title: Selection of entomopathogenic fungi for aphid control.
abstract: Twelve strains of entomopathogenic fungi such as Lecanicillium lecanii, Paecilomyces farinosus, Beauveria bassiana, Metarhizium anisopliae, Cordyceps scarabaeicola, and Nomuraea rileyi were screened for aphid control. At 25 degrees C and 75% relative humidity (RH), among tested entomopathogenic fungi, L. lecanii 41185 showed the highest virulent pathogenicity for both Myzus persicae and Aphis gossypii, and their control values were both nearly 100% 5 and 2 d after treatment, respectively. Moreover, at an RH of 45% and in a wide temperature range (20-30 degrees C), L. lecanii 41185 also exhibited the highest virulence to M. persicae. The control value of M. persicae and the 50% lethal time (LT50) decreased significantly as the applied conidial concentration increased. The 50% lethal concentration (LC50) of the conidial suspension of this fungus was determined to be 6.55x10(5) conidia/ml. The control values of M. persicae resulting from the application of 1x10(7) and 1x10(8) conidia/ml were nearly the same and were significantly higher than that of 1x10(6) conidia/ml. The tested entomopathogenic fungi grew in a broad temperature range (15-30 degrees C). Lecanicillium strains showed optimum growth at 25 degrees C. The aerial conidia of Lecanicillium strains also could germinate in a broad temperature range (15-30 degrees C) and L. lecanii 41185 was the only strain with conidial germination at 35 degrees C.
authors.affiliation: Department of Bioscience and Biotechnology, The University of Suwon, San 2-2, Wau-ri, Bongdam-eup, Hwaseong-si, Gyeonggi-do 445-743, Korea.
authors.forename: Van Hanh
authors.initials: VH
authors.lastname: Vu
authors.forename: Suk Il
authors.initials: SI
authors.lastname: Hong
authors.forename: Keun
authors.initials: K
authors.lastname: Kim
mesh_terms: D000818:Animals; D001042:Aphids / Q000382:microbiology* / Q000502:physiology*; D005658:Fungi / Q000145:classification / Q000254:growth & development* / Q000302:isolation & purification / Q000472:pathogenicity*; D010572:Pest Control, Biological / Q000379:methods*; D016019:Survival Analysis; D015996:Survival Rate