| Autor: |
Gobbi PC; Departamento de Fitossanidade, Faculdade de Agronomia Eliseu Maciel (FAEM), Universidade Federal de Pelotas, Pelotas, Rio Grande do Sul, 96001-970, Brazil. priscillagobbi@hotmail.com., Duarte JLP; Departamento de Fitossanidade, Faculdade de Agronomia Eliseu Maciel (FAEM), Universidade Federal de Pelotas, Pelotas, Rio Grande do Sul, 96001-970, Brazil., da Silva LR; Departamento de Fitossanidade, Faculdade de Agronomia Eliseu Maciel (FAEM), Universidade Federal de Pelotas, Pelotas, Rio Grande do Sul, 96001-970, Brazil., Nava DE; Laboratório de Entomologia da Empresa Brasileira de Pesquisa Agropecuária (Embrapa Clima Temperado), Pelotas, RS, Brazil., Fialho GS; Departamento de Matemática e Estatística, Matemática, Universidade Federal de Pelotas, Pelotas, Rio Grande do Sul, 96001-970, Brazil., da Cunha US; Departamento de Fitossanidade, Faculdade de Agronomia Eliseu Maciel (FAEM), Universidade Federal de Pelotas, Pelotas, Rio Grande do Sul, 96001-970, Brazil., da F Duarte A; Departamento de Fitossanidade, Faculdade de Agronomia Eliseu Maciel (FAEM), Universidade Federal de Pelotas, Pelotas, Rio Grande do Sul, 96001-970, Brazil. |
| Abstrakt: |
The responses of arthropods to thermal stress are vital in ecological studies in order to understand survival, development, and reproduction. However, this subject is poorly addressed. In the order Mesostigmata, an abundance of species lives in the soil. Among these species, Stratiolaelaps scimitus (Womersley) is a predator used in the control of pest organisms that live in the soil. Mites of this species are commercialized in several countries, including Brazil, presenting efficiency in pest control in several crops. The objective of this study was to evaluate the effect of thermal shock on S. scimitus females, as well as to monitor the temperature variation in the environment. For each temperature, 80 experimental units were assembled for different periods (0.5, 1, 2, and 4 h). Experimental units were maintained at 25 °C, after exposure of the mites. Mortality and oviposition were evaluated. The results showed a 40% reduction in the survival of mites exposed to 37 °C for 4 h, compared to the control treatment (25 °C). Oviposition was less affected at 1 h exposure to temperatures of 19 and 12 °C and thermic fluctuation was observed in the greenhouse, especially inside the slabs. Understanding temperature effects in mites and the thermic fluctuation in the environment is essential to achieve satisfactory results in biological control. It is important to observe the scenario in which predatory mites will be released as these aspects are decisive in predatory activity. |
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