Systemic effects of thiamethoxam and chlorantraniliprole seed treatments on adult Lissorhoptrus oryzophilus (Coleoptera: Curculionidae) in rice

BACKGROUND: Feeding assays using adult rice water weevils and foliage of plants treated as seeds with chlorantraniliprole and thiamethoxam at different rates were conducted to evaluate the systemic adulticidal and feeding effects. Dose–mortality relationships were determined for thiamethoxam seed tr...

Full description

Saved in:
Bibliographic Details
Published in:Pest management science 2013-02, Vol.69 (2), p.250-256
Main Authors: Lanka, Srinivas K, Ottea, James A, Davis, Jeffrey A, Hernandez, Amy B, Stout, Michael J
Format: Article
Language:English
Subjects:
adults
Animals
Biological and medical sciences
chlorantraniprole
Coleoptera
Control
Curculionidae
Effects
ELISA
enzyme-linked immunosorbent assay
Feeding Behavior - drug effects
Fundamental and applied biological sciences. Psychology
Insect Control
insecticide residues
Insecticides
Insecticides - pharmacology
Insects
larvae
LC/MS/MS
leaf area
Leaves
lethal dose 50
Lissorhoptrus oryzophilus
mortality
Neonicotinoids
Nitro Compounds - pharmacology
ortho-Aminobenzoates - pharmacology
Oryza - drug effects
Oryza - growth & development
Oryza - parasitology
Oryza sativa
Oxazines - pharmacology
Phytopathology. Animal pests. Plant and forest protection
Plant growth
Protozoa. Invertebrates
Rice
rice water weevil
seed treatment
seed treatments
seeds
Seeds - drug effects
Seeds - growth & development
Seeds - parasitology
thiamethoxam
Thiazoles - pharmacology
Weevils - drug effects
Weevils - growth & development
Weevils - physiology
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:BACKGROUND: Feeding assays using adult rice water weevils and foliage of plants treated as seeds with chlorantraniliprole and thiamethoxam at different rates were conducted to evaluate the systemic adulticidal and feeding effects. Dose–mortality relationships were determined for thiamethoxam seed treatments by combining leaf area lost due to feeding and insecticide residues analyzed by LC/MS/MS. Changes in adulticidal activity of thiamethoxam were also investigated by contrasting adult mortalities at the 5–6‐leaf and tillering stages of rice. RESULTS: Adult weevil mortalities and leaf consumption rates on foliage were affected in thiamethoxam but not in chlorantraniliprole treatments when rice was at the 6–7‐leaf stage. The LD₅₀ for weevils feeding on thiamethoxam‐treated rice at the 2–3‐leaf stage was 447 pg insecticide weevil⁻¹ (95% CL: 25–830 pg weevil⁻¹) but was lower (142 pg weevil⁻¹; 95% CL: 102–180 pg weevil⁻¹) in experiments with 3–4‐leaf‐stage plants. Mortalities on leaves from 5–6‐leaf‐stage plants were consistently higher than on leaves from tillering plants. Thiamethoxam residues measured by ELISA increased with seed treatment rate and differed between plant stages. CONCLUSION: The LD₅₀ values developed in this study are the first values for leaf‐feeding insects on foliage of plants treated as seeds with thiamethoxam. The attrition of adulticidal activity of thiamethoxam in foliage of older plants may help to explain the reduced effectiveness of seed treatments against rice water larvae that is seen at later stages of rice growth in field studies. The differential activity of these two seed treatments on adults suggests that adult mortality contributes to the field efficacy of thiamethoxam but not to that of chlorantraniliprole. Copyright © 2012 Society of Chemical Industry
ISSN:1526-498X
1526-4998
DOI:10.1002/ps.3382