6 documents found, page 1 of 1
Effect of cover crops on the weed flora of processing tomatoes in a regenerativ...
Amaral, Artur; Calha, Isabel M.Cover crops (CC) are plants grown to provide regulating, supporting, and cultural ecosystem services in managed environments. Numerous studies have investigated the impact of cover crops on weeds. Winter cover crops suppressed both weed biomass and weed population density in spring crops, particularly early in the cash crop growing season. However, to effectively use weed suppression services from cover crops, ...
Mechanisms of resistance in populations of Echinochloa sp. from Portugal and Spain
Calha, Isabel M.; Osuna, Maria Dolores; Nunes, Clara; García-García, Blanco; Rodrigues, Mónica Isabel; Andrade, EugéniaWeed resistance to herbicides affects the main rice producing countries in the Iberian Peninsula. Over-reliance on acetolactate synthase (ALS) and acetyl-CoA carboxylase (ACCase) inhibitor herbicides, as well as low diversity of cultural practices have increased selection pressure towards resistant populations. Recently, the emergence of weeds with multiple resistance has also been observed. In the Iberian Peni...
Renaturalização da Agricultura - Nota de abertura do fascículo especial de comu...
Portugal, João; Calha, Isabel M.; Aguiar, FranciscaÉ responsabilidade das sociedades científicas, de que são exemplo a Sociedade Portuguesa de Ciências Agrárias (SCAP) e da Sociedad Española de Malherbologia (SEMh), organizar reuniões e encontros para promover a discussão sobre temáticas que se encontram no âmbito da sua Missão. Este fascículo especial da Revista de Ciências Agrárias é dedicado à publicação das comunicações apresentadas no IV Simpósio Nacional ...
Comparison between the mechanisms of Clearfield ® wheat and Lolium rigidum mult...
Torra, Joel; Montull, José M.; Calha, Isabel M.; Osuna, Maria D.; Prado, Rafael De; Fernandes, JoãoThe evolution of herbicide resistance in weeds has emerged as one of the most serious threats to sustainable food production systems, which necessitates the evaluation of herbicides to determine their efficacy. The first herbicide resistance case in the Iberian Peninsula was reported about 50 years ago, wherein Panicum dichotomiflorum was found to be resistant (R) to atrazine in Spanish maize fields. Since then...
Current status of herbicide resistance in the Iberian Peninsula: Future trends ...
Torra, Joel; Montull, José M.; Calha, Isabel M.; Osuna, Maria D.; De Prado, Rafael; Fernandes, JoãoThe evolution of herbicide resistance in weeds has emerged as one of the most serious threats to sustainable food production systems, which necessitates the evaluation of herbicides to determine their efficacy. The first herbicide resistance case in the Iberian Peninsula was reported about 50 years ago, wherein Panicum dichotomiflorum was found to be resistant (R) to atrazine in Spanish maize fields. Since then...
Resistências cruzadas em biótipos de Alisma Plantago-Aquatica resistentes ao be...
Calha, Isabel M.; Moreira, Ilídio; Rocha, FátimaA aplicação repetida de bensulfurão-metilo em arrozais dos vales dos rios Sorraia, Sado e Mondego seleccionaram populações resistentes (R) de Alisma plantago-aquatica (Mo260, Sa88, So306 e So307). Determinou-se o nível de resistência (NR= ED50 R/ ED50 S) ao bensulfurão-metilo em plantas com 26 dias (6 filódios lineares) e com 42 dias (6 filódios expandidos) e a resistência cruzada a 14 herbicidas. Confirmou-se ...