The role of B-type esterases in conferring insecticide resistance in the tobacco whitefly,Bemisia tabaci (Genn)

2000 ◽  
Vol 56 (10) ◽  
pp. 867-874 ◽  
Author(s):  
Frank J Byrne ◽  
Kevin J Gorman ◽  
Matthew Cahill ◽  
Ian Denholm ◽  
Alan L Devonshire
Keyword(s):  
Insecticide Resistance ◽  
Bemisia Tabaci ◽  
Tobacco Whitefly

Insecticide resistance and biotype status of populations of the tobacco whitefly Bemisia tabaci (Hemiptera: Aleyrodidae) from Turkey

2008 ◽  
Vol 27 (3-5) ◽  
pp. 600-605 ◽  
Author(s):  
Cem Erdogan ◽  
Graham D. Moores ◽  
M. Oktay Gurkan ◽  
Kevin J. Gorman ◽  
Ian Denholm
Keyword(s):  
Insecticide Resistance ◽  
Bemisia Tabaci ◽  
Tobacco Whitefly

Pyrethroid and organophosphate resistance in the tobacco whitefly Bemisia tabaci (Homoptera: Aleyrodidae)

1995 ◽  
Vol 85 (2) ◽  
pp. 181-187 ◽  
Author(s):  
Matthew Cahill ◽  
Frank J. Byrne ◽  
Kevin Gorman ◽  
Ian Denholm ◽  
Alan L. Devonshire
Keyword(s):  
Insecticide Resistance ◽  
Bemisia Tabaci ◽  
Esterase Activity ◽  
Selection Pressure ◽  
Susceptible Strain ◽  
Cross Resistance ◽  
Resistance Factors ◽  
Organophosphate Resistance ◽  
Tobacco Whitefly ◽  
General Esterase

AbstractEleven strains of Bemisia tabaci (Gennadius), including a laboratory susceptible strain, were bioassayed as adults with three organophosphorus (OP) insecticides, three pyrethroids and one OP/pyrethroid combination. The contemporary strains were from diverse geographical areas and hosts and included examples of the A-, B-, and non-B-biotypes. All recent collections were multi-resistant to these insecticides which have been used extensively for their control. The patterns of cross-resistance for the OPs were clear but less so for the pyrethroids. All populations that resisted profenofos and cypermethrin also resisted the combination of profenofos and cypermethrin. Although the importance of selection pressure on levels of resistance was not easily quantifiable the highly selected populations exhibited the highest levels of resistance. The significant within, as well as between, biotype variation in resistance factors clearly indicated that insecticide resistance and biotype were not directly related. The roles of acetylcholinesterase sensitivity and general esterase activity in resistance to OPs and pyrethroids are discussed.

Plant Resistance in Some Modern Soybean Varieties May Favor Population Growth and Modify the Stylet Penetration of Bemisia tabaci (Hemiptera: Aleyrodidae)

2021 ◽  
Author(s):  
Mauricélia F Almeida ◽  
Clébson S Tavares ◽  
Euires O Araújo ◽  
Marcelo C Picanço ◽  
Eugênio E Oliveira ◽  
...  
Keyword(s):  
Population Growth ◽  
Bemisia Tabaci ◽  
Intrinsic Rate ◽  
Reproductive Rate ◽  
Genetically Engineered ◽  
Population Increase ◽  
Net Reproductive Rate ◽  
Bt Toxin ◽  
Demographic Performance

Abstract Complaints of severe damage by whiteflies in soybean fields containing genetically engineered (GE) varieties led us to investigate the role of transgenic soybean varieties expressing resistance to some insects (Cry1Ac Bt toxin) and to herbicide (glyphosate) on the population growth and feeding behavior of Bemisia tabaci (Gennadius) MEAM1 (Hemiptera: Aleyrodidae). In the laboratory, the whiteflies reared on the GE Bt soybeans had a net reproductive rate (R0) 100% higher and intrinsic rate of population increase (rm) 15% higher than those reared on non-GE soybeans. The increased demographic performance was associated with a higher lifetime fecundity. In electrical penetration graphs, the whiteflies reared on the GE soybeans had fewer probes and spent 50% less time before reaching the phloem phase from the beginning of the first successful probe, indicating a higher risk of transmission of whitefly-borne viruses. Data from Neotropical fields showed a higher population density of B. tabaci on two soybean varieties expressing glyphosate resistance and Cry1Ac Bt toxin. These results indicate that some GE soybean varieties expressing insect and herbicide resistances can be more susceptible to whiteflies than non-GE ones or those only expressing herbicide resistance. Most likely, these differences are related to varietal features that increase host-plant susceptibility to whiteflies. Appropriate pest management may be needed to deal with whiteflies in soybean fields, especially in warm regions, and breeders may want to consider the issue when developing new soybean varieties.

