Efficacy of Imidacloprid for Control of Cereal Leaf Beetle (Coleoptera: Chrysomelidae) in Barley

The toxicity of imidacloprid to the cereal leaf beetle, Oulema melanopus (L.), was measured under laboratory and field conditions. Insect mortality and plant damage were determined from artificial and natural infestations of O. melanopus applied to various growth stages of barley. All rates of imida...

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Bibliographic Details
Published in:Journal of economic entomology 2000-02, Vol.93 (1), p.38-42
Main Authors: Tharp, C., Blodgett, S. L., Johnson, G. D.
Format: Article
Language:English
Subjects:
and imidacloprid
Animals
Biological and medical sciences
cereal leaf beetle
cereals
Chemical control
Coleoptera
Control
Ecotoxicology
Fundamental and applied biological sciences. Psychology
Hordeum - growth & development
Imidazoles
Insecticides
Larva
Neonicotinoids
Nitro Compounds
Oulema melanopus
Phytopathology. Animal pests. Plant and forest protection
Protozoa. Invertebrates
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Summary:The toxicity of imidacloprid to the cereal leaf beetle, Oulema melanopus (L.), was measured under laboratory and field conditions. Insect mortality and plant damage were determined from artificial and natural infestations of O. melanopus applied to various growth stages of barley. All rates of imidacloprid formulated and applied as a seed treatment caused >90% mortality to cereal leaf beetle larvae when barley was infested with eggs at the 4-leaf stage, but were ineffective when barley was infested with eggs at the early tillering or flag-leaf stages of barley. This window of susceptibility influenced results obtained in field trials where peak larval emergence did not occur until the early tillering stage of barley. The resulting mortality in plants from treated seeds never exceeded 40% in the field. Foliar imidacloprid, however, caused >90% mortality in the field, and may be another option in the management of the cereal leaf beetle.
ISSN:0022-0493
1938-291X
0022-0493
DOI:10.1603/0022-0493-93.1.38