NDLI: Effects of the entomopathogenic fungus , Lecanicillium longisporum on survival and population growth parameters of the cabbage aphid , Brevicoryne brassicae ( Hemiptera : Aphididae ) under laboratory conditions

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Effects of the entomopathogenic fungus , Lecanicillium longisporum on survival and population growth parameters of the cabbage aphid , Brevicoryne brassicae ( Hemiptera : Aphididae ) under laboratory conditions

Content Provider	Semantic Scholar
Author	Safavi, Seyed Ali Sarhozaki, Mehdi Taheri
Copyright Year	2019
Abstract	Abstract This study was carried out to determine the effects of the entomopathogenic fungus, Lecanicillium longisporum Zimmermann Strain LRC 190, on survival and population growth parameters of the cabbage aphid, Brevicoryne brassicae (L.) treated by using different conidial concentrations (1×10, 1×10, 1×10, 1×10, and 1×10 conidia/ml). Experiments were conducted at 23±1C temperature, 60±5 %RH and a photoperiod of 16: 8 h. (L: D) on cabbage seedlings, Brassica oleracea var. capitata under laboratory conditions. Based on the results the longevity of the aphid adults was significantly different based on conidial concentrations of L. longisporum (Petch) Zare and Gams. The shortest longevity of the cabbage aphid adults was 10.70±1.59 days when treated with 1×10 conidia/ml, compared to 22.65±0.94 days in control treatment. The LC50 value was 1.82×10 conidia/ml 7 days after inoculation. Net rate of reproduction (R0), intrinsic rate of increase (rm) and finite rate of increase (λ) were significantly reduced in treated aphids compared to control treatment. There was no significant difference among mean generation times (T) in populations treated with 1×10, 1×10, 1×10 conidia/ml (P>0.05). Fungal infection was detectedin lower rm values and prolonged doubling time (DT) in treated females (3.492 days at the concentration of 1×10 conidia/ml), compared to the control (2.652 days). Considering higher concentrations of L. longisporum can effectively reduce the cabbage aphid longevity, reproduction and population growth under laboratory conditions, it seems that the fungus has ability for biological control of the cabbage aphid.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.agrijournals.ir/article_119316_1bcf4af6f8d827b02a97ee7796988e5c.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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