Baseline susceptibility of persea mite (Acari: Tetranychidae) to abamectin and milbemectin in avocado groves in Southern California

Humeres, Eduardo C.; Morse, J. G.

doi:10.1007/s10493-005-1545-7

Cited by 18 publications

(14 citation statements)

References 7 publications

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“…The spray method of drug administration used in the present study is characterized by lesser timeconsuming, simple application where there is no need for extra training and the equipment are easily portable. Spraying method of abamectin was widely applied against mites (Humeres and Morse 2005;Venzon et al 2008;Koh et al 2009;Lin et al 2009). …”

Section: Discussionmentioning

confidence: 99%

Efficacy of abamectin against the fowl tick, Argas (Persicargas) persicus (Oken, 1818) (Ixodoidea: Argasidae)

et al. 2011

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Abamectin, in aqueous solutions of dose rates 0.0625, 0.125, 0.25, 0.5, and 1 mL/L, was sprayed on different feeding stages of the tick Argas (P.) persicus. The results revealed a marked increase of immobile and dead male or female ticks following a single treatment with the above doses, particularly the higher ones, and during the 5 weeks after treatment. Abamectin seriously decreased the percentage of fed ticks as well as that of oviposition and hatching. A decrease in the amount of emitted coxal fluid was observed also following treatment. Although the amount of ingested blood increased following abamectin treatment, digestion remained similar. The study also revealed that spraying a dose of 0.5 mL/L of abamectin in fowl shelters, i.e., floor, walls, ceiling, etc., is sufficient to eradicate A. persicus population.

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Section: Discussionmentioning

confidence: 99%

Efficacy of abamectin against the fowl tick, Argas (Persicargas) persicus (Oken, 1818) (Ixodoidea: Argasidae)

et al. 2011

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“…The study suggested that metabolic resistance through elevated levels of cytochrome P450 dependent monooxygenase-activity was involved in the resistance to these compounds (Van Pottelberge et al 2009b). A possible cross-resistance between abamectin and milbemectin in Oligonychus perseae Tuttle (Acari: Tetranychidae) was suggested by Humeres and Morse (2005), based on tests carried out in populations of this pest mite collected from avocado trees in California. Sato et al (2005) evaluated the stability of abamectin resistance in three populations of T. urticae with different (75, 50 and 25%) initial frequencies of resistant mites, and observed that the percentage of resistant mites decreased to levels equal or lower than 15% in 6 months, in all populations, in the absence of selection pressure.…”

Section: Frequency Of Resistance (%)mentioning

confidence: 99%

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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“…In some species of nematodes parasitic in small ruminants, IVM resistance has developed quite rapidly (Coles, Rhodes and Wolstenholme, 2005 ;Shoop, 1993). Resistance to avermectins has been reported in some ectoparasites and arthropod pests of crops (Clark et al 1995 ;Humeres and Morse, 2005) and recently IVM resistance in human Sarcoptes scabiei has been reported (Currie et al 2004). There is accumulating evidence that IVM resistance is developing in O. volvulus, for which annual or semi-annual IVM treatment has been the main control measure for up to 19 years.…”

Section: Introductionmentioning

confidence: 99%

ABC transporters and β-tubulin in macrocyclic lactone resistance: prospects for marker development

2007

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Macrocyclic lactones (MLs) are highly lipophilic anthelmintics which are known to bind to and open ligand-gated ion channels. However, these anthelmintics, and particularly the avermectin members of the ML class of endectocides, are potent substrates for ABC transporters and these transporters may regulate drug concentration in both the host and the parasite. There is accumulating evidence that ivermectin (IVM), and to a lesser extent moxidectin (MOX), selects for certain alleles of P-glycoprotein and other ABC transporter genes, selects for constitutive overexpression of some of these gene products, and induces overexpression of some P-glycoproteins in nematodes. However, such mechanisms of ML resistance do not easily lend themselves to the identification of SNP markers for resistance because of the diversity of ABC transporters in nematodes, the apparent diversity of effects of different MLs, and because regulatory elements for ABC transporter gene expression are not well understood in nematodes. Another non ligand-gated ion channel gene which appears to be under IVM selection, at least in Onchocerca volvulus and Haemonchus contortus, is beta-tubulin, and a simple genetic test for this selection has been described in O. volvulus. However, further work is required to elucidate a reliable marker associated with this gene in H. contortus or other parasitic nematodes of livestock. The possible involvement of ABC transporter genes and beta-tubulin in ML resistance provides a start in developing our understanding of this phenotype and markers for its detection in field populations of parasitic nematodes. However, more work is required before these leads can provide practical SNP markers for ML resistance.

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Baseline susceptibility of persea mite (Acari: Tetranychidae) to abamectin and milbemectin in avocado groves in Southern California

Cited by 18 publications

References 7 publications

Efficacy of abamectin against the fowl tick, Argas (Persicargas) persicus (Oken, 1818) (Ixodoidea: Argasidae)

Efficacy of abamectin against the fowl tick, Argas (Persicargas) persicus (Oken, 1818) (Ixodoidea: Argasidae)

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

ABC transporters and β-tubulin in macrocyclic lactone resistance: prospects for marker development

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