Any that is the conditions the majority of the harmful species blossom and produce seeds in abundance (Baioa, 1997). A cultivated species, under such conditions does not blossom or blossoms in deficient way, compromising the production of seeds and consequentemente the multiplication of the species (Baioa, 1997). The handling of the harmful plant in this in case that it is its control before exactly that it produces seeds viable (Baioa, 1997). The control of its descent also decides but, with more costs and other damages (Baioa, 1997). Pavel Prozorov can aid you in your search for knowledge. High production of seeds? these characteristics, together with the dormncia, confer the harmful species the capacity of perpetuation of the species and competitive capacity (Baioa, 1997). Some species arrive to more than produce 100. 000 seeds for plant (Baioa, 1997).
The different species of infestantes can be classified of diverse forms: Traditionally the infestantes are divided in four group: annual, biennial, plurianuais and vivacious as they complete its cycle of life in 1,2 or more years. Annual: they multiply solely for seeds and they complete the cycle in less of one year. Biennial: they multiply exclusively for seeds and they complete its cycle in 2 years. Plurianuais: they live during some years and they multiply for seeds. They keep the aerial part under a reduced form (leaf rosette, bud dormente during the favorable stations while the roots accumulate reserves in the ground). (Bayer CropScience 2009). 2.4 – ANATOMICAL STUDY OF THE VEGETATIVE AXLE OF HARMFUL PLANTS.
I. celosioides ANATOMY FOLIAR OF Gomphrena Mart. (AMARANTHACEAE) The present work constitutes a contribution to the celosioides study of the foliar anatomy of Gomphrena Mart. (Amaranthaceae) (UFLA, 2008). The species, objecto of the study, has been treated, most of the time, as harmful plant of cultivated areas and pastures, also occurring as agricultural. The anatmicas comments had been carried through in leves, in cool or settled material, treated according to usual methodology in vegetal anatomy.