scholarly journals Repellent activity of DEET against Amblyomma cajennense (Acari: Ixodidae) nymphs submitted to diferent laboratory bioassays

2010 ◽  
Vol 19 (01) ◽  
pp. 12-17 ◽  
Author(s):  
S. F. Soares ◽  
R. de S. Braga ◽  
L. L. Ferreira ◽  
C. C. B. Louly ◽  
L. A. D. de Sousa ◽  
...  
Keyword(s):  
Repellent Activity ◽  
Amblyomma Cajennense ◽  
Laboratory Bioassays

scholarly journals Repellent activity of DEET against Amblyomma cajennense (Acari: Ixodidae) nymphs submitted to different laboratory bioassays

2010 ◽  
Vol 19 (1) ◽  
pp. 12-16
Author(s):  
Sara Fernandes Soares ◽  
Raquel de Sousa Braga ◽  
Lorena Lopes Ferreira ◽  
Carla Cristina Braz Louly ◽  
Lorena Alessandra Dias de Sousa ◽  
...  
Keyword(s):  
Repellent Activity ◽  
Amblyomma Cajennense ◽  
Laboratory Bioassays

Repellent activity of plant-derived compounds against Amblyomma cajennense (Acari: Ixodidae) nymphs

2010 ◽  
Vol 167 (1) ◽  
pp. 67-73 ◽  
Author(s):  
Sara Fernandes Soares ◽  
Lígia Miranda Ferreira Borges ◽  
Raquel de Sousa Braga ◽  
Lorena Lopes Ferreira ◽  
Carla Cristina Braz Louly ◽  
...  
Keyword(s):  
Repellent Activity ◽  
Amblyomma Cajennense

A case of gynandromorphism in Amblyomma mixtum (Acari, Ixodidae)

2017 ◽  
Vol 43 (2) ◽  
pp. 268
Author(s):  
Fredy A. Rivera-Páez ◽  
Marcelo B. Labruna ◽  
Thiago F. Martins ◽  
Bruno Rodrigues-Sampieri ◽  
María I. Camargo-Mathias
Keyword(s):  
Tick Species ◽  
Morphological Characteristics ◽  
Amblyomma Cajennense ◽  
Literature Report ◽  
Male And Female ◽  
Natural Infestation

Gynandromorphism is a condition in which an organism simultaneously exhibits male and female morphological characteristics. In Colombia, the taxon Amblyomma cajennense is represented by the species Amblyomma patinoi and Amblyomma mixtum. In September of 2014, in the Colombian Orinoco region, adult ticks were collected and determined from natural infections in bovines and equines. A gynandromorph was described from a natural infestation on a bovine, and morphologically classified as A. mixtum. This is the first literature report of a gynandromorph of A. mixtum, and the first description of a gynandromorph for a tick species in Colombia.

In Vitro Screening of Azalea for Resistance to Azalea Lace Bug

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 506b-506
Author(s):  
Carol D. Robacker ◽  
S.K. Braman
Keyword(s):  
Leaf Damage ◽  
In Vitro Screening ◽  
Screening Assay ◽  
Delaware Valley ◽  
In Vitro Techniques ◽  
Culture Tube ◽  
Lace Bug ◽  
Lace Bugs ◽  
Laboratory Bioassays

Azalea lace bug (Stephanitis pyrioides) is the most serious pest on azalea. Results of laboratory bioassays and field evaluations of 17 deciduous azalea taxa have identified three resistant taxa: R. canescens, R. periclymenoides, and R. prunifolium. Highly susceptible taxa are `Buttercup', `My Mary', R. oblongifolium, and the evergreen cultivar `Delaware Valley White'. To determine whether in vitro techniques would have potential value in screening or selecting for resistance, or for the identification of morphological or chemical factors related to resistance, an in-vitro screening assay was developed. In-vitro shoot proliferation was obtained using the medium and procedures of Economou and Read (1984). Shoots used in the bioassays were grown in culture tubes. Two assays were developed: one for nymphs and one for adult lace bugs. To assay for resistance to nymphs, `Delaware Valley White' leaves containing lace bug eggs were disinfested with 70% alcohol and 20% commercial bleach, and incubated in sterile petri plates with moistened filter paper until the nymphs hatched. Five nymphs were placed in each culture tube, and cultures were incubated for about 2 weeks, or until adults were observed. To assay for resistance to adults, five female lace bugs were placed in each culture tube and allowed to feed for 5 days. Data collected on survival and leaf damage was generally supportive of laboratory bioassays and field results. Adult lace bugs had a low rate of survival on resistant taxa. Survival of nymphs was somewhat reduced on resistant taxa.

scholarly journals Antifeedant Effects and Repellent Activity of Loline Alkaloids from Endophyte-Infected Tall Fescue against Horn Flies, Haematobia irritans (Diptera: Muscidae)

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 817
Author(s):  
Javier Espinoza ◽  
Manuel Chacón-Fuentes ◽  
Andrés Quiroz ◽  
Leonardo Bardehle ◽  
Paul Escobar-Bahamondes ◽  
...  
Keyword(s):  
Tall Fescue ◽  
Preparative Thin Layer Chromatography ◽  
Repellent Activity ◽  
Choice Test ◽  
Haematobia Irritans ◽  
Major Pest ◽  
Horn Flies ◽  
Layer Chromatography ◽  
Hydrolysis Of ◽  
Spatial Repellency

Haematobia irritans is an obligate bloodsucking ectoparasite of cattle and is the global major pest of livestock production. Currently, H. irritans management is largely dependent upon broad-spectrum pesticides, which lately has led to the development of insecticide resistance. Thus, alternative control methods are necessary. Endophyte-infected grasses have been studied as an alternative due to their capability to biosynthesize alkaloids associated with anti-insect activities. Thus, the main aim of this study was to evaluate the antifeedant and repellent activity of lolines obtained from endophyte-infected tall fescue against H. irritans adults in laboratory conditions. The alkaloid extract (ALKE) was obtained by acid–base extraction. N-formyl loline (NFL) and N-acetyl loline (NAL) were isolated by preparative thin layer chromatography (pTLC) and column chromatography (CC), and the loline was prepared by acid hydrolysis of a NFL/NAL mixture. Loline identification was performed by gas chromatography coupled to mass spectrometry (GC/MS). Feeding behavior was evaluated by a non-choice test, and olfactory response was evaluated using a Y-tube olfactometer. Accordingly, all samples showed antifeedant activities. NFL was the most antifeedant compound at 0.5 µg/µL and 1.0 µg/µL, and it was statistically equal to NAL but different to loline; however, NAL was not statistically different to loline. NFL and NAL at 0.25 µg/µL were more active than loline. All samples except loline exhibited spatial repellency in the olfactometer. Thus, the little or non-adverse effects for cattle and beneficial activities of those lolines make them suitable candidates for horn fly management.

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