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Exposition of Pecan Black Aphid(Melanocallis caryaefoliae)to Creseote Bush(Larrea tridentata)Extracts

Agricultural Sciences 2014年第14期5卷 1369-1375页

作者： Monica Marin-Dominguez Ramona Perez-Leal Abelardo Nunez-Barrios moises basurto-sotelo Juan Manuel Soto-Parra Sciences Fruit Product Facultad de Ciencias AgrotecnológicasUniversidad Autónoma de ChihuahuaChihuahuaMéxico Plant Physiology Department Facultad de Ciencias AgrotecnologicasUniversidad Autonoma de ChihuahuaChihuahuaMéxico

Creseote bush-based (Larrea tridentata Cov.) botanical insecticides have not been evaluated on pecan black aphid (Melanocallis caryaefoliae D.), the purpose of this research was to test the insecticide and/or repellent effect of the creseote-bush raw extracts on this insect. Ethyl acetate, methanol and water as solvents, the stem and leaf organs were tested at concentrations of 0.5%, 1%, and 2%, as well as their witnesses and the interactions of each. Extract application was made by immersion during 10 s and the incubation was made in a wet chamber, making observations at 24, 48 and 72 hours after the treatment was applied. Mortality was evaluated by touching the aphid and seeing it did not move, while for repellence the insects found outside of the leaf were taken into account. A higher mortality effect was observed at a 1% concentration for the three solvents on the leaf extracts, being the methanol one the most efficient, on the other hand the stem extracts had the same behavior, presenting the higher mortality in the ethyl acetate extracts at 0.5% and 2% both at 72 hours. On the other hand the higher repellent effect presented at 24 hours in stem extracts, with a variation in the leaf extracts.

关键词： Botanical Insecticides Repellent Effect

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Different Approaches on the Investigation of Ground Water

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Journal of Earth Science and Engineering 2018年第1期8卷 39-49页

作者： Cassio Stein Moura Roberto Heemann moises Razeira Daniela Govoni sotelo Gabriela Borges Soares Giovanna Ramos Garcez Jfilio Cesar Gall Pires Vanessa da Conceicao Osorio Heldiane Souza dos Santos Institute of Petroleum and Natural Resources Pontifical University of Rio Grande do Sul Porto Alegre 90619-900 Brazil Federal University of the Pampa Cacapava do Sul 96570-000 Av. lpiranga 6681 Predio 96 J Porto Alegre RS Brazil

In this paper we discuss ways to obtain information about the quality of ground water and their availability. We classify the different approaches in two categories： geophysical methods, e.g., electroresistivity sounding, seismic survey, gravimetry, MT （magnetotelluric） method, and geochemical methods. The former ones are able to provide information on the geological structure,meaning depth, range, amount of water and possible connections among different exploration areas or regions at risk due to contamination. On the other hand, the last ones provide information about the quality of water and the possible of use for agriculture, industry or human consumption. As a case study we aim at the Guarani Aquifer, more specifically at its recharge zone on the southern rim.

关键词： Drought ground water geophysics geochemistry.

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