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Aphidicidal activity of a novel botanical insecticide made by alkalization of bamboo tar

Articles

Journal/Conference:

CROP PROTECTION

Language:

English

Author:

Tong SenMiao

Experts:

Feng MingGuang

Year:

2016

Volume:

87

Pages:

85-89

Keywords:

Bamboo tar; Waste utilization; Alkalization; Aphidicidal activity; Botanical insecticide; Aphid control

Bamboo tar is a water-insoluble semi-solid waste generated from bamboo charcoal processing, and its increasing accumulation threatens environment and sustainability of the charcoal industry that enhances the economic value of bamboo forestry in southern China. Here we converted bamboo tar to a completely water-soluble sodium salt through full alkalization with NaOH and evaluated its insecticidal activity against the cotton aphid Aphis gossypii, the soybean aphid Aphis glycines and the green peach aphid Myzus persicae in laboratory bioassays and field trials. The tar salt LC(50)s against the three global aphid pests decreased to 35-93 mu g/ml on day 7 from 246 to 486 mu g/ml on day 3. In three field trials, the tar salt at the application rates of 338-675 g/ha controlled the aphid pests as efficaciously as but more persistently than pymetrozine (a synthetic aphidicide) at the recommended rate. Our results highlight an easy approach to converting bamboo tar to a promising botanical aphidicide but extensive further work to determine its toxicity and environmental and crop safety is needed. (C) 2016 Elsevier Ltd. All rights reserved.