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20 results for “Insecticidal activity”
Fig. 2 in Insecticidal activity of the methanol extract of Pronephrium megacuspe (Thelypteridaceae) and its active component on Solenopsis invicta (Hymenoptera: Formicidae)
Fig. 2. The effect of methanol extract, ethyl acetate fraction, and compound 26 293 (phenol-3-O-beta-D-glucoside) from Pronephrium megacuspe on the walking ability of 294 Solenopsis invicta micrergates. Each data point represents the mean ± SE of 3 replicates. Each 295 replicate contained 10 tested ants. CK = control.
Fig. 3 in Insecticidal activity of the methanol extract of Pronephrium megacuspe (Thelypteridaceae) and its active component on Solenopsis invicta (Hymenoptera: Formicidae)
Fig. 3. The effect of methanol extract, ethyl acetate fraction, and compound 26 298 (phenol-3-O-beta-D-glucoside) from Pronephrium megacuspe on the clinging ability of 299 Solenopsis invicta macrergates. Each data point represents the mean ± SE of 3 replicates. Each 300 replicate contained 10 tested ants. CK = control.
Fig. 1 in Insecticidal activity of the methanol extract of Pronephrium megacuspe (Thelypteridaceae) and its active component on Solenopsis invicta (Hymenoptera: Formicidae)
Fig. 1. The effect of methanol extract, ethyl acetate fraction, and compound 26 288 (phenol-3-O-beta-D-glucoside) from Pronephrium megacuspe on the walking ability of 289 Solenopsis invicta macrergates. Each data point represents the mean ± SE of 3 replicates. Each 290 replicate contained 10 tested ants. CK = control.
Fig. 2 in Insecticidal activity of three plant extracts against adult Ips typograpgus L. under laboratory conditions
Fig. 2. Concentration–mortality response curves from the probit analyses testing insecticide effects of plant extracts against adults ofIps typographus in laboratory bioassays.
Fig. 1 in Insecticidal activity of three plant extracts against adult Ips typograpgus L. under laboratory conditions
Fig. 1. Mean cumulative mortality* of Ips typographus adults four days after treatments with different concentrations of three plant extracts in laboratory bioassays. The error bars represent the standard errors of means. (*corrected for a natural mortality in the control)
Fig. 3 in Insecticidal activity of three plant extracts against adult Ips typograpgus L. under laboratory conditions
Fig. 3. Kaplan-Meier estimates of the survival curves for Ips typographus adults treated with the plant extracts (2.5%) in laboratory bioassays.
Effect of insecticide treatment on Salix interior stem tannin activity and elemental composition.
This dataset contains information on stem chemistry of Salix interior within experimental plots on the Tanana River. There are 6 permanent plots, each of which contains two fenced subplots and two unfenced subplots. Subplots are sprayed with either insecticide (insect-treated subplots) or water (controls) annually. This particular dataset contains chemistry data for leaves collected from insecticide-treated and control subplots only within fenced subplots. The intent was to measure the effect of insect herbivory on chemistry in the absence of browsing.
Insecticidal activity of Lantana camara extract oil on controlling maize grain weevils
<p>Currently farmers are faced by serious post-harvest problems from weevils especially in storage of grains. When grains exposed to insects they become less marketable and loss quality of grain. In this study the insecticidal property of methanol, ethanol and ethyl acetate extracted oil from Lantana Camara leaf for controlling of maize weevils, Sitophilus Zeamais were studied. Gas Chromatography-Mass spectrometry (GC-MS) and Fourier transform infrared spectroscopy (FT-IR) was used to identify the chemical composition and Functional group of solvent extracted oil respectively. Adult weevil's repellency and mortality were studied by the effect of extract oil concentration at 0% (w/w), 2% (w/w), 3% (w/w), 5% (w/w), 7% (w/w), and 10% (w/w) to weight of grain maize and exposed days. Repellency effect was also conducted at 6, 12 and 24 h at different concentration oil. The number of weevil's death increases significantly as exposed time increases. The extracted oil by the three-solvent fraction had direct repellent and toxic effect to the weevil. From all treatment applied, extracted by methanol fraction had showed highest percentage mortality (74%). The lowest mortality rate was observed in ethyl acetate fraction oil (26%), at 2% (w/w) concentration. The effect of lantana Camara leaf powder and extracted oil on repellency and mortality was showed directly proportional to concentration dosage.</p>
Conidia productivity and whitefly insecticidal activity of Beauveria bassiana JEF-507
<p>Silverleaf whitefly, <em>Bemisia tabaci</em> (Hemiptera: Aleyrodidae), is a destructive insect pest damaging to diverse crops by vectoring several plant pathogenic viruses, which consequently causes economic losses in crop production. As the resistance of whiteflies to chemical insecticides is increasing, this study aims to investigate the potential of entomopathogenic fungi as an alternative. A total of 72 entomopathogenic fungal isolates, collected from soils using <em>Tenebrio molitor</em> larvae as an insect baiting method, were assessed for their virulence against 2<sup>nd</sup> nymphs of whitefly. Their virulence was assayed by dipping whitefly-infested tomato leaves in fungal conidia suspensions at 1.0 × 10<sup>7</sup> conidia/ml. Among the tested isolates, two isolates of <em>Beauveria bassiana</em> JEF-462 and JEF-507 showed high virulence. In the assessment of virulence depending on conidia concentrations, the estimated LC<sub>50</sub> values for JEF-462 and JEF-507 were similarly 8.7~14.0 × 10<sup>7</sup> conidia/ml. However, <em>B. bassiana</em> JEF-507 showed higher conidial productivity and thermotolerance on most of tested 12 grain substrates than<em> </em><em>B. bassiana</em> JEF-462, and millet was the most suitable grain substrate. Additionally, siloxane as a surfactant was able to sufficiently exhibit the insecticidal activity of JEF-507 against whitefly nymphs compared to other surfactants. In a pot-based greenhouse trial, JEF-507 showed higher control efficacy than chemical insecticides, dinotefuran and spinetoram. This work suggests that <em>B. bassiana</em> JEF-507 could be competitively used as a biopesticide to control silverleaf whiteflies whilst overcoming current resistance issues. The JEF-507 isolate has been registered in Korea, 2022 and successfully commercialized as the name of Chongchae-Stop<sup>®</sup> in this local market to control whitefly and thrips.</p>
