Bioactivity of essential oils from Croton grewioides and its major compounds: toxicity to soybean looper Chrysodeixis includens and selectivity to the predatory stink bug Podisus nigrispinus
Natural biological control is a key factor that ensures the regulation of insect pest populations in agroecosystems. However, the indiscriminate use of pesticides has compromised this environmental service. Thus, the search for environmentally safe pesticides is an increasing requirement for sustain...
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| Published in: | Environmental science and pollution research international Vol. 30; no. 7; pp. 18798 - 18809 |
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| Main Authors: | , , , , , , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Berlin/Heidelberg
Springer Berlin Heidelberg
01-02-2023
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| Subjects: | |
| Online Access: | Get full text |
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| Summary: | Natural biological control is a key factor that ensures the regulation of insect pest populations in agroecosystems. However, the indiscriminate use of pesticides has compromised this environmental service. Thus, the search for environmentally safe pesticides is an increasing requirement for sustainable food production. In this study, we analyzed the toxicity of essential oils from two accessions (CGR112 and CGR126) of
Croton grewioides
and its major compounds, methyl eugenol and eugenol, on the soybean pest
Chrysodeixis includens
. In addition, we investigated the sublethal effects of these compounds on the predatory bug
Podisus nigrispinus
, analyzing its developmental, reproduction and life table parameters. Essential oils and their major compounds were toxic to
C. includens
and
P. nigrispinus
. In general, the presence of eugenol made the essential oil more toxic to the pest and selective to the natural enemy. Eugenol was the most toxic compound for 2
nd
instar larvae of
C. includens
at LD
50
, followed by CGR126 essential oil from
C. grewioides
which was equally toxic at higher doses. The estimated lethal times for essential oils to cause mortality in 50% of the population of
C. includens
were less than 15 h. There was selectivity of the essential oil of CGR126 accession of
C. grewioides
at lethal doses above 90%. Although the treatments showed little effect on the development of
P. nigrispinus
, body mass and reproductive parameters were negatively affected, with the exception of the essential oil of CGR126 accession of
C. grewioides
. The essential oil of
C. grewioides
may be a promising active ingredient for the synthesis of new insecticides, which are efficient against
C. includens
and at the same time are safer for the natural enemy
P. nigrispinus
.
Graphical abstract |
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| ISSN: | 1614-7499 1614-7499 |
| DOI: | 10.1007/s11356-022-23414-w |