As plantas alimentícias não convencionais (PANCs) são hortaliças nativas, normalmente encontradas em calçadas ou terrenos abandonados, sempre fizeram parte do cardápio dos antepassados. No entanto, com a modernização da agricultura e êxodo rural, seu consumo foi esquecido de ser repassado para as gerações futuras. O objetivo deste estudo consistiu realizar um levantamento bibliográfico sobre (P...

Band steaming is a non-chemical weed control method of increasing interest for highly remunerative, low competitive crops. This study aimed to test the field application new prototype band-steaming machine in three organic fields under contrasting Mediterranean environmental conditions. Trials were conducted carrot real-field conditions investigate effects doses and one (no steaming) on vegetat...

Weed behaviour in crop fields has been extensively studied; nevertheless, limited knowledge is available for particular cropping systems, such as no-till systems. Improving weed management under conditions requires an understanding of the interaction between residues and seedling emergence process. This study aimed to evaluate influence maize wheat residues, applied three different quantities (...

Experiments were conducted to test several methods for estimating low temperature thresholds for seed germination. Temperature responses of nine weeds common in annual agroecosystems were assessed in temperature gradient experiments. Species included summer annuals (Amaranthus albus, A. palmeri, Digitaria sanguinalis, Echinochloa crus-galli, Portulaca oleracea, and Setaria glauca), winter annua...

As part of an investigation of a plant virus which multiplies within the cells of its aphid vector (O'Loughlin and Chambers, 1967), the fine structure of the aphid gut was studied. The alimentary canal of aphids commences with the food canal which is formed by the apposition of grooves in the two interlocking feeding stylets . The stylet food canal leads to the sucking or pharyngeal pump within...

Following preliminary screening of 13 ethanolic plant extracts, belonging to 10 different families, a total of 11 extracts were subjected to detailed toxicity evaluation against the larval stage of the housefly, Musca domestica L. The larvicidal LC50 values were < 100 ppm for Piper nigrum (50.1 ppm), Azadirachta indica (76.9 ppm), Conyza aegyptiaca (77.0 ppm) and Cichorium intybus (96.8 ppm); r...