Özet:

This study was first conducted in 2013 with the aim of determining the changes in the frequency (%) and intensity (ad/m2) of foreign herbs that have problems in the production areas of Manisa and the Sea Islands (Origanum onites L.) located in the Egean region during the vegetation period. In the province of Manisa, in 21 fields 205 hectares and in four different dates, in the province of Denizli, in 129 fields 793 hectares and in five different dates, foreign grass species have been identified by counting. The calculations of foreign grass species, according to the size of the field, were made using a frame of 1/4 m2. According to the survey, 46 different species of foreign herbs belonging to 25 families in Manisa and 127 different species of foreign herbs belonging to 31 families in Denizli were identified. In the first number in Denizli, Senecio vernalis L. While the species (5.46 units/m2) are the most intense, the second number is Poa trivalis L. (1,36 units/m2) and the other two numbers are Cynodon dactylon L. (1,02 units/m2) and Digitaria sanguinalis L. (0,83 units/m2) respectively. In Manisa, in the first number, the Lactuca serriola L. (0,53 pcs/m2) is the most intense; in the second number, the Convolvulus arvensis L. (0,93 pcs/m2) is the most intense; in the other three numbers, the Cyperus rotundus L. (6,85-2,03-0,86 pcs/m2) is the most intense.

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