The present invention belongs to the technical field of agricultural
disease prevention and control, and specifically relates to a synergistic composition for preventing and treating cycad anthracnose. A synergistic composition, the active ingredients of which are formed by a
binary compound of osthole and pyraclostrobin,
myclobutanil or
flusilazole, and the
mass ratio of the osthole to pyraclostrobin,
myclobutanil or
flusilazole is 1-100:100-1. When osthole is compounded with pyraclostrobin,
myclobutanil or
flusilazole in the synergistic composition of the present invention, it shows a synergistic effect on the cycad anthracnose
pathogen within a certain
mass ratio range, which can improve the prevention and
control effect of cycad anthracnose, reduce the amount of
pesticide used, reduce the cost of prevention and control, and alleviate environmental
pollution. In addition, the
mechanism of action of osthole is different from that of other ingredients, which can
delay the development of
pathogen resistance, reduce the risk of
drug resistance, and extend the service life of the agent, which is of great significance to the comprehensive management of agricultural resistant diseases.