Repellency of tsetse-refractory waterbuck (Kobus defassa) body odour to Glossina pallidipes (Diptera: Glossinidae): Assessment of relative contribution of different classes and individual constituents

Bett, Mathew K.; Saini, R. K.; Hassanali, Ahmed

doi:10.1016/j.actatropica.2015.02.017

Cited by 24 publications

(48 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(2013) tested a collar prototype with repellents identified on the non-host Kobus defassa by Gikonyo et al (2003) in association with a synthetic repellent against Glossinamorsitans.A 90% reduction in the transmission of trypanosomiasis was observed after the use of this prototype.Refinement of the blend constituents showed the potential to deploy the repellent-based technology to protect cattle from tsetse and the risk of exposure toTrypanosomespp. (Bett et al, 2015). Pageat (2005)reported the presence of allomonesbis(2-ethylhexyll) adipate and 2,2,4-trimethyl-1,3-pentanediol diisobutyratefromthe secretion of uropygialgland of ducks that repel red poultry mites, Dermanyssusgallinae, and a product comprising these compounds is being manufactured and distributed in Francefor use in the control of D. gallinae onpoultry farms.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, individual signal components emitted by each host can act synergisticallyor can exert antagonism to other ectoparasites (Nielsen et al, 2015;Weldon, 2010).For example, ablend of volatiles produced by the non-host waterbuck, Kobus defassa, was identified as being repellent to tsetse flies, Glossinamorsitans, (Bett et al, 2015;Gikonyo et al, 2002;Gikonyo et al, 2003). However, little is known about host natural odors that are repellent for ticks.…”

Section: Introduction 3mentioning

confidence: 99%

See 1 more Smart Citation

Brown dog tick, Rhipicephalus sanguineus sensu lato, infestation of susceptible dog hosts is reduced by slow release of semiochemicals from a less susceptible host

Filho

Ferreira

Sarria

et al. 2017

Ticks and Tick-borne Diseases

View full text Add to dashboard Cite

Domestic dog breeds are hosts for the brown dog tick, Rhipicephalus sanguineus sensu lato, but infestation levels vary among breeds. Beagles are less susceptible to tick infestations than English cocker spaniels due to enhanced production of 2-hexanone and benzaldehyde that act as volatile tick repellents. We report the use of prototype slow-release formulations of these compounds to reduce the burden of R. sanguineus s. l. on English cocker spaniel dogs. Twelve dogs were randomly assigned to two groups with six dogs each. The treated group received collars with slow-release formulations of the compounds attached, while the control group received collars with clean formulations attached. Five environmental infestations were performed, with the number of ticks (at all stages) on the dogs being counted twice a day for 45days. The counts on the number of tick stages found per dog were individually fitted to linear mixed effects models with repeated measures and normal distribution for errors. The mean tick infestation in the treated group was significantly lower than in the control group. For larvae and nymphs, a decrease in tick infestation was observed at the fifth count, and for adults, lower average counts were observed in all counts. The compounds did not interfere with the distribution of the ticks on the body of the dogs, as a similar percentage of ticks was found on the anterior half of the dogs (54.5% for the control group and 56.2% for the treated group). The biological and reproductive parameters of the ticks were not affected by the repellents. This study highlights for the first time the potential use of a novel allomone (repellent)-based formulation for reduction of tick infestation on susceptible dogs.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introduction 3mentioning

confidence: 99%

Brown dog tick, Rhipicephalus sanguineus sensu lato, infestation of susceptible dog hosts is reduced by slow release of semiochemicals from a less susceptible host

Filho

Ferreira

Sarria

et al. 2017

Ticks and Tick-borne Diseases

View full text Add to dashboard Cite

show abstract

“…δ-Octalactone with a six-membered ring and a propyl (CH 3 CH 2 CH 2 ) side chain at δ position was previously shown to be an important repellent component of waterbuck, a tsetse-refractory member of the related wildlife (Bett et al, 2015). In the present study, the effects of two structural features of the compound, ring size and the length of the side chain, on the responses of G. pallidipes and G. m. morsitans were first studied in a 2-choice wind tunnel.…”

