The bioactivities of destruxins against whitefly, Bemisia tabaci and its natural enemy, ladybird beetle Serangium japonicum were evaluated. Destruxins A and B (DA and DB) showed insignificant ovicidal, oviposition deterrent and systemic insecticidal activities to B. tabaci; however, DA and DB had certain contact virulence to its nymphs. The LC(50) values of DA at 120h to 2nd, 3rd and 4th instars were 89.8 (95% confidence interval as 85.4-94.4), 199.3 (187.7-211.5) and 270.7 (251.5-291.5)mg/L, while the LC(50)s of DB at 120h were 96.5 (92.0-101.2), 216.7 (203.0-231.2), 359.4 (326.6-395.4)mg/L, respectively. In addition, DA exhibited moderate acute contact toxicities towards S. japonicum, the LC(50)s at 48h were 165.4 (132.3-229.4) and 192.5 (148.1-289.2)mg/L for 4th instar larvae and adults. Furthermore, the results from experiments of residual toxicities of DA towards mortalities of 4th instar larvae and adults, pupation rate, emergence rate, average number of egg/female and hatching rate suggested that DA had minimal effects to the ladybird beetle. Generally, the toxicity decreased about 50% from 1st to 3rd-5th day of post-treatment. Specially, the residual toxicity at 50mg/L and the 7th day post-treatment was down to a value not differing significantly from the control.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.toxicon.2008.10.019 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Enhanced association of whitefly-begomovirus competence with plant-mediated mutualism.
Pest Manag Sci
December 2024
Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects, Zhejiang Key Laboratory of Biology and Ecological Regulation of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou, China.
Background: Vector-borne viruses often manipulate plant defenses against insect vectors, thereby impacting vector population dynamics and in turn virus spread. However, the factors regulating the outcome of insect vector-virus-plant tripartite interactions, such as the feature of virus-vector combinations, are understudied.
Results: Using eight whitefly (Bemisia tabaci)-begomovirus combinations exhibiting different degrees of competence, namely virus transmission efficiency, we examined the association between whitefly-begomovirus competence and plant-mediated mutualism.
First detection of Bemisia tabaci (Hemiptera: Aleyrodidae) MED in Oklahoma and development of a high-resolution melting assay for MEAM1 and MED discrimination.
J Econ Entomol
December 2024
Department of Entomology and Plant Pathology, Oklahoma State University, Stillwater, OK, USA.
The sweetpotato whitefly, Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae), is a polyphagous pest recognized as composed of several cryptic or sibling species. The Middle East-Asia Minor 1 (MEAM1) and the Mediterranean (MED) putative species are invasive and destructive worldwide. The MEAM1 is established throughout the United States, while MED is documented in 27 states.
View Article and Find Full Text PDFPublisher Correction: Enabling biocontained plant virus transmission studies through establishment of an axenic whitefly (Bemisia tabaci) colony on plant tissue culture.
Sci Rep
December 2024
Department of Chemical Engineering, The Pennsylvania State University, University Park, PA, 16802, USA.
SYNCAS based CRISPR-Cas9 gene editing in predatory mites, whiteflies and stinkbugs.
Insect Biochem Mol Biol
November 2024
Laboratory of Agrozoology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Belgium. Electronic address:
Despite the establishment of CRISPR-Cas9 gene editing protocols in a wide range of organisms, genetic engineering is still challenging for many organisms due to constraints including lethality of embryo injection, difficulties in egg/embryo collection or viviparous lifestyles. Recently, an efficient CRISPR-Cas9 method, termed SYNCAS, was developed to genetically modify spider mites and thrips species. The method is based on maternal injection of formulated CRISPR-Cas9 using saponin and BAPC.
View Article and Find Full Text PDFTranscriptional Modulation of Plant Defense Genes by a Bipartite Begomovirus Promotes the Performance of Its Whitefly Vector.
Viruses
October 2024
Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects, Zhejiang Key Laboratory of Biology and Ecological Regulation of Crop Pathogens and Insects, Institute of Insect Sciences, Zhejiang University, Hangzhou 310058, China.
The majority of plant viruses rely on insect vectors for inter-plant transmission. Amid virus transmission, vector-borne viruses such as begomoviruses may significantly modulate host plants in various ways and, in turn, plant palatability to insect vectors. While many case studies on monopartite begomoviruses are available, bipartite begomoviruses are understudied.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!