scholarly journals Effects of piperonyl butoxide on the toxicity of the organophosphate temephos and the role of esterases in the insecticide resistance of Aedes aegypti

2014 ◽  
Vol 47 (5) ◽  
pp. 579-582 ◽  
Author(s):  
Boscolli Barbosa Pereira ◽  
Jean Ezequiel Limongi ◽  
Edimar Olegário de Campos Júnior ◽  
Denis Prudencio Luiz ◽  
Warwick Estevam Kerr
Keyword(s):  
Aedes Aegypti ◽  
Insecticide Resistance ◽  
Piperonyl Butoxide

scholarly journals Two Deoxythymidine Triphosphate Synthesis-Related Genes Regulate Obligate Symbiont Density and Reproduction in the Whitefly Bemisia tabaci MED

2021 ◽  
Vol 11 ◽  
Author(s):  
Zezhong Yang ◽  
Cheng Gong ◽  
Yuan Hu ◽  
Jie Zhong ◽  
Jixing Xia ◽  
...  
Keyword(s):  
Amino Acid ◽  
Rna Interference ◽  
Bemisia Tabaci ◽  
Essential Amino Acid ◽  
Cellular Growth ◽  
Capacity Analysis ◽  
Host Insect ◽  
Obligate Symbiont ◽  
Pyrimidine Pathway

Deoxythymidine triphosphate (dTTP) is essential for DNA synthesis and cellular growth in all organisms. Here, genetic capacity analysis of the pyrimidine pathway in insects and their symbionts revealed that dTTP is a kind of metabolic input in several host insect/obligate symbiont symbiosis systems, including Bemisia tabaci MED/Candidatus Portiera aleyrodidarum (hereafter Portiera). As such, the roles of dTTP on both sides of the symbiosis system were investigated in B. tabaci MED/Portiera. Dietary RNA interference (RNAi) showed that suppressing dTTP production significantly reduced the density of Portiera, significantly repressed the expression levels of horizontally transferred essential amino acid (EAA) synthesis-related genes, and significantly decreased the reproduction of B. tabaci MED adults as well as the hatchability of their offspring. Our results revealed the regulatory role of dTTP in B. tabaci MED/Portiera and showed that dTTP synthesis-related genes could be potential targets for controlling B. tabaci as well as other sucking pests.

The importance of pH in food selection by the tobacco whitefly,Bemisia tabaci

1983 ◽  
Vol 11 (3-4) ◽  
pp. 151-160 ◽  
Author(s):  
M. J. Berlinger ◽  
Z. Magal ◽  
Aliza Benzioni
Keyword(s):  
Bemisia Tabaci ◽  
Food Selection ◽  
Tobacco Whitefly

scholarly journals Host Preference Vegetables of Tobacco Whitefly Bemisia tabaci (Gennadius, 1889) in Nepal

2015 ◽  
Vol 20 (1) ◽  
pp. 133-137 ◽  
Author(s):  
Mohan Sharma ◽  
Prem Bahadur Budha
Keyword(s):  
Host Plant ◽  
Bemisia Tabaci ◽  
Free Choice ◽  
Host Preference ◽  
Science And Technology ◽  
Tobacco Whitefly

The host preference of whitefly Bemisia tabaci was experimented in four economically important vegetable plants viz. tomato, brinjal, capsicum and cucumber in 2012-2013. It was found that preference of whitefly for feeding under both conditions free-choice and no-choice was significantly different after 24 hours, 48 hours, 72 hours and 96 hours. Cucumber was the most preferred host plant for oviposition while capsicum was the least.Journal of Institute of Science and Technology, 2015, 20(1): 133-137

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