Insecticidal activity of the crude extract from Epichlo? bromicola against Rhopalosiphum padi
Da-Hai Mei1, Ting Ren2 and Qiu-Yan Song3*
Published: May 09, 2022
DOI: 10.55162/MCNH.01.004
Abstract
Rhopalosiphum padi is an important pest in agricultural production. In order to reduce the use of chemical pesticides and improve the control effect, the study reported the insecticidal activity of the crude extract from 18 strains Epichloë bromicola isolated from Elymus tangutorum. The results showed that the crude extract of E. bromicola displayed insecticidal activity against R. padi. The results showed that 6strains with good activity were strains 3, 4, 5, 7, 8, and 18, and their mortality rate (65%, 71.7%, 75%, 88.3%, 60%, and 70.0%) reached more than 60% at 48h. However, the five strains of 4, 13-15, and 17 had no insecticidal activity, but could promote the growth of R. padi. Among them, strain 7 had the best insecticidal activity at 48h, and the mortality rate reached 88.3%. At the same time, the mortality rate of 48h was significantly higher than that of 24h. In conclusion, the crude extract of strain 7 with significant insecticidal activity will be of great significance for the biological control of R. padi in the future.