Metaflumizone uses in cotton for management of Lygus lineolaris
BASF Corporation, Research Triangle Park, North Carolina, USA
Correspondence: john.harden@basf.com
Metaflumizone belongs to a new chemical class of insecticides, the semicarbazones, which block the voltage-dependent Na+ channel of susceptible insects (SCBI, IRAC MoA Group 22B) and does not require bio-activation to become an active insecticide. Metaflumizone is active primarily via ingestion. With the advent of Bt containing cotton varieties, there have been shifts in the cotton insect pests from a lepidopteran complex to a Lygus (plantbug) complex. The Lygus complex has become important across the cotton belt through yield reductions. Laboratory studies indicate that Metaflumizone SC was very active against Lygus species. However, early field trails against the two major species of Lygus, Lygus lineolaris and Lygus hesperus, indicated only moderate control (60 – 70%). Field studies comparing formulations of metaflumizone on Lygus lineolaris indicate that foliar treatments of metaflumizone as an EC formulation provides superior control than the SC formulation. Metaflumizone EC at 280 gai/ha was comparable to acephate at 560 – 1120 gai/ha as the standard for Lygus control. Mortality was slower to occur than with acephate, but cotton yields were equal. This led to the conclusion that Lygus damage to the crop had ceased following the application of metaflumizone. Metaflumizone is being developed as part of a Lygus Integrated Pest Management (IPM) program. Treatments which include metaflumizone at 280 g ai/ha are: metaflumizone fb acephate fb dicrotophos, metaflumizone + cyfluthrin fb acephate fb dicrotophos, thiamethoxam fb metaflumizone, acephate fb metaflumizone + cyfluthrin. The standard for comparison is thiamethoxam fb dicrotophos fb acephate. Yields taken from the treatments containing metaflumizone are comparable to that of the standard.
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