Custo adaptativo associado à resistência de Aphis gossypii Glover (Hemiptera: Aphididae) ao inseticida carbosulfam

Konno, Roberto Hiroyuki; Omoto, Celso

doi:10.1590/s1519-566x2006000200014

Cited by 6 publications

(9 citation statements)

References 14 publications

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“…These results differ from those observed in populations of Chrysoperla externa resistant to Karate 15 and Aph is gossypii resistant to carbosulfan, 11 in which the survival rate significantly decreased in the absence of selection pressure, 11 indicating the tendency for resistance to those insecticides to reverse.…”

Section: Discussioncontrasting

confidence: 92%

“…Despite the disadvantage in the development parameters of the population from Estação Velha compared with the susceptible strain, these variables were not significantly different in the other resistant populations, corroborating the results of previous studies involving carbosulfam-resistant populations of Aphis gossypii . 11 The duration of nymph development and nymph viability did not significantly differ from those of the susceptible strain. 11 Similarly, no significant differences were observed in the duration of developmental stages in resistant and susceptible populations of Brev ipalpus phoenicis .…”

Section: Discussionmentioning

confidence: 85%

“…In general, the decreased survival rate among populations with different resistance ratios indicates that insecticide resistance is unstable in the absence of selection pressure. 11 However, although a high mortality rate (91.0%) was observed in the population with 20.0% resistant individuals, this rate tended to decrease in the subsequent month, and this was also observed in populations with 40.0%, 60.0%, and 80.0% resistant individuals. Therefore, it can be inferred that, for the Ae.…”

Section: Discussionmentioning

confidence: 88%

“…The detection of resistance and knowledge of the underlying resistance mechanisms can help to elucidate basic aspects of insecticide resistance and allow resistance management. 4 , 19 In populations with a fitness cost resulting from insecticide resistance, instability can be exploited in resistance-management programs (Konno & Omoto, 11 2006) because some of their main characteristics include adaptive disadvantage and loss of the biotic potential of resistant strains. Resistant populations are less fit than susceptible ones in the absence of selection pressure.…”

Section: Introductionmentioning

confidence: 99%

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Resistance of Aedes aegypti to temephos and adaptive disadvantages

et al. 2014

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OBJECTIVE To evaluate the resistance of Aedes aegypti to temephos Fersol 1G (temephos 1% w/w) associated with the adaptive disadvantage of insect populations in the absence of selection pressure.METHODS A diagnostic dose of 0.28 mg a.i./L and doses between 0.28 mg a.i./L and 1.40 mg a.i./L were used. Vector populations collected between 2007 and 2008 in the city of Campina Grande, state of Paraíba, were evaluated. To evaluate competition in the absence of selection pressure, insect populations with initial frequencies of 20.0%, 40.0%, 60.0%, and 80.0% resistant individuals were produced and subjected to the diagnostic dose for two months. Evaluation of the development of aquatic and adult stages allowed comparison of the life cycles in susceptible and resistant populations and construction of fertility life tables.RESULTS No mortality was observed in Ae. aegypti populations subjected to the diagnostic dose of 0.28 mg a.i./L. The decreased mortality observed in populations containing 20.0%, 40.0%, 60.0%, and 80.0% resistant insects indicates that temephos resistance is unstable in the absence of selection pressure. A comparison of the life cycles indicated differences in the duration and viability of the larval phase, but no differences were observed in embryo development, sex ratio, adult longevity, and number of eggs per female.CONCLUSIONS The fertility life table results indicated that some populations had reproductive disadvantages compared with the susceptible population in the absence of selection pressure, indicating the presence of a fitness cost in populations resistant to temephos.

