Synergistic effects of glyphosate formulation herbicide and tank-mixing adjuvants on Pardosa spiders

Niedobová, Jana; Skalský, Michal; Ouředníčková, Jana; Michalko, Radek; Bartošková, Adéla

doi:10.1016/j.envpol.2019.03.031

Cited by 46 publications

(31 citation statements)

References 53 publications

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“…The plant protection product Success4 (a. i. spinosad) after tarsal exposure significantly reduced predation of fourth instar nymphs on aphids 49 . The differences can result from use of different formulations of pesticide products although they comprise the same active ingredient while additional components that could act synergistically were not known 47 . We found significantly more erratic behaviour in the experiments where food was contaminated with spinosad and indoxacarb.…”

Section: Discussionmentioning

confidence: 71%

“…Additionally, pesticides can have sublethal effects on behavioural or physiological processes of organisms beyond possible lethal effects 45 . Sublethal effects on beneficial organisms are sometimes comparable with that of the lethal effect 46,47 . For example, the sublethal effects in the earwig Euborellia annulipes (Lucas) can include reduced predatory activity, lower fertility, and longer development 48 .…”

Section: Introductionmentioning

confidence: 99%

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Forficula auricularia (Dermaptera) in orchards: Monitoring seasonal activity, the effect of pesticides, and the perception of European fruit growers on its role as a predator or pest

Niedobová

Skalský

Ouředníčková

et al. 2020

Pest Management Science

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BACKGROUND We investigated several aspects that could affect the role of the European earwig (Forficula auricularia) as a generalist predator in orchards: (i) seasonal activity in apple orchards, (ii) effectiveness of two cardboard trap types (roll vs tape) to enhance earwig densities, (iii) the effect of pesticides (chlorpyrifos‐methyl, spinosad, indoxacarb, spirotetramat, pirimicarb, sulphur, fluopyram tebuconazole) on earwig survival and behaviour, and (iv) the perception of European fruit growers of the earwigs’ role as a predator or pest. RESULTS The highest activity of earwigs in apple trees was observed in summer. Roll traps were a more effective capture method than tape traps. The roll traps also significantly increased earwig abundances in trees. Only the earwigs exposed to the insecticides indoxacarb, spinosad and chlorpyrifos‐methyl had significantly higher mortality and more erratic behaviour than earwigs from the control treatment. Earwigs from orchards with long‐term (>10 years) application of chlorpyrifos‐methyl had significantly lower mortality when exposed to this insecticide than earwigs from nonsprayed orchards. The fruit growers perceived earwigs as natural enemies of aphids and psyllids but also as pests. However, they regarded the damage caused by earwigs as economically unimportant without the necessity for management against them. CONCLUSION Fruit growers can increase earwig densities by installing rolled cardboard bands around trees. The highest seasonal activity of European earwigs coincides with applications of insecticides in orchards. This could disturb the earwigs' potential to suppress pest populations because several insecticides widely used in orchards have lethal and sublethal effects on earwigs even though they seem to develop some degree of pesticide resistance over time. © 2020 Society of Chemical Industry

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Section: Discussionmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Forficula auricularia (Dermaptera) in orchards: Monitoring seasonal activity, the effect of pesticides, and the perception of European fruit growers on its role as a predator or pest

Niedobová

Skalský

Ouředníčková

et al. 2020

Pest Management Science

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“…This study highlights that, for a better use of glyphosate, the addition of an adjuvant could be beneficial, not only for the herbicide efficacy against weeds, but also for the environment due to lower applied doses of herbicide. Nevertheless, further research should be conducted on the effects of glyphosate formulations with the addition of surfactants to ecosystems, because these substances could be environmentally detrimental [32].…”

Section: Discussionmentioning

confidence: 99%

Effect of Adjuvant on Glyphosate Effectiveness, Retention, Absorption and Translocation in Lolium rigidum and Conyza canadensis

