Residual Efficacy of Three Spinosad Formulations Against Psorophora columbiae Larvae in Small Rice Plots

Abstract

Experiments were conducted to determine the residual efficacy of both a briquette and a granular formulation (2 rates) of a numbered spinosad compound against Psorophora columbiae larvae in small rice plots. Comparisons were also made between the numbered compounds and labeled granular and briquette formulations of methoprene. Both rates of the spinosad granules had the highest initial efficacy (100% control), with the spinosad briquette being the least effective. However, 1 wk after treatment, the spinosad briquette was equally effective to both spinosad granules, suggesting a slow release in the briquette. The experimental briquette and the high rate of the experimental granules had the most residual activity, providing over 80% control for 33 days posttreatment. The granular methoprene formulation was the least residually effective compound, providing only 12% control at 7 days posttreatment.

Spinosad: a biorational mosquito larvicide for use in car tires in southern Mexico

“…restuans , and Ae. japonicus in catchbasins in Connecticut [35], Psorophora columbiae in rice plots in Florida [36], and An. stephensi in water tanks in India [37].…”

Psorophora columbiae (Dyar & Knab), Dark rice field mosquito

“…Floodwater mosquitoes quickly occupy temporary standing water, often after the onset of heavy rains and the resulting flooding of low areas that are not necessarily connected to adjoining streams or ponds. As a consequence, the species is frequently found in close association with agricultural wetlands (Botello et al 2013) such as rice fields or areas of irrigation runoff (Allen et al 2010). Flooding of arid habitats in southwest US desert and semi-arid transitional lands, particularly from irrigation, can result in population explosions of Psorophora columbiae (Godsey et al 2012, Britch et al 2011, Pitzer et al 2009.…”

“…Habitat identification is a critical first step for management. When ephemeral pools, drainage areas, and shallow floodplains are treated with biorational larvicides such as Bacillus thuringiensis israelensis (Bti) or Spinosad, the emergence of pestiferous, possibly harmful, adults can be virtually eliminated from the targeted area (Allen et al 2010;2008). Otherwise, point-source adulticides applied to harborage sites and along structural barriers that intercept the flight path of Psorophora columbiae can effectively reduce human contact with adult mosquitoes (Britch et al 2011).…”

Exposición Bioacumulativa a Metales Pesados en Gambusia Punctata Y Gambusia Puncticulata Del Ecosistema Almendares, La Habana-Cuba

“…Uno de los organismos representados a lo largo de todo el cauce del río Almendares son los peces del género Gambusia. Estos peces, se encuentran distribuidos en casi todas las aguas interinas de Cuba (Alayo 1973), y generalmente, han sido reconocidos a nivel mundial como biorreguladores de culícidos (Offill & Walton 1999, Lee 2000, Vargas & Vargas 2003, Fimia-Duarte et al 2015. Sin embargo, los estudios iniciados en las especie Gambusia punctata (Poey, 1854) por Argota et al (2013ab) y Argota & Iannacone (2014a), pueden permitir que en la especie Gambusia puncticulata (Poey, 1854), la cual convive con la especie G. punctata en el río Almendares e indicar la posibilidad de revelar informaciones del estado ambiental de este ecosistema con El río Almendares ubicado en La Habana-Cuba, pertenece a una de las ocho cuencas hidrográficas más importantes de país, la cual se denomina Almendares-Vento.…”