Aspects of insecticide resistance and reproductive biology ofAphis gossypii glover on seed potatoes

Abstract

SummaryFor several years the aphid population patterns and the incidence of the main potato virus diseases have been monitored in Italian potato-growing areas. Starting from 1992, an increase in Aphis gossypii, as compared to Myzus persicae, Macrosiphum euphorbiae and Aphis fabae, was observed on seed potato fields in the north of Italy.Laboratory tests revealed that A. gossypii was insensitive to the pesticide pirimicarb, even at the maximum dose tested (2400 lag/ml). Moreover, in the presence of pirimicarb the reproductive capacity increased up to 30% as compared with the control, and the new-born aphids began to appear 2 days earlier in the treated group. By contrast, M. persicae was controlled at a lower dose (300 pg/ml). Lambda-cyhalothrin and imidacloprid were very effective against both aphids.

Evaluación de la susceptibilidad de Aphis craccivora Koch (Hemiptera: Aphididae) a pirimicarb en condiciones de laboratorio

“…Herron et al (2001) determinaron la CL 50 para poblaciones resistentes y susceptibles de A. gossypii a pirimicarb la que varió entre 1.727,0 y 4.909,0 mg·L -1 y 1,15 y 1,52 mg·L -1 , respectivamente. Tabacian et al (2011) como Rongai et al (1998) no han detectado efectos del pirimicarb sobre el áfido A. gossypii incluso con las dosis máximas ensayadas 2.400 µm·L -1 . En cuanto a la relación entre la dosis recomendada para campo y la CL 50 , Desneux et al (2004) obtuvieron un valor de 67,99 mg·L -1 para pririmicarb aplicado contra M. persicae indicando una gran diferencia entre la toxicidad mostrada por este i.a.…”

“…Pirimicarb (dimetilcarbamato de 2-dimetilamino-5,6-dimetilpirimidin-4-ilo) es un insecticida que se emplea extensivamente contra áfidos de frutales y hortalizas (Rongai et al, 1998;Furiatti y Lázarri, 2000;Araya et al, 2004;Walker et al, 2007;Raboudi et al, 2012;Fenoll et al, 2015). Presenta acción selectiva y baja toxicidad para los enemigos naturales y poco riesgo para las abejas (Araya et al, 2004).…”

Potential and Limitations of Plant Virus Epidemiology: Lessons from the Potato virus Y Pathosystem

“…Further examples of evolving components of plant virus pathosystems are the evolution of vectors in response to insecticide treatments (Rongai et al 1998) and the evolution of virus strains that do not induce visible symptoms in the host and are therefore difficult to rogue. While the direction of such evolutionary changes and some general patterns may be relatively easy to predict (e.g.…”

Vegetable oil formulation as biopesticide to control California red scale (Aonidiella aurantii Maskell)

“…In recent years, the extensive and continuous use of chemical insecticides in crop protection has triggered the onset of resistance phenomena in several plant pests (Sauphanor et al 1996;Rongai et al 1998), considerable environmental pollution and a severe impact on human and animal health. This scenario has prompted an increased demand for more environmental-friendly products in order to minimize the collateral eVect of their extensive application in plant defence.…”