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Conservation of the Sodium Channel between Different Insects is Explored

Jul 9, 2019

The voltage-sensitive sodium channel (VSSC) is essential for the generation and propagation of action potentials. The VSSC can change sodium kinetics by producing different splice variants (optional and mutually exclusive exons). The VSSC is the target site of pyrethroid insecticides as well as DDT and oxadiazines, which are used for control of crop pests and vectors of human diseases. Unfortunately, knockdown resistance (kdr) mutations in Vssc confer resistance to these insecticides. Recently, Silva and Scott 2019 investigated the conservation of VSSC by three approaches: (1) across insect Orders, (2) codon constraints of kdr mutations between populations of Aedes aegypti and (3) within a population of Drosophila melanogaster. Overall, VSSC is highly conserved across insects and within a population of an insect but important differences do exist. 


Insecticide resistance monitoring of House flies

Jul 9, 2019

House flies have evolved resistance to most insecticides, and as insecticide use continues over seasons it is expected that levels of resistance will rise. Freeman et al. recently investigated ( flies collected from livestock facilities in five states to check levels of resistance against three commonly used insecticides. A population collected from Kansas had previously unseen high levels of resistance to permethrin, a pyrethroid insecticide, that could mean this type of insecticide will be of limited use for house fly control in the United States in the near future.

Insecticide resistance in Drosophila melanogaster and sour rot

Jul 9, 2019

Control of sour rot in grapes is commonly achieved using insecticide to control D. melanogaster.  2018 was one of the worst years for sour rot in grapes in New York in decades. Sun et al. report that the outbreak of sour rot at one NY vineyard was associated with an inability to control D. melanogaster due to the evolution of resistance.