Studies on interaction of varieties, irrigation regimes and planting types on early blight disease of potato

Subject Areas : دو فصلنامه تحقیقات بیماریهای گیاهی

M. A. Karimkhah, ¹ (دانشجوی کارشناسی ارشد، دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران، تهران، ایران)
M. Nasr Esfahani, ² (دانشیار پژوهش، مرکز تحقیقات کشاورزی و منابع طبیعی اصفهان، اصفهان، ایران.)
A. Mohammadinejad, ³ (استادیار دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران، تهران، ایران)

Received: 2014-08-26 Accepted : 2014-08-26 Published : 2014-05-22

Keywords: variety, Alternaria alternata, early blight disease, Irrigation, Potato,

Abstract :

The early blight disease caused by Alternaria alternata and A. solani with dominancy of
A. alternata is one of the important diseases in the potato growing areas of Iran causing
economic losses every year. Experiments were conducted during 2008-2009 to study the
interactions of potato varieties, irrigation and planting types on the incidence and the severity
of disease in Freidan area, Isfahan province, in a split split plot design on a susceptible potato
variety, Agria. The severity of the early blight disease was assessed in 6 classes of infections
and/or scoring scales: 0, 10, 25, 50, 75 and 100 at two growth stages; before and after
flowering. The infection severity percentages and scoring scale of the disease were
determined. The results indicated that, almost all the three factors had a very highly
significant effect on the incidence and the severity of the early blight disease. The tested
varieties showed significantly different reactions to the disease where disease severity in
varieties Marfona and Agria was 12.99 and 28.31%, respectively. Also, Sprinkler and tip
irrigation with 14.48 and 16.59% disease severity were significantly different general
irrigation (30.21%). No significant effect was observed between planting types since disease
severity was 20.61 and 20.71% in single row and double row planting, respectively. The
interactions of variety × irrigation, planting types × irrigation, and year had significant effect
in disease severity (25.74, 5.62 and 13.53% respectively). The interactions of the above
factors also showed a very highly significant effect. The average yield of Agria and Marfona
was 24.03 and 23.13 t/ha, respectively. Our results indicated that the severity and
development of disease was more in general irrigation than in sprinkler and tip irrigation. The
results indicate that resistant varieties can significantly reduce disease development and
severity. However, a single-row and double-row planting had no significant effect on disease
reduction.

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