Insecticidal activity of isolated essential oils from three medicinal plants on the biological control agent, Habrobracon hebetor Say (Hymenoptera: Braconidae) (original) (raw)
Related papers
2018
Habrobracon hebetor Say is an important ectoparasitoid wasp that can control Pyralidae and Noctuidae pests in agricultural crops. In this research, the effects of Allium sativum L., Rosmarinus officinalis L., Piper nigrum L., Salvia officinalis L. and Glycyrrhiza glabra L. essential oils were investigated on the functional response of H. hebetor to its host. The GC-MS analysis showed that tetracosamethyl cyclododeca siloxan, alpha-pinene, caryophyllene, beta-thujone and aristolene were major constituents of mentioned essential oils, respectively. In the experiments; the mated females of H. hebetor (under 24 h old) were exposed to sublethal concentrations (LC30) of isolated essential oils for 24 h with fumigant exposure method. In the control, the treatment was performed by using distilled water. Then, six treated wasps were selected randomly to densities of 2, 4, 8, 16, 32 and 64 Ephestia kuehniella Zeller 5 th instar larvae for 24 h under 25 ± 1 °C, 60 ± 5% RH and photoperiod of 16...
Acta Biologica Szegediensis
Salvia officinalis L. and Glycyrrhiza glabra L. are two valuable medicinal plants from Kermanshah province in Iran. In this study, chemical analyses of their essential oils were performed by gas chromatography-mass spectrometry and the effects investigated on functional response of Habrobracon hebetor Say on larval stage of Sitotroga cerealella Olivier. Accordingly, emerged females of H. hebetor were treated by LC30 of the isolated essential oils for 24 h. Then, six wasps were accidentally selected and introduced to densities of host larvae for 24 h. The results showed that naphthalene, decahydro-4a-methyl and alpha-thujone were dominant compounds in both essential oils, respectively. Holling model (1959) by using regression analyses confirmed functional response type III in the control wasps and type II in both essential oils treatments. The highest and lowest attack rates were observed in the control wasps (0.0443 ± 0.00278 h-1) and S. officinalis treatment (0.0349 ± 0.00257 h-1),...
The potential of botanical essential oils for insect pest control
Integrated Pest Management Reviews, 1997
Today,Insect Pest management (IPM) has to face up to the economic andecological consequences of the use of pest control measures.Fifty years of sustained struggle against harmful insects usingsynthetic and oil-derivative molecules has produced perversesecondary effects (mammalian toxicity, insect resistance andecological hazards). The diversification of the approachesinherent in IPM is necessary for better environmental protection.Among the alternative strategies, the use of
Biological Activities of Essential Oils on Insects
Synthetic pesticides have been considered the most effective and accessible means to control insect pests. However, there is a global concern about synthetic insecticides negative impact on ozone, environmental pollution, toxicity to non-target organisms, and pesticidal residues. The adverse effects of synthetic pesticides have amplified the need for effective and biodegradable pesticides. Essential oils and their constituents have been considered as natural agents against insect pests. Essential oils are renewable, non-persistent in the environment and relatively safe to non-target organisms and humans. This chapter discusses the insecticidal, feeding deterrence, repellency, oviposition and progeny production, growth inhibition and even attractant activities of these compounds to a wide range of insect pests. Results demonstrated that essential oils and their main components could be applicable to the management of insect pests to decrease ecologically detrimental effects of synthe...
A review on prospects of essential oils as biopesticide in insect-pest management
Journal of Pharmacognosy and Phytotherapy, 2009
Plant essential oils in general have been recognized as an important natural source of pesticides. They represent a market estimated at US $700.00 millions and a total world production of 45,000 tons. The genera capable of elaborating the compounds that constitute essential oils are distributed in a limited number of families but the widespread range of activities of essential oils is being considered for both industrial and household uses. Essential oil compounds and their derivatives are considered to be an alternative means of controlling many harmful insects and their rapid degradation in the environment have increased specificity that favours beneficial insects. Essential oils based commercial products are being developed for a wide range of human and animal uses, including pest control. Unfortunately, most of the natural products used for pest control, are not always subject to rigorous testing. In view of the above points, the present paper focuses on the work done in the field of essential oils as biopesticides with special emphasis on essential oil chemistry, extraction, pesticidal properties, mode of action, synergism, phytotoxicity, commercialization prospects, safety aspects, socioeconomic impacts and sustainability.