Section: 0 Discussionmentioning

confidence: 99%

“…The effects of δ-octalactone and δ-nonalactone with/without 4-methylguaiacol on G. pallidipes catches in NG2G traps baited with acetone (~500mg/h) and fermented cow urine (1000mg/h) (Brightwell et al, 1991) were evaluated in the field in randomized Latin squares design (5 targets × 5 sites × 5 days) arrangement (Mireji et al, 2003; Bett et al, 2015). The traps were deployed in clearings about 300m apart.…”

Section: 0 Materials and Methodsmentioning

confidence: 99%

“…In a recent study, the effects of different blends of these compounds on catches of Glossina pallidipes in attractant-baited NG2G traps were evaluated in the field (Bett et al, 2015). Each class of constituents (acids, ketones, phenols and δ-octalactone) was found to significantly reduce catches, indicating that each contributes incrementally to the repellency of the waterbuck odour.…”

Section: 0 Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Responses of Glossina pallidipes and Glossina morsitans morsitans tsetse flies to analogues of δ-octalactone and selected blends

et al. 2016

Self Cite

View full text Add to dashboard Cite

Previous studies have shown that δ-octalactone is an important component of the tsetse-refractory waterbuck (Kobus defassa) repellent odour blend. In the present study, structure-activity comparison was undertaken to determine the effects of the length of the side chain and ring size of the lactone on adult Glossina pallidipes and Glossina morsitans morsitans. The responses of the flies to each compound were studied in a two-choice wind tunnel. Increasing the chain length from C3 (δ-octalactone) to C4 (δ-nonalactone) enhanced repellency to both species (G. pallidipes from 60.0 to 72.0 %, and G. m. morsitans from 61.3 to 72.6 %), while increasing the ring size from six (δ-octalactone) to seven members (ε-nonalactone) changed the activity from repellency to attraction that was comparable to that of the phenolic blend associated with fermented cow urine (p > 0.05). Blending δ-nonalactone with 4-methylguaiacol (known tsetse repellent) significantly (p < 0.05) raised repellency to 86.7 and 91.7 % against G. pallidipes and G. m. morsitans respectively. Follow-up Latin Square Designed field studies (Shimba hills in coastal areas in Kenya) with G. pallidipes populations confirmed the higher repellence of δ-nonalactone (with/without 4-methylguaiacol) compared to δ-octalactone (also, with/without 4-methylguaiacol). The results show that subtle structural changes of olfactory signals can significantly change their interactions with olfactory receptor neurons, and either shift their potency, or change their activity from repellence to attraction. Our results also lay down useful groundwork in the development of more effective control of tsetse by ‘push’, ‘pull’ and ‘push-pull’ tsetse control tactics.

show abstract

Characterisation of cattle anal odour constituents associated with the repellency of Rhipicephalus appendiculatus

2018

View full text Add to dashboard Cite

Repellency of tsetse-refractory waterbuck (Kobus defassa) body odour to Glossina pallidipes (Diptera: Glossinidae): Assessment of relative contribution of different classes and individual constituents

Cited by 24 publications

References 22 publications

Brown dog tick, Rhipicephalus sanguineus sensu lato, infestation of susceptible dog hosts is reduced by slow release of semiochemicals from a less susceptible host

Brown dog tick, Rhipicephalus sanguineus sensu lato, infestation of susceptible dog hosts is reduced by slow release of semiochemicals from a less susceptible host

Responses of Glossina pallidipes and Glossina morsitans morsitans tsetse flies to analogues of δ-octalactone and selected blends

Characterisation of cattle anal odour constituents associated with the repellency of Rhipicephalus appendiculatus

Contact Info

Product

Resources

About