The density of eggs and nymphs of Bemisia tabaci (Gennadius) biotype B and the percent parasitism of the nymphs were measured from specimens collected on nine species of weeds, commonly found in west central Florida during the spring and summer of 2012 and 2013. The weeds were direct seeded in 2012 and grown as transplants in 2013 for Randomized Complete Block design experiments. The leaf area ...

during autumn and summer 2010 observed species from amaranthus genus were studied in segetal and ruderal environments of hamedan city. in this research, 100 plats randomly were selected and totally 6 species from amaranthus were identified as neophyte wild elements: a. retroflexus l. a. lividus l., a. chlorostachys willd, a. albus l., a. viridus l. and a. blitoides s. watson. dispersal of menti...

carbon dioxide is the most important resource for crop growth. in order to investigate the effect of elevated co2 concentration on morphological and physiological characteristics of sesame (sesamum indicum l.) and amaranthus (amaranthus retroflexus l.) an experiment was conducted in greenhouse conditions. the experiment was factorial based on randomized complete block design with six treatments...

Allelopathy can be regarded as a component of biological control in which plants are used to reduce the vigour and development of other plants. Allelopathy refers to the direct or indirect chemical effects of one plant on the germination, growth, or development of neighbouring plants. The allelopathic effects of leaf extracts of Thymus vulgaris, Lavadula sp, Rosmarinus officinalis and Eucalyptu...

in order to evaluate the effects of xanthium strumarium or amaranthus retroflexus competition under unsprayed and sprayed (half the recommended rate of imazethapyr) on canopy architecture of weed and soybean, field experiment was conducted at the research farm of university of tehran, during the growing season of 2007 and 2008. the experimental design was factorial based on randomized complete ...

Experiments were conducted in the greenhouse to assess root galling and egg production of three root-knot nematode species, Meloidogyne arenaria, M. incognita, and M. javanica, on several weeds common to Florida agricultural land. Weeds evaluated were Amaranthus retroflexus (redroot pigweed), Cyperus esculentus (yellow nutsedge), Eleusine indica (goosegrass), Portulaca oleracea (common purslane...

Pokus s različitim varijantama suzbijanja korova u usjevu kukuruza proveden je 2021. godini na lokaciji pored naselja Markovo Polje praškasto ilovastom tlu. Primijenjene su tri varijante korova: 1. mehaničko suzbijanje između redova motokultivatorom, a unutar ručno okopavanje motikom, 2. samo motokultivatorom bez redova, 3. ikakvog korova. Na pokusnom polju pronađeno 14 različitih vrsta od koji...