Acaricidal properties of a Chenopodium-based botanical.
The emulsifiable concentrate UDA-245 [25% EC (vol:vol)], based on an essential oil extract from Chenopodium ambrosioides variety ambrosioides, a North American herbaceous plant, was compared with commercially available pesticides for their effectiveness to control the adult stage and egg hatch of the twospotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae) and the European red mite, Panonychus ulmi (Koch) (Acari: Tetranychidae). After a laboratory bioassay with adult twospotted spider mites, a 0.5% concentration of UDA-245 was more effective than 0.7% (AI) of neem oil (Neem Rose Defense). After a similar bioassay with the European red mite, a 0.5% concentration UDA-245 was as effective as 0.006% (AI) of abamectin (Avid). UDA-245 at 0.5% significantly reduced egg hatch of the twospotted spider mite, 5 and 9 d after treatment and of the European red mite 6 d after treatment. Egg hatch was significantly lower using 0.006% (AI) of abamectin, 0.7% of neem oil, and 1.0% insecticidal soap than UDA-245. Residual tests indicated that UDA-245 may be persistent in the environment only for a few hours. Only 23% mortality was noted when mites were introduced on bean leaves 1 h after treatment with a 2% concentration of UDA-245. At the recommended dose of 0.5%, UDA-245 was not considered phytotoxic for most plants tested, i.e., lettuce, roses, and tomatoes. Results suggest that a greenhouse integrated pest management program using UDA-245 could effectively and selectively control mite infestations by treating "hot spots" with negligible effect on biological control agents when treating before introduction or when natural enemies are absent.
Chiasson
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Codena Inc., 426, chemin des Patriotes, Saint-Charles-sur-Richelieu, Québec, Canada J0H 2G0.
Bostanian
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NJ
Vincent
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C
D000053:Acari; D000818:Animals; D027464:Chenopodium ambrosioides / Q000737:chemistry*; D007306:Insecticides / Q000008:administration & dosage*; D009822:Oils, Volatile / Q000008:administration & dosage*; D010063:Ovum; D010936:Plant Extracts / Q000008:administration & dosage
D007306:Insecticides; D009822:Oils, Volatile; D010936:Plant Extracts; C493088:UDA-245