Insecticidal activity of Lantana camara extract oil on controlling maize grain weevils
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Conidia productivity and whitefly insecticidal activity of Beauveria bassiana JEF-507
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Enhanced insecticidal activity of isoparaffin by ozone as an adjuvant
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Insecticidal activity of Beauveria bassiana against Monochamus alternatus adults
<p><em><span>Monochamus alternatus</span></em><span> is a major forest pest that spreads pine wilt disease in pine trees as a vector of pine wilt nematodes. Chemical insecticides used as fumigants to control overwintering <em>M. alternatus</em> in forests are highly toxic to the environment, so we investigated entomopathogenic fungus <em>Beauveria bassiana</em> ERL836 as an eco-friendly and alternative material to control overwintering <em>M. alternatus</em>. In this work, we evaluated the insecticidal activity of <em>B. bassiana</em> ERL836 against <em>M. alternatus</em> adults, the possibility of fungal colonization on pine tree bark, and finally the control efficacy of fungal pre-treatment on pine tree logs against emerging M. alternatus adults in semi-field and field conditions. <em>M. alternatus</em> adults were killed on the pine trees logs pre-treated with the <em>B. bassiana</em> ERL836. White conidia were observed not only on the surface of the dead adults but also on the pine tree logs, suggesting that the adults were killed by the fungus on the pine. A formulated ERL836 powder treatment on larvae-infested pine logs showed high insecticidal activity against adults, similar to that with the fungal powder suspension treatment, but we demonstrated that using the fungal powder was simpler than using the suspension in field conditions. Even in the field condition, the fungal powder treatment showed high insecticidal activity against <em>M. alternatus</em> adults, which we attribute to its ability to maintain fungal activity for a long time in field conditions by covering the pine tree logs with a film during overwintering. We confirmed that the risk that fungus-infected <em>M. alternatus</em> adults would spread the fungus to other non-target forest insects was low. Thus, even a high-concentration treatment in a specific area is unlikely to transmit the fungus outside that area, so it can be safely used to control this pine wilt nematode vector in forest ecosystems.</span></p>
Insecticidal activity of Beauveri bassiana ERL1170-egfp against Tribolium castaneum
<p class="MsoBodyText"><strong><span>Background</span></strong></p> <p class="MsoBodyText"><span>Beauveria bassiana</span><span> is one of the commercially available entomopathogenic fungi (EPF), and a number of isolates with high virulence and broad host spectrum have been used to control agricultural and forest pests. Although the functional importance of genes in EPFs' pathogenesis have been extensively studied, the precise ultrastructural mechanism of the fungal infection, particularly penetration of the host insect cuticles, is not well understood. </span></p> <p class="MsoBodyText"><strong><span>Results</span></strong></p> <p class="MsoBodyText"><span>In this study, we investigated the morphology and ultrastructure of the larval cuticle of the red flour beetle, </span><span>Tribolium castaneum</span><span>,</span><span> after treatment with </span><span>B. bassiana </span><span>ERL1170 expressing an enhanced green fluorescent protein (</span><span>Bb</span><span>-eGFP). The </span><span>Bb</span><span>-eGFP showed high virulence against the larvae, with approximately 90% mortality at 48 h after treatment (HAT) and 100% at 72 HAT under our infection conditions. In </span><span>these</span><span> larvae, the regions of the body wall with flexible cuticles, such as the ventral and ventrolateral thorax and abdomen, became darkly melanized, but there was little to none melanization in the rigid dorsal cuticular structures. Confocal microscopy and transmission electron microscopy (TEM) indicated that germinated conidia on the surface of the larval cuticle were evident at 6 HAT, which formed penetration pegs and began to penetrate the several cuticle layers/laminae by 12 HAT. The penetration pegs then developed invading hyphae, some of which passed through the cuticle and reached the epidermal cells by 24 HAT. The larval cuticle was aggressively and extensively disrupted by 48 HAT, and a number of outgrowing hyphae were observed at 72 HAT. </span></p>
Efficacy of Two Dual Active Ingredient Long Lasting Insecticidal Nets for Control of Malaria Transmitted by Pyrethroid Resistant Vectors in Benin
ClinicalTrials.gov study NCT03931473. IPD Sharing: NO. Countries: 1. Publications: 7.
Insecticidal activity of Beauveria bassiana against Monochamus alternatus adults
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Toxicity effect of five insecticides on the development and enzyme activities of Trichogramma ostriniae
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Insecticidal activity of Beauveri bassiana ERL1170-egfp against Tribolium castaneum
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Insecticidal activity of chitinases from Xenorhabdus nematophila and its relationship with the toxin complex
<p>Supplementary Materials</p>
Data from: Semisynthesis and insecticidal activity of some novel fraxinellone-based thioethers containing 1,3,4-oxadiazole moiety
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