introduction: weed competition is one of the major factors which limit sugar beet production in the world. weed – crop interactions are based on competition for water, nutrients and light and allelopathic effects may also play a small role. in sugar beet weed interference, all these factors are important too, but the light is of prime importance. due to the fact that a lot of weeds can grow abo...

Rice-duck farming system is one of the means of organic rice farming, in which the weeds, diseases and insects could be effectively controlled with minimal or no pesticide and herbicide application. Whereas in conventional rice-duck farming system the controlling effect on diseases, insect pests and weeds was slowly disappeared after the rice heading stage at which ducks were driven out of the ...

Three exotic Solanum weeds, Solanum elaeagnifolium Cav., Solanum mauritianum Scop. and Solanum sisymbriifolium Lam. (Solanaceae), are targets for biological control in South Africa. Preintroduction surveys of the insect herbivores attacking these, as well as native and cultivated species of Solanum, have proved useful in several ways. Although there is a diverse, mainly oligophagous, herbivore ...

Climate change may exacerbate the impacts of plant invasions by providing opportunities for new naturalisations and for alien species to expand into regions where previously they could not survive and reproduce. Although climate change is not expected to favour invasive plants in every case, in Aotearoa-New Zealand a large pool of potential new weeds already exists and this country is predicted...

Considering the increasing rice consumption in the world and also the excessive application of pesticides to increase production, an experiment was conducted to determine the pesticide residues and their effects on nitrogen, potassium and phosphorus content of Hashemi, Khazar and Gohar (SA13) rice cultivars, in a factorial design at randomized complete block design with three replications. In t...

in order to investigate the effect of chemical herbicides on control of broad leaf weeds of common bean, an experiment was conducted in 2007 at yasouj with 12 treatments in a randomized complete block design with 3 replications. treatments consisted of preplant application of trifluralin herbicide at 960 g ai ha-1; postemergence application of bentazon at 1200 g ai ha-1; imaztapir at 50, 75 and...

Systemic pesticides, including the widely used neonicotinoids, have been linked to colony losses in honeybees and declines in other pollinator species. More recently, evidence has accumulated suggesting that their widespread, often prophylactic use is harming important parts of soil and water ecosystems, putting biodiversity and ecosystem services at risk. Michael Gross reports. Systemic pestic...

Summary Over the past few years, both producers and consumers have become increasingly interested in organic farming because conventional agriculture relies so heavily on use of synthetic pesticides, thus causing environmental pollution. Weeds, as inevitable "companions" cultivated plants, represent a major, everlasting issue plant production. As production is legally regulated, control undesir...