Alexandria Journal of Agricultural Sciences
The effect of six plant essential oils against three stored grain insects, Sitophilus oryzae, Rhizopertha dominica and Tribolium castaneum were studied under laboratory conditions. The tested oils are namely, fennel oil (Foeniculum vulgare), caraway oil (Carum carvi), cinnamon oil (Cinnamomum verum), citronella oil (Cymbopogon winterianus), nutmeg oil (Myristica fragrans) and black cumin oil (Nigella sativa). The result showed that increasing of the oil concentration and exposure times significantly increased the mortality percentage. Generally, the toxicity of essential oils at all tested concentrations increased with the increasing of exposure time. So, the results indicated that toxicity of all tested essential oil against the three stored grain insects at the high concentration was recorded high mortality faster than low concentration. The tested essential oils significantly decreased the different haemocyte counts in tested insects, cinnamon oil markedly increased the haemocyte surface areas in the tested insects especially the surface area of oenocytoides in T. castaneum. The recorded results indicate that the essential oils of fennel, caraway, cinnamon and citronella could be applicable to the management of S. oryzae, R. dominica and T. castaneum adults.
Natural Product Communications
In this study, insecticidal effects of the essential oils obtained from plants Achillea biebersteinii Afan., Origanum onites L., Rosmarinus officinalis L., Salvia pratensis L., Satureja hortensis L., Tanacetum balsamita L. on American White Butterfly [Hyphantria cunea Drury, Lepidoptera: Arctiidae] were tested in laboratory conditions. In this context, larvae of the 3rd and 4th periods of H. cunea were exposed to essential oils at doses of 10, 15 and 20 μl/petri for 24, 48, 72 and 96 hours. All of the essential oils used in the study caused mortality at different rates; the highest effect was obtained with the essential oil from O.onites with a mortality rate of 87.7%. The oils from R. officinalis (74.4%), A biebersteinii. (74.4%), S. hortensis (68.8%), T. balsamita (34.4%), and S. pratensis (30.0%) followed this in this order. As a results of the dose effect tests conducted in the second part of the study, it was determined that T. balsamita (LD 50 =7.1 ppm) and O. onites (LD 90 =23.2 ppm) were the most toxic plant essential oils when lethal concentration values (LD 50 and LD 90) were considered. It was found that the essential oils of R. officinalis (LD 50 = 86.1 ppm) and S. hortensis (LD 90 =62722.1 ppm) have the lowest toxic effect. The results obtained show that the essential oils from A. biebersteinii, O. onites, and R. officinalis can be used in the fight against H. cunea.
Neotropical Entomology, 2016
Plant essential oils have been recognized as significant natural resources for insecticides. Herein, we have assessed the toxicity of the essential oil of Piper aduncum (Piperaceae) against Euschistus heros (F.) (Hemiptera: Pentatomidae), a key soybean pest in Neotropical America. In addition, we have assessed its effect on the performance of egg parasitoids. The essential oil was obtained from the leaves of P. aduncum via hydrodistillation. Subsequently, bioassays of the concentration response to eggs (contact and immersion methods), nymphs, and adults (topical application) were conducted, to assess the lethal effects on the stink bug. We also evaluated the performance of parasitism and adult emergence of egg parasitoids, when the host eggs were treated with essential oil. In the egg bioassay, both exposure methods were efficient for unviable eggs (immersion LC 50 = 15.64 mg mL −1 ; contact LC 50 = 21.29 mg mL −1), with the highlight on the immersion method. The bioassay with nymphs indicated a higher toxicity of essential oil, with lower concentrations (LC 50 = 11.37 mg mL −1) being required to cause the death of insects. For adults, a reduction in survival of insects was observed, and consequently, there was a reduction in the number of individuals in the next generation. Although the essential oil was toxic to E. heros, it exhibited lower toxicity for egg parasitoids, as there was no effect on parasitism and the emergence of wasps. We discuss likely explanations for such selectivity. In summary, we found that the essential oil was promising for the control of E. heros, because it caused deleterious effects at all development stages of the stink bug and had no effect on parasitism and emergence of the egg parasitoids, which suggested compatibility with biological control.
Molecules
Haematobia irritans is a cosmopolitan obligate blood-feeding ectoparasite of cattle and is the major global pest of livestock production. Currently, H. irritans management is largely dependent on broad-spectrum pesticides, which has led to the development of insecticide resistance. Thus, alternative control methods are needed. Essential oils have been studied as an alternative due to their wide spectrum of biological activities against insects. Thus, the main aim of this study was to evaluate the insecticidal, repellent and antifeedant activity of the essential oils from Blepharocalyx cruckshanksii leaves and Pilgerodendron uviferum heartwood against horn flies in laboratory conditions. The composition of the essential oils was analyzed using gas chromatography coupled to mass spectrometry. Accordingly, α-pinene (36.50%) and limonene (20.50%) were the principal components of the B. cruckchanksii essential oil, and δ-cadinol (24.16%), cubenol (22.64%), 15-copaenol (15.46%) and δ-cadi...