Dermanyssus gallinae are hematophagous mites that pose a serious sanitary problem in the Brazilian laying poultry industry. Its control is typically performed with acaricides, either in powder or liquid form.However, the intensive use of these products has led populations of this species to develop resistance. The aim of the present study is to evaluate the response of D. gallinae eggs and adults to products in aqueous suspension as per the commercial indication and registered at the Ministry of Agriculture, Livestock, and Supply. The study used four different acaricides (Product 1-Cypermethrin, Chlorpyrifos, and Piperonyl Butoxide; Product 2 -Alkyl-benzyl-dimethyl ammonium chloride, glutaraldehyde, deltamethrin; Product 3 -Dichlorvos; Product 4 -Fluralaner) tested in vitro using the contact method. Distilled water was used in the control group. There was difference between eggs and adults in each treatment (p < 0.05, except for control); products had higher efficacy against adult forms. This result might be directly related to frequent D. gallinae reinfestations in poultry houses.
Os museus de ciências são espaços não formais de ensino que possuem sua conexão com a sociedade estabelecida a partir de uma inquietação com a educação e com a disseminação científica. O presente trabalho tem por objetivo compreender as principais motivações e dificuldades apresentadas por professores da rede básica na utilização dos serviços prestados pelo Museu de Ciências Univates através de um questionário estruturado com perguntas específicas. Por meio das respostas apresentadas, verificou-se dificuldades de deslocamento, complexidade em conciliar as saídas da escola com o currículo escolar, além de motivações como o complemento educativo, a ampliação do conhecimento científico e a vivência prática com a teoria.
Dermanyssus gallinae are hematophagous mites that pose a serious sanitary problem in the Brazilian laying poultry industry. Its control is typically performed with acaricides, either in powder or liquid form. However, the intensive use of these products has led populations of this species to develop resistance. The aim of the present study is to evaluate the response of D. gallinae eggs and adults to products in aqueous suspension as per the commercial indication and registered at the Ministry of Agriculture, Livestock, and Supply. The study used four different acaricides (Product 1- Cypermethrin, Chlorpyrifos, and Piperonyl Butoxide; Product 2 - Alkyl-benzyl-dimethyl ammonium chloride, glutaraldehyde, deltamethrin; Product 3 – Dichlorvos; Product 4 – Fluralaner) tested in vitro using the contact method. Distilled water was used in the control group. There was difference between eggs and adults in each treatment (p < 0.05, except for control); products had higher efficacy against adult forms. This result might be directly related to frequent D. gallinae reinfestations in poultry houses.
The South of Brazil is the largest producer of grapes, however this production is affected by climate and herbivores such as phytophagous mites. The aim of this work was to associate the mite fauna with the grape cultivars Chardonnay, BRS Lorena and hybrid cultivars rootstock Paulsen 1103, in trellising and espalier systems, in the municipalities of Bento Gonçalves and Garibaldi, Rio Grande do Sul State, Brazil. The cultivars were: Chardonnay trellis (Cl) Chardonnay espalier (Ce), BRS Lorena trellis (Ll), BRS Lorena espalier (Le) and the hybrid cultivars Paulsen rootstock 1103 (Pa). Monthly samplings were carried out from November 2016 to April 2017. Twenty plants per area were randomly sampled, from each plant three apical leaves were collected, apical, median and basal branches (60 leaves / area). In total, 6,865 mites belonging to seven families, 13 genera and 22 species were collected. The most abundant phytophagous belong to Tarsonemidae and Tenuipalpidae, the predators to Phytoseiidae and the generalists to Tydeidae and Iolinidae. The cultivars Lorena Ll was the greatest similarity (82.39%) among species mites, followed by Paulsen Pa (72.54%), Lorena Le (70.67%), Chardonnay Cl (31.79%) and Chardonnay Ce (31.48%). The highest dissimilarity among the cultivars occurred between Chardonnay Ce and Lorena Le (66.49%), followed by Chardonnay Ce, Chardonnay Cl (66.44%), Chardonnay Ce and Lorena Ll (61.49 %). Thus, there is homogeneity between the sampled cultivars and the conduction systems and the apical third of the leaves and the sampling period are important in determining the composition of the species.
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