathogenic nematodes are applied, the fatality rate of the thrips in the pupal stage by adding the low-concentration
carvacrol for treatment is obviously higher than the fatality rate of the thrips in treatment by independently using the entomopathogenic nematodes, the prevention and
treatment effect on the thrips is obviously improved, and the economic benefit is remarkable. Compared with the
single use of the entomopathogenic nematodes, the composition overcomes the limitations of slow effect and
low toxicity on the thrips. Meanwhile, carvacrol has no problems of environmental
pollution,
drug resistance and the like compared with
chemical agent prevention and treatment, the dosage of
chemical agents can be greatly reduced, and the carvacrol is greener and
safer. Therefore, the preparation and the method provided by the invention have wide application prospects in
agricultural pest control.