Effects of Neem-Fed Prey on the Predacious Insects Harmonia conformis (Boisduval) (Coleoptera: Coccinellidae) and Mallada signatus (Schneider) (Neuroptera: Chrysopidae)

Qi, Baoying; Gordh, Gordon; Gimme, Walter

doi:10.1006/bcon.2001.0965

Cited by 60 publications

(26 citation statements)

References 13 publications

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“…Azadirachtin, the active ingredient of NeemAzal, is an ecdysone antagonist that disrupts insect molting (Tomlin 2000). NeemAzal was found to be only slightly harmful to Geocoris bugs (Myers et al 2006), Harmonia beetles, and Mallada lacewings (Qi et al 2001). Podisus bugs had, however, slightly reduced survival and reproduction (Viñuela et al 2000).…”

Section: Discussionmentioning

confidence: 97%

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The negative effect of some selective insecticides on the functional response of a potential biological control agent, the spider Philodromus cespitum

2010

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The impact of five selective insecticides on the functional response of a potential biological control agent, the spider Philodromus cespitum (Walckenaer) (Araneae: Philodromidae), was studied in the laboratory. This spider is the most abundant beneficial arthropod on trees in commercial orchards in central Europe. We expected that selective insecticides applied at the recommended doses would have no effect or a negligible effect on the spiders' performance. Our results showed that the mortality of spiders resulting from residual uptake of the chemicals differed among insecticides. Dimilin, NeemAzal, Mospilan, and Integro caused mortality of less than 10%, while SpinTor caused mortality of 17%. All five preparations can be considered harmless in terms of mortality in comparison with Decis, which caused 80% mortality. Exposure to residues of NeemAzal, SpinTor, and Dimilin resulted in a significantly lower predation rate than the control. The lowest predation rate was observed in spiders treated with SpinTor. These results imply that the natural pest control provided by P. cespitum spiders can be weakened by the application of SpinTor, NeemAzal, and Dimilin. On the other hand, the functional response was not significantly affected by the application of Integro and Mospilan. Therefore, these two insecticides are recommended for use in the integrated pest management (IPM) of orchards.

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Section: Discussionmentioning

confidence: 97%

“…For example, a stronger functional response was seen in Pardosa wolf spiders (Wang et al 2006) and increased consumption was seen in Mallada (Qi et al 2001). These results can be explained by the general theory of hormesis (Luckey 1963;Stebbing 1982) or by the disruption of predator avoidance ability of prey.…”

Section: Discussionmentioning

confidence: 99%

The negative effect of some selective insecticides on the functional response of a potential biological control agent, the spider Philodromus cespitum

2010

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“…Similarly, neem had no effect on survival and fecundity of O. laevigatus exposed via direct contact or by ingestion of infected eggs of Ephestia kuehniella Zeller ( Van de Veire et al 1996;Angeli et al 2005). Qi et al (2001) found that neem treatments were not toxic to adult ladybird [Harmonia conformis (Boisduval) (Coleoptera: Coccinellidae] and Mallada signatus (Schneider) (Neuroptera: Chrysopidae) larvae exposed via feeding. However, the metamorphosis and pupal survival of M. signatus were negatively affected.…”

Section: Discussionmentioning

confidence: 99%

Influences of Botanical Pesticides and Biological Agents on Orius Laevigatus - Frankliniella Occidentalis Dynamics Under Greenhouse Conditions

Bonsignore¹,

Vacante²

2012

Journal of Plant Protection Research

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Abstract:We assessed the influence of nine biopesticides on adults and larvae of western flower thrips (WFT), Frankliniella occidentalis (Pergande) and its predator, the anthocorid Orius laevigatus (Fieber) under Mediterranean greenhouse conditions. Trials were carried out in a strawberry crop where both species had naturally established. Foliar sprays were applied weekly for one month. Treatments did not provide sufficient control of larval and adult F. occidentalis. The negative effects on the dynamics of the predator were evident only with the use of some specific products. The botanical insecticides rotenone and neem, and the nematode Steinernema feltiae (Filipjev) reduced O. laevigatus numbers, and these effect are evident in the adult stage of O. laevigatus. Such products have determined a reduction of the population of the predator from the first treatments even if the incidence was not very high. We conclude that the use of some botanical pesticides and nematodes against WFT is uneconomical and possibly disadvantageous where there is an established predator-prey population.

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“…The astonishment of such results relies on the fact that the majority of studies indicate reductions in the consumption of insecticidetreated prey [e.g. lambda-cyhalothrin, cypermethrin (Thornham et al 2007) and dimethoate on C. septempunctata (Singh et al 2004) and endosulfan on H. conformis (Qi et al 2001)] and few had shown no changes on the consumption rates of coccinellids on insecticide-treated prey, such as pirimicarb, dimethoate and chlorpyrifos on C. septempunctata (Thornham et al 2007) and azadirachtin on H. conformis (Qi et al 2001), but no other study have shown an increase in the consumption of insecticide-treated prey. Fig.…”

Section: Discussionmentioning

confidence: 99%

Voracity of Coccinella undecimpunctata: effects of insecticides when foraging in a prey/plant system

2011

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Coccinella undecimpunctata L. is a euryphagous predator established in Azores that offers interesting potential as a control agent in the context of integrated pest management (IPM). However, to further develop IPM against aphids, it is important to evaluate the effects that insecticides might have on voracity. Thus, we proposed to evaluate the effects of pirimicarb and pymetrozine on the voracity of 4th instar larvae and adults of C. undecimpunctata, under distinct scenarios of exposure to chemicals within a prey/plant system. Voracity of C. undecimpunctata was not significantly affected by pirimicarb or pymetrozine when treatments were directly sprayed on the predator; however, when insecticides were sprayed on the prey/plant system, the predator's voracity was significantly increased. Results suggest that C. undecimpunctata does not detect the insecticide on the aphids and indicate that the increase in voracity may be due to a decrease in the mobility of insecticide-treated aphids, since their capture should be easier than highly mobile non-treated prey. The consequences of such increase in the voracity for IPM programs are discussed.

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Effects of Neem-Fed Prey on the Predacious Insects Harmonia conformis (Boisduval) (Coleoptera: Coccinellidae) and Mallada signatus (Schneider) (Neuroptera: Chrysopidae)

Cited by 60 publications

References 13 publications

The negative effect of some selective insecticides on the functional response of a potential biological control agent, the spider Philodromus cespitum

The negative effect of some selective insecticides on the functional response of a potential biological control agent, the spider Philodromus cespitum

Influences of Botanical Pesticides and Biological Agents on Orius Laevigatus - Frankliniella Occidentalis Dynamics Under Greenhouse Conditions

Voracity of Coccinella undecimpunctata: effects of insecticides when foraging in a prey/plant system

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