نمو و انتاج الفريز تحت ظروف الزراعة المحمية و اثر الاكاروس العنكبوتي ذي البقعتين في ذلك بوجود المفترس الاكاروسي Phytoseiulus persimilis Athias-Henroit

This study was carried out in a green house in Lattakia center for rearing natural enemies during 2005-2006 and 2006-2007. The study included three treatments: 1. control (healthy plants); 2. plants infected with the prey Tetranychus urticae; 3. plants infected with the prey and the predatory mite Phytoseiulus persimilis. Results showed that there was a negative effect of T.urticae in the prey treatment, where the control and predator treatments were significantly better in the total number of leaves/plant, foliage area, leaf area index, photo synthetic capacity, and chlorophyll concentrate. The contents of nitrate and ascorbic acid were high in the prey treatment with high significant difference in comparison with other treatments. The production was low in the prey treatment, and fruits were deformed too.