Evaluation of resistance to seedling damping-off caused by Phytophthora drechsleri in cucumber cultivars under greenhouse conditions

Author: Khadijeh Nazavari*, Fatemeh Jamali**, Fereshteh Bayat* and Mohammad Modarresi*

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Abstract

Resistance of greenhouse cucumber cultivars was assessed against damping-off caused by Phytophthora drechsleri in Persian Gulf University during 2014-15. Cucumber varieties showed different reactions to disease. Regarding death at 2-3 leaves stage, Barracuda was grouped as very sensitive with 95.87% seedling decay; Sultan, Aseal, Fenomeno, Storm, Number 1 and Kashmir with 77.77, 74.99, 74.99, 73.05, 72.21, 69.43% death respectively were sensitive and PS 547 with 60.83 percent death was semi-sensitive. In the 5-6 leaves stage, Barracuda, Sultan and Number 1 with respectively 71.66, 70.83, 65.41% death were susceptible, and PS 547, Kashmir, Storm, Aseal and Fenomeno with 59.59, 59.41, 55.27 , 55.08, 49.25% percent death, respectively, were moderately susceptible. During flowering stage, Barracuda with 63.28% death was susceptible, Number 1 with 44.22% death was moderately susceptible, Storm, Sultan, Kashmir, Aseal and Fenomeno with respectively 38.88, 29.72, 28.04, 27.77, 24.44% percent

Keywords

Cucumber, Damping-off, Phytophthora, Resistance, Soilborne

Conclusion

Resistance of greenhouse cucumber cultivars was assessed against damping-off caused by Phytophthora drechsleri in Persian Gulf University during 2014-15. Cucumber varieties showed different reactions to disease. Regarding death at 2-3 leaves stage, Barracuda was grouped as very sensitive with 95.87% seedling decay; Sultan, Aseal, Fenomeno, Storm, Number 1 and Kashmir with 77.77, 74.99, 74.99, 73.05, 72.21, 69.43% death respectively were sensitive and PS 547 with 60.83 percent death was semi-sensitive. In the 5-6 leaves stage, Barracuda, Sultan and Number 1 with respectively 71.66, 70.83, 65.41% death were susceptible, and PS 547, Kashmir, Storm, Aseal and Fenomeno with 59.59, 59.41, 55.27 , 55.08, 49.25% percent death, respectively, were moderately susceptible. During flowering stage, Barracuda with 63.28% death was susceptible, Number 1 with 44.22% death was moderately susceptible, Storm, Sultan, Kashmir, Aseal and Fenomeno with respectively 38.88, 29.72, 28.04, 27.77, 24.44% percent

References

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How to cite this article

Khadijeh Nazavari*, Fatemeh Jamali**, Fereshteh Bayat* and Mohammad Modarresi (2016). Evaluation of resistance to seedling damping-off caused by Phytophthora drechsleri in cucumber cultivars under greenhouse conditions , Biological Forum – An Internatio