zea mays, bothriochloa ischaemum, anthemis arvensis, cirsium arvense, convolvulus arvensis, euphorbia exigua, helminthotheca echioides, lolium temulentum, lysimachia foemina, mercurialis annua, papaver dubium, polygonum bellardii, rumex acetosa, solanum nigrum, sonchus oleraceus, stachys annua