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In Romania, wheat is the main crop, occupying the largest area of arable land. Convolvulus arvensis is a competitive and invasive weed, produces direct and indirect damages to which is added production of allopathic substances. Allelopathy is a natural phenomenon which refers to any direct or indirect effect, positive or negative of a plant (including microorganisms) on the other by the release of chemical compounds in the environment [13]. In most cases, influence is inhibitory, which may explain why some plants ...

One of the species with the negative impact for corn crops in Europe is the coleopteran insect of Diabrotica virgifera virgifera (LeConte). The invasiveness but also the damage caused by adults can reduce the production of corn grain visible. By monitoring activities organized at local or national level (in Romania) often made confusion because coloristic variety intraspecific observed in insect populations. To identify the causes of color variability morphological studies were done on several samples present in d...