Entomologia Sinica (1997) 4, 74-81

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Chenzhu Wang, Shufang Zhang, Jihong Zhang and Xiufeng Xiang (1997)
Effect of tannic acid on the effectiveness of Bacillus thuringiensis var. kurstaki against Helicoverpa armigera (Hübner)
Entomologia Sinica 4 (1), 74-81
Abstract: The role of tannic acid in increasing effectiveness of Bacillus thuringiensis var. kurstaki (HD-1) against Helicoverpa armigera was examined in bioassays on semisynthetic diet. Concentrations of B. thuringiensis (0 %, 0.005 %, 0. 01 %, 0.015 %, 0.02 %, 0.025 % wet weight) were incorporated into the diet containing 0. 025% tannic acid and tannic acid-free diet. LD50 of B. thuringiensis with tannic acid were 0.006% but that without tannic acid was 0.011%. Both B. thuringiensis and tannic acid retarded growth of H. armigera significantly, but there was no synergetic effect between them. Choice tests showed that B. thuringiensis deterred feeding of the fifth instar larvae of H. armigera but tannic acid had no such effect. Experiments on colony growth of B. thuringiensis on NBA media containing tannic acid (0, 1, 3, 6, 9, 12, 15, 18, 21 mg/100 ml) demonstrated that tannic acid reduced colony growth of B. thuringiensis, and inhibited sporulation above 15 mg/100 ml.
(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): Chen-Zhu Wang

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.


Helicoverpa armigera
Bacillus thuringiensis var. kurstaki (entomopathogen) Helicoverpa armigera