Insecticidal Activity of Some Major Essential Oil Components against Metopolophium dirhodum and Its Predators

Essential oils (EOs) are plant metabolites with important insecticidal effects. Nevertheless, information on the efficacy of the major substances on aphids and their natural enemies is still missing. The objective of this paper is, therefore, to identify the efficacy of selected EO majority substanc...

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Published inPlants (Basel) Vol. 13; no. 13; p. 1863
Main Authors Pavela, Roman, Novák, Matěj
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 05.07.2024
Subjects
Aphidoletes aphidimyza
binary mixture
Binary mixtures
Biodegradation
Biomass
botanical pesticides
Carvacrol
Citronellol
Effectiveness
Essential oils
Females
Fertility
Insecticides
Insects
Isoeugenol
Larvae
Linalool
Metabolites
Metopolophium dirhodum
Mortality
Natural enemies
Oils & fats
Pesticides
Predators
synergism aphids
terpenoids
Toxicity
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Summary:Essential oils (EOs) are plant metabolites with important insecticidal effects. Nevertheless, information on the efficacy of the major substances on aphids and their natural enemies is still missing. The objective of this paper is, therefore, to identify the efficacy of selected EO majority substances—β-citronellol, carvacrol, isoeugenol, and linalool, including their binary mixtures—on the mortality and fertility of the aphid Metopolophium dirhodum, an important cereal pest. The best efficacy was proven for the binary mixture of β-citronellol and linalool (1:1 ratio), for which the estimated LC50(90) is 0.56(1.58) mL L−1. This binary mixture applied in sublethal concentrations significantly reduced aphid fertility. It was found that the phenomenon can be attributed to β-citronellol, as the females treated with LC30 laid 45.9% fewer nymphs, on average, compared to the control. Although β-citronellol and linalool, including their 1:1 mixture, showed very good efficacy on aphid mortality, they were, on the other hand, very friendly to the larvae of Aphidoletes aphidimyza and Chrysoperla carnea, which are important aphid predators. Based on our results, the newly discovered synergically acting binary mixture β-citronellol/linalool can be recommended as an efficient substance suitable for the further development of botanical insecticides used against aphids.
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ISSN:2223-7747
2223-7747
DOI:10.3390/plants13131863