Impacts of neonicotinoid resistance on tobacco thrips, Frankliniella fusca, in the mid-south
Monday, November 16, 2015: 8:27 AM
200 D (Convention Center)
Chelsie Darnell
,
Biochemistry, Molecular Biology, Entomology, and Plant Pathology, Mississippi State University, Mississippi State, MS
Angus Catchot
,
Dept. of Biochemistry, Molecular Biology, Entomology and Plant Pathology, Mississippi State University, Mississippi State, MS
Fred Musser
,
Biochemistry, Molecular Biology, Entomology, and Plant Pathology, Mississippi State University, Mississippi State, MS
Don Cook
,
Delta Research and Extension Center, Mississippi State University, Stoneville, MS
Jeff Gore
,
Delta Research and Extension Center, Mississippi State University, Stoneville, MS
Darrin Dodds
,
Plant and Soil Sciences, Mississippi State University, Mississippi State, MS
Shannon Morsello
,
Department of Entomology, North Carolina State University, Raleigh, NC
This paper will address reduced insecticidal efficacy of imidacloprid, thiamethoxam, and clothianidin against tobacco thrips,
Frankliniella fusca (Hinds), in the Mid-Southern Region. Over the past several years tobacco thrips, have become an increasing problem throughout the cotton cropping systems in the South. Thrips can cause a delay in maturity and cause a reduction in yield if not controlled. If infestations are severe, thrips can cause a loss of apical dominance or even kill plants. Currently, seed treatments are the primary means of controlling tobacco thrips in cotton. It is critical to understand the potential levels of resistance currently established in populations throughout the southern region of the U.S.
Dose-response bioassays with the three commonly used neonicotinoid insecticides were performed on field-collected adult female tobacco thrips during May and June, 2014 and 2015. Populations were collected from agricultural regions in Mississippi from wild hosts as well as from insecticide-treated crops. 2014 results showed resistance was largely limited to thiamethoxam and clothianidin in the Delta region. However, 2015 suggests resistance is rapidly increasing to all three neonicotinoids throughout the state. Over the past several years farmers have seen a decrease in tobacco thrips control from thiamethoxam . During the 2015 growing season similar control problems with imidacloprid were observed. Further research is planned to confirm findings and to explore the mechanisms that are responsible for resistance to these insecticides.