Palma-Bautista

Vázquez-García

Travlos

et al. 2020

Plants

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Glyphosate retention, absorption and translocation with and without adjuvant were examined in Lolium rigidum and Conyza canadensis in greenhouse and laboratory settings to develop an understanding of the influence of the selected adjuvant on glyphosate activity. Tests on whole plants show that the dose of herbicide needed to reduce dry weight by 50% (GR50) or plant survival (LD50) decreases by mixing glyphosate and adjuvant to 22%–24% and 42%–44% for both populations of L. rigidum and C. canadensis, respectively. This improvement in efficacy could be attributed to the higher herbicide retention and lower contact angle of the glyphosate + adjuvant drops on the leaf surface compared to the glyphosate solution alone. Plants of both species treated with 14C-glyphosate + adjuvant absorbed more glyphosate compared to non-adjuvant addition. Furthermore, the movement of the herbicide through the plant was faster and greater with the adjuvant. Our results reveal that the use of adjuvants improves the effectiveness of glyphosate in two of the most important weeds in agricultural crops in Mediterranean countries.

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“…Of significance, but not discussed here are the harmful health effects of glyphosate under occupational exposure (see, for example, [16,113]). In addition, it is noteworthy to remember that tank mixing herbicides with further adjuvants (most often surfactants) may have more severe or modified effects on non-target organisms than the herbicide formulations alone [114].…”

Section: Some Further Overlapping Issuesmentioning

confidence: 99%

Insufficient risk assessment of herbicide-tolerant genetically engineered soybeans intended for import into the EU

Miyazaki¹,

Bauer-Panskus²,

Bøhn

et al. 2019

Environ Sci Eur

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The introduction of herbicide-tolerant (HT) genetically engineered (GE) soybeans has raised new challenges for the European risk assessment of imported food and feed. Food and feed products derived from these plants may show specific patterns of chemical residues and altered nutritional composition. Furthermore, there has been a substantial increase in the usage of herbicides in soybean production due to the emergence of resistant weeds. This concerns particular glyphosate-based herbicides and also other herbicides. In this review, we give an overview of available data regarding glyphosate application on HT GE soybeans in North and South America. We have further compared this data with herbicide applications in experimental field trials conducted by the industry. We conclude that field trials carried out for risk assessment purposes do not generally represent the real agronomic conditions in commercial HT GE plant cultivation. In most cases, neither the applied dose nor the number of applications match real conditions. This finding is especially relevant for risk assessment since a review of relevant publications shows that the amount and timing of spraying glyphosate as a complementary herbicide onto HT GE plants can impact their composition; this is relevant to EFSA comparative risk assessment of GMOs. Further, closely related issues were identified that overlap with EU GMO and pesticide regulation, but are not currently considered. These issues concern indirect, cumulative and combinatorial effects as well as the assessment of mixed toxicity. Consequently, current risk assessment practice for HT GE plants cannot be considered to fulfil EU regulatory standards which require the safety of food and feed to be demonstrated. It is much more likely that concerns about the health risks of HT GE plant material used for food and feed have been underestimated. We therefore conclude that the EU risk assessment of food and feed derived from HT GE plants needs substantial improvement.

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Synergistic effects of glyphosate formulation herbicide and tank-mixing adjuvants on Pardosa spiders

Cited by 46 publications

References 53 publications

Forficula auricularia (Dermaptera) in orchards: Monitoring seasonal activity, the effect of pesticides, and the perception of European fruit growers on its role as a predator or pest

Forficula auricularia (Dermaptera) in orchards: Monitoring seasonal activity, the effect of pesticides, and the perception of European fruit growers on its role as a predator or pest

Effect of Adjuvant on Glyphosate Effectiveness, Retention, Absorption and Translocation in Lolium rigidum and Conyza canadensis

Insufficient risk assessment of herbicide-tolerant genetically engineered soybeans intended for import into the EU

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