Journal of Applied Entomology - Zeitschrift für angewandte Entomologie (1994) 117, 135-143

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T.J. Poprawski, P.H. Robert and N.K. Maniania (1994)
Contact toxicity of the mycotoxin destruxin E to Empoasca vitis (Gothe) (Hom., Cicidellidae)
Journal of Applied Entomology - Zeitschrift für angewandte Entomologie 117 (2), 135-143
Abstract: The toxicity of destruxin E for nymphs of Empoasca vitis was assessed in the laboratory using various administrative routes: 10 ml of a given concentration of the toxin (30, 100, 300 and 1000ppm) were sprayed either on potato leaves or directly onto the insects, and 1µl of a 100 ppm concentration of toxin was applied onto the nota of the insects. Checks were made daily for 4 days and mortality in Empoasca vitis was recorded. Natural mortality was less than 5%. Nymphs of E. vitis were susceptible to the insecticidal activity of destruxin E in all three treatments. Mortality was concentration- dependent in nymphs exposed to treated leaves and in nymphs sprayed directly. The potency of destruxin E was reflected in the low LC 50 values obtained: 46,4 ppm for insects exposed to treated leaves and 38.2 ppm for insects sprayed directly. The LT50 values were 3.2 days (at 30ppm) and 0,2 days (1000ppm) for nymphs sprayed directly, and slightly higher for nymphs exposed to treated leaves. Analysis of data (100ppm) showed that there was no significant difference in mortality due to either of the three bioassay procedures. Mortality rates were 87,5% in nymphs sprayed directly, 93.8% in nymphs exposed to treated leaves, and 78.1% in nymphs in the topical application test. The LT50 value in the latter test (at 100ppm) was 1.3 days. Contact insecticidal activity of destruxin E from Metarhizium anisopliae is demonstrated here for the first time.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Nguya K. Maniania

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Hebata vitis
Metarhizium anisopliae (entomopathogen) Hebata vitis
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