کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
22128 | 43255 | 2007 | 8 صفحه PDF | دانلود رایگان |
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°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°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 6.55×105 conidia/ml. The control values of M. persicae resulting from the application of 1×107 and 1×108 conidia/ml were nearly the same and were significantly higher than that of 1×106 conidia/ml. The tested entomopathogenic fungi grew in a broad temperature range (15–30°C). Lecanicillium strains showed optimum growth at 25°C. The aerial conidia of Lecanicillium strains also could germinate in a broad temperature range (15–30°C) and L. lecanii 41185 was the only strain with conidial germination at 35°C.
Journal: Journal of Bioscience and Bioengineering - Volume 104, Issue 6, December 2007, Pages 498–505