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Section: Discussioncontrasting

confidence: 92%

Section: Discussionmentioning

confidence: 85%

Section: Discussionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

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Resistance of Aedes aegypti to temephos and adaptive disadvantages

et al. 2014

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“…This term was first coined by Crow (1957), who noted that resistant individuals would be at a disadvantage compared with susceptible individuals in the absence of selection pressure. Insect pests that are resistant to insecticides are commonly found to have a lower performance (Konno & Omoto, 2006;Biantao et al, 2009;Feng et al, 2009;Castañeda et al, 2011). Because the phenomenon is often driven by a physiological trait, we expect to find similar costs in ladybird beetle populations that are resistant to insecticides, although this pattern is not always found.…”

Section: Introductionmentioning

confidence: 87%

Life‐history costs associated with resistance to lambda‐cyhalothrin in the predatory ladybird beetle Eriopis connexa

Ferreira

Rodrigues

Silva-Torres

et al. 2012

Agri and Forest Entomology

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1 The present study assessed the fitness of a lambda-cyhalothrin-resistant population of Eriopis connexa (Germar) with respect to development, reproduction, survival under prey scarcity and prey consumption. 2 Nontreated resistant females (R0) and females recovered after the topical application of 0.05, 0.10 and 0.25 mg active ingredient/mL of lambda-cyhalothrin (R0.05, R0.10 and R0.25) produced, on average, 50% less eggs than susceptible females (S0), irrespective of the applied dose. All of the other traits evaluated remained similar. With respect to developmental characteristics, the larval viability and weight of adult male R0.25 progeny were statistically lower compared with the R0 and S0 progenies. Prey scarcity between days 3 and 13 of adulthood did not affect R0 and R0.25 survival, although egg production was significantly lower for R0 females, followed by R0.25 females, compared with S0 females. 3 The mean consumption of cotton aphids Aphis gossypii Glover over 5 consecutive days was significantly higher for S0, followed by R0 and R0.25, up to day 3 of observation. However, after day 4, prey consumption was similar among the three populations. 4 The results obtained in the present study show that resistant females have a lower reproductive output than susceptible females and that this is not related to the knockdown effect; however, the costs of recovering from knockdown interfere with the survival of offspring and also slightly with prey consumption. Thus, we conclude that the lambda-cyhalothrin-resistant E. connexa population exhibits an egg production disadvantage relative to the susceptible population and that this is increased when the population is subjected to prey scarcity.

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Increased production of mitochondrial reactive oxygen species and reduced adult life span in an insecticide-resistant strain ofAnopheles gambiae

Otali

Novak

Wan

et al. 2014

Bull. Entomol. Res.

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Control of the malaria vector An. gambiae is still largely obtained through chemical intervention using pyrethroids, such as permethrin. However, strains of An. gambiae that are resistant to the toxic effects of pyrethroids have become widespread in several endemic areas over the last decade. The objective of this study was to assess differences in five life-history traits (larval developmental time and the body weight, fecundity, hatch rate, and longevity of adult females) and energy metabolism between a strain of An. gambiae that is resistant to permethrin (RSP), due to knockdown resistance and enhanced metabolic detoxification, and a permethrin susceptible strain reared under laboratory conditions. We also quantified the expression levels of five antioxidant enzyme genes: GSTe3, CAT, GPXH1, SOD1, and SOD2. We found that the RSP strain had a longer developmental time than the susceptible strain. Additionally, RSP adult females had higher wet body weight and increased water and glycogen levels. Compared to permethrin susceptible females, RSP females displayed reduced metabolic rate and mitochondrial coupling efficiency and higher mitochondrial ROS production. Furthermore, despite higher levels of GSTe3 and CAT transcripts, RSP females had a shorter adult life span than susceptible females. Collectively, these results suggest that permethrin resistance alleles might affect energy metabolism, oxidative stress, and adult survival of An. gambiae. However, because the strains used in this study differ in their genetic backgrounds, the results need to be interpreted with caution and replicated in other strains in order to have significant implications for malaria transmission and vector control.

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Custo adaptativo associado à resistência de Aphis gossypii Glover (Hemiptera: Aphididae) ao inseticida carbosulfam

Cited by 6 publications

References 14 publications

Resistance of Aedes aegypti to temephos and adaptive disadvantages

Resistance of Aedes aegypti to temephos and adaptive disadvantages

Life‐history costs associated with resistance to lambda‐cyhalothrin in the predatory ladybird beetle Eriopis connexa

Increased production of mitochondrial reactive oxygen species and reduced adult life span in an insecticide-resistant strain ofAnopheles gambiae

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