The infestantes had constituted, since the primrdios of agriculture tie to our days, concern of the seen Man to be responsible for the reduction of the productions of the cultures, today aggravated for impressive demographic increase world-wide e, therefore, for the constant food search. The infestantes provoke damages under diverse forms: in the cultivated fields it is necessary to invest - one high one I am numbered of hours in cultural operations for its containment or eradication. Only in the United States, the losses provoked for the infestantes had been esteem in 5 a thousand million dollar, value that is only surpassed by losses caused for the erosion of the ground in those Parents. On the other hand, it is calculated that 16% of the value of the harvests if must the cultural operations. The half of the necessary work must the infestantes gifts and, therefore, in each hectare of cultivated land they are lost, only in time, 8% of the value of the production (Young chicken, 2008). In our Parents, he has not been few the efforts in the direction of if placing Agriculture in a level where it can satisfy the necessities alimentary of the populations. In this context, study of the infestantes it appears as plus a necessary, imperious effort until, visa to be able to supply indispensable elements of base to the job multicriteria of cultural techniques that lead to the increase, for unit of surface, of the agricultural productions, particularly the pesticide use that if it justifies in the great extensions of cultivated lands had the scarcity of hand of resultant workmanship of the agricultural exodus and the morosidade of monda and/or sacha manual, more accented in great areas. The work of study of the main infestantes in the main cultures of Angola, constitutes a starting point for future works of gnero in other cultures.