Plant species with the capacity to tolerate heavy metals are potentially useful for phytoremediation since they have adapted to survive and reproduce under toxic conditions and to accumulate high metal concentrations. Gomphrena claussenii Moq., a South-American species belonging to the Amaranthaceae, is found at a zinc (Zn) mining area in the state of Minas Gerais, Brazil. Through soil and hydr...

during 2007-2008 growing season, a total of 520 sunflower leaf samples with symptoms like vein clearing, cholorotic and necrotic local lesion, deformation and stunting which were suspected of being infected with tobacco streak virus (tsv) were collected from sunflower fields of azarbayijan-gharbi, isfahan, qom, markazi, tehran and hamedan provinces. infection with tsv in collected samples were ...

zucchini yellow mosaic virus (zymv) is a potyvirus with a worldwide distribution. this virus causes serious economic losses in iran in many cucurbits. during 2002-2003, sam-ples were collected from squash fields in tehran province. five isolates (z1, z2, z3, z4 and z5) were inoculated on 27 species of cucurbitaceae, chenopodiaceae, amarantha-ceae,solanacae, leguminosae and ranunculaceae. chenop...

reducing nitrogen status of floriculture plants is an effective tactic in pest management by decreasing host plant quality. life table parameters and population growth rate of aphis craccivora(hemiptera: aphidiae), as well as cosmetic and qualitative parameters losses associated with aphid infestation were evaluated in relation to n fertilization levels on gomphrena globosa, under greenhouse co...