Effects of some materials extracted from Ajuga species on the larvae of Hyphantria cunea and its natural enemies.

Autor: Defu, Chi, Bela, Darvas, Rubio, Rafael, Chuanling, Jin
Zdroj: Journal of Forestry Research (1007662X); Jun1997, Vol. 8 Issue 2, p99-103, 5p
Abstrakt: Six kinds of extracts drawn from Ajuga multiflora and A. multiflora var. brevispicata and A. multiflora var. serotina using methanol and acetone were used in this experiment to test their killing activity to the second instar larvae of Hyphantria cunea and their influence on its natural enemies. The average death rate caused by those extracts on the second instar larvae was 85.70%. The mortality rate caused by the extracts drawn with methanol was from 88.89% to 96.33%, which was significantly higher than that caused by acetone extracts. Those extracts were safe to Trichogramma dendrolimi, Coccinella septempunctata, the natural enemies of H. cunea. We did not found any evidence shown that those extracts had any influence the emergence and the development of T. dendrolimi. Those methanolic extracts gotten from A. multiflora and A. multiflora var. brevispicata had no significant effects on the mortality of the larvae and adults of C. septempunctata. Those extracts could be used in the control of H. cunea safely. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
Externí odkaz: