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    Influence of Potassium and Calcium Levels on Severity of Tomato Pith Necrosis and Yield of Greenhouse Tomatoes
    (Int Soc Horticultural Science, 2009) Ustun, N.; Altunlu, H.; Yokas, I.; Saygili, H.; Saygili, H; Sahin, F; Aysan, Y
    Two greenhouse experiments were carried out between the years of 2004-2006 in Aegean Region of Turkey to determine the influence of different potassium and calcium levels on severity of tomato pith necrosis caused by several pathogens belonging to genus Pseudomonas and Erwinia. The influence of three potassium (100 ppm, 200 ppm and 400 ppm) and two calcium (60 ppm and 120 ppm) levels on pith necrosis caused by four different bacteria (P. corrugata, P. cichorii, P. viridiflava and E. carotovora subsp. carotovora) were determined. The experiments were arranged on a greenhouse bench using a factorial randomized plot design with 30 characters and 3 replications. The plants were inoculated artificially two mounts after transplanting by spraying bacterial suspension (10(8)cfu/ml) onto the pruning sites. Lengths of pith necrosis were evaluated according to 0-5 scale two mounts after inoculation. The yields of the plants were measured for each treatment. In both of the experiments differences in potassium and calcium levels influenced the response of the plants to tomato pith necrosis and significant differences between treatments were observed. Two years results showed that treatments comprising highest levels of potassium (400 ppm) and calcium (120 ppm) not only reduced disease index significantly for most of the bacteria, but also led to the highest yield. http://www.actahort.org/books/808/index.htm
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    Response of Some Tomato Cultivars and Wilt Species of Lycopersicon to Tomato Pith Necrosis
    (Int Soc Horticultural Science, 2009) Ustun, N.; Demir, G.; Saygili, H.; Saygili, H; Sahin, F; Aysan, Y
    In the study reactions of 31 tomato cultivars, 3 rootstock and some wild Lycopersicon (L. peruvianum var. humifusum, L. peruvianum f. glandulosum, L. hirsutum, L. pimpinellifolium, L. esculentum var. cerasiforme, L. chilense) species to tomato pith necrosis caused by Pseudomonas corrugata, Pseudomonas viridiflava, Pseudomonas cichori and Erwinia carotovora subsp. carotovora were determined. The plants grown in pots in greenhouse were artificially inoculated. Severity of the disease was assessed one month after inoculation. None of the cultivars tested were resistant to the strains except cultivars ACE 55 VF and Nun 2048 found resistant to E. carotovora subsp carotovora. In L. peruvianum f. glandulosum and L. peruvianum var humifusum resistance to the strains were determined. http://www.actahort.org/books/808/index.htm