The invention relates to the field of agricultural planting, in particular to a biodegradable mulching film for preventing and controlling pests in rice fields and a preparation method of the biodegradable mulching film. The mulching film comprises a biodegradable base material, biopheromone and auxiliaries, the biopheromone is intraspecific
pheromone capable of influencing the same species of organisms or interspecific
pheromone capable of influencing different species of organisms,
mating and breeding of pests can be influenced through the intraspecific
pheromone,
natural enemies of the pests can be attracted through the interspecific pheromone, and therefore the pests can be prevented and controlled. The preparation method comprises the following steps: preparing raw materials of each component; performing
drying pretreatment on the raw materials and uniformly mixing the raw materials; carrying out
melt blending on the mixture; and performing film blowing forming to obtain a mulching film finished product. According to the invention, the
physical barrier prevention and
control function of the mulching film and the biochemical regulation and
control function of the biopheromone are integrated, the synergistic interaction on pests is realized, and the biopheromone can be gradually degraded along with the mulching film, so that the effects of long-acting slow release, time saving and labor saving can be achieved.