Influence of Sublethal Exposure to Abamectin on the Biological Performance of <I>Neoseiulus longispinosus</I> (Acari: Phytoseiidae)

Abstract

Effects of sublethal exposure to abamectin on the biological performance of Neoseiulus longispinosus (Evans) were studied under ambient laboratory conditions of 28 +/- 2 degrees C and 80 +/- 15% RH with 24 h light. The red form of the twospotted spider mite, Tetranychus urticae Koch, complex (Acari: Tetranychidae), was offered as prey. The LC50 obtained from the contact bioassay at 48 h after treatment was 0.015 ppm (AI). A big change in kill for a given variation in dosage for the regression slope probably indicated that abamectin was unlikely selective. Sublethal exposure to abamectin caused a reduction in survival with the female reaching 50% mortality by the sixth day and the male 4 d later. The mean preoviposition period was extended by almost 1 d, whereas the mean oviposition period was shortened by almost 5 d causing a reduction in the mean fecundity female-1 to almost half that of the untreated females. The net reproductive rate (Ro), the intrinsic rate of increase (rm), and the finite rate of increase (lambda) of the treated females were markedly inferior. Treated males were seriously affected; the mean life span was almost half that of the untreated.

Effects of Some Pesticides on the Predatory Mite, Neoseiulus longispinosus (Evans) (Gamasina: Phytoseiidae)

“…In contrast, our study showed that it was highly toxic to immatures, although it was harmless to the adult female. Our result in abamectin is consistent to Ibrahim and Yee (2000), who showed that abamectin was toxic to N. longispinosus, while Zhang and Sanderson (1990) suggested that this chemical was not highly toxic to P. persimilis.…”

“…womersleyi (Amano et al, 2004;Kim and Paik, 1996;Kim and Seo, 2001;Mochizuki, 2003). The influence of abamectin on the biological performance of N. longispinosus in Malaysia was reported by Ibrahim and Yee (2000). Singh and Singh (2005) reported the effects of some broad-spectrum insecticides used in India on the predator.…”

Sublethal effects of flonicamid and thiamethoxam on green peach aphid, Myzus persicae and feeding behavior analysis

“…Effects of exposure to sublethal concentrations of pesticides on longevity seem to be highly dependent on the type of pesticide and the exposed insect species. Some studies show that sublethal concentrations of pesticides reduce the longevity [Ibrahim and Yee, 2000;Desneux et al, 2007;Boina et al, 2009], whereas others indicate no sublethal effects on insect longevity [Yokoyama and Pritchard, 1984;Pons et al, 1999]. Occasionally, exposure to sublethal doses of pesticides can increase the lifespan of certain insects [Ball and Su, 1979].…”

Effects of Some Acaricides on Life Table Parameters of the Predatory Mite,Phytoseiulus macropilis Fed on the Two-Spotted Spider Mites

“…The original population of T. urticae was collected from the castor oil plant (Ricinus communis L.), and reared continuously on sweet potato plants. The All experiments were conducted in the laboratory at 25±2°C and 65±5% RH and 16:8 L: D h. The experiment was performed on mite eggs using the leaf dip methods (Ibrahim and Yee, 2000). Mite females were left on castor bean leaves to lay eggs for 24 h then removed.…”

“…Several researchers have reported that lifetable parameters of phytophagous and predatory mites were affected by sub-lethal concentrations of pesticides (Ibrahim and Yee, 2000;Hardman et al, 2003). Sanatgar et al (2011) argued that the effect of frequent application of hexythiazox on r m was not significant after spraying of P. persimilis for several generations.…”