Estabilidade da resistência de Brevipalpus phoenicis (Geijskes) (Acari: Tenuipalpidae) a hexythiazox em pomares de citros

Campos, Fábio Angioluci Diniz; Omoto, Celso

doi:10.1590/s1519-566x2006000600019

Cited by 14 publications

(5 citation statements)

References 17 publications

(21 reference statements)

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“…The instability of acaricide resistance was also reported by several authors (Inoue 1980;Sato et al 2004;Stumpf and Nauen 2002;Campos and Omoto 2006). The instability of resistance, as observed in this strain of spider mite, is considered favorable for the management of resistance (Dennehy et al 1990).…”

Section: Frequency Of Resistance (%)supporting

confidence: 52%

Milbemectin resistance in Tetranychus urticae (Acari: Tetranychidae): selection, stability and cross-resistance to abamectin

2009

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Studies on artificial laboratory selections with milbemectin, stability of milbemectin resistance and possible cross-resistance with abamectin were carried out with Tetranychus urticae Koch to provide basic information for a milbemectin resistance management program. Selections for resistance and susceptibility to milbemectin were performed in a population of T. urticae, collected from a commercial chrysanthemum field in the State of São Paulo, Brazil. After six selections for resistance and five selections for susceptibility, susceptible (S) and resistant (R) strains of T. urticae to milbemectin were obtained. The resistance ratio (R/S) at the LC(50) reached 409-fold value. The stability of milbemectin resistance was also studied under laboratory conditions, using a population with initial frequency of 75% of resistant mites. The frequencies of milbemectin resistance were evaluated monthly for a period of 7 months. In order to observe possible correlation between milbemectin and abamectin resistance, the frequencies of abamectin resistance were also evaluated for that population, during the same period. The frequency of milbemectin resistance decreased from 75 to 14.5%, while the percentage of abamectin resistant mites decreased from 57 to 9.1%, in 7 months. The frequencies of milbemectin and abamectin resistance were also evaluated in 25 field populations of T. urticae, collected from several crops in the State of São Paulo. The frequencies of milbemectin resistance varied from 4.1 to 89.5%, and of abamectin, from 7.0 to 90.5%. A positive and significant correlation was observed between the frequencies of milbemectin and abamectin resistance, indicating positive cross-resistance between these acaricides. The results indicate that abamectin should be avoided for managing milbemectin resistance in T. urticae. This is the first report on milbemectin resistance in T. urticae in Brazil.

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Section: Frequency Of Resistance (%)supporting

confidence: 52%

Milbemectin resistance in Tetranychus urticae (Acari: Tetranychidae): selection, stability and cross-resistance to abamectin

2009

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“…However, these results differ from those reported for resistant and susceptible populations of Brevipalpus phoenicis , which showed no significant differences in the fecundity and longevity of female adults. 6 , 9 …”

Section: Discussionmentioning

confidence: 99%

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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“…No entanto, em condições de campo, a resistência apresentou instabilidade em rotação de acaricidas (Campos & Omoto 2002, 2006. A presença de custo adaptativo em B. phoenicis é importante para o restabelecimento da suscetibilidade, uma vez que a imigração de ácaros suscetíveis provenientes de plantas hospedeiras para plantas cítricas foi considerada baixa (Alves et al 2005).…”

Section: Resultsunclassified

Resistência de Brevipalpus phoenicis (Geijskes) (Acari: Tenuipalpidae) a acaricidas inibidores da respiração celular em citros: resistência cruzada e custo adaptativo

Franco¹,

Casarin²,

Domingues³

et al. 2007

Neotrop. entomol.

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-Acaricides that inhibit cellular respiration play an important role in the control of Brevipalpus phoenicis (Geijskes) in citrus groves in Brazil. Studies were conducted to evaluate: (a) the variability in the susceptibility among B. phoenicis populations collected from citrus groves to cyhexatin, azocyclotin, propargite and sulphur; (b) cross-resistance relationships between propargite and azocyclotin, cyhexatin, dinocap, pyridaben and sulphur; and (c) the fitness cost associated with propargite resistance in B. phoenicis under laboratory conditions. A residual-type contact bioassay was used to characterize the susceptibility. The susceptibility was estimated with diagnostic concentrations based LC 95 of each acaricide. The cross-resistance was evaluated by characterizing the concentration-mortality responses of susceptible (S) and propargiteresistant (Propargite-R) strains. The fitness cost was evaluated by measuring the biological parameters of S and Propargite-R strains on citrus fruits at 25 ± 1 o C and fotophase of 14h. Significant differences in the susceptibility of B. phoenicis were detected at diagnostic concentration of cyhexatin (survivorship from 16.3% to 80.5%), azocyclotin (from 3.0% to 15.0%), propargite (from 1.0% a 71.6%) and sulphur (from 9.0% to 82.6%). A low intensity of cross-resistance was detected between propargite and the acaricides azocyclotin (1.8-fold), cyhexatin (4.6-fold), dinocap (3.5-fold) and pyridaben (3.5-fold). On the other hand, the intensity of cross-resistance to sulphur (> 111-fold) was very high. There was no fitness cost associated with B. phoenicis resistance to propargite, based on biological parameters evaluated. Therefore, the use of these acaricides should also be done very carefully in resistance management of B. phoenicis to acaricides. KEY WORDS: Flat mite, propargite, cyhexatin, resistance management RESUMO -Acaricidas inibidores da respiração celular são importantes para o controle de Brevipalpus phoenicis (Geijskes) na cultura dos citros no Brasil. Foram conduzidos estudos para avaliar: (a) a variabilidade na suscetibilidade de populações de B. phoenicis coletadas em pomares de citros para cihexatim, azociclotim, propargite e enxofre; (b) relações de resistência cruzada entre propargite e os acaricidas azociclotim, cihexatim, dinocape, piridabem e enxofre; e (c) o custo adaptativo associado à resistência de B. phoenicis a propargite em condições de laboratório. O método de bioensaio adotado foi o contato residual. A suscetibilidade foi estimada com concentrações diagnósticas baseadas na CL 95 de cada acaricida. A resistência cruzada foi avaliada pela caracterização da curva de concentração-mortalidade das linhagens suscetível (S) e resistente a propargite (Propargite-R). O custo adaptativo foi avaliado mediante comparação de parâmetros biológicos das linhagens S e Propargite-R em frutos de laranja a 25 ± 1 o C e fotofase de 14h. Diferenças significativas na sobrevivência de B. phoenicis foram verificadas aos acaricidas cihexatim (de 16,3% a 80,5%), ...

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Estabilidade da resistência de Brevipalpus phoenicis (Geijskes) (Acari: Tenuipalpidae) a hexythiazox em pomares de citros

Cited by 14 publications

References 17 publications

Milbemectin resistance in Tetranychus urticae (Acari: Tetranychidae): selection, stability and cross-resistance to abamectin

Milbemectin resistance in Tetranychus urticae (Acari: Tetranychidae): selection, stability and cross-resistance to abamectin

Resistance of Aedes aegypti to temephos and adaptive disadvantages

Resistência de Brevipalpus phoenicis (Geijskes) (Acari: Tenuipalpidae) a acaricidas inibidores da respiração celular em citros: resistência cruzada e custo adaptativo

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