The effect of thermal and chemical treatment on seed-born inoculum of Pyrenophora graminea, the causal agent of barley strip disease in greenhouse

Subject Areas :

Soleiman  Jamshidi ¹ ()
Mehrdad  Abdi ² (faculty member of Azad Islamic University of Miyaneh)
Ali  Faramarzi ³ (faculty member of Azad Islamic University of Miyaneh)

Received: 2005-04-06 Accepted : 2005-05-18 Published : 2005-06-21

Keywords: chemical control, Pyrenophora graminea, Barley strip disease, seed disinfection, termotherapy, seed-born diseases,

Abstract :

Barley strip disease caused by Pyrenophora gramineae  is found in most of barley growing areas in the world and most part of Iran. This foliar disease  in barley  causes emptiness and extreme weakness of seeds and considerable yield losses. The disease is monocycle and seed-born and the fungus survives as mycelium in the hull,   pericarp and seed coat. Therefore,  the best way for disease controlling  is the eradication of seed born inoculum by different methods. In order to evaluate the effect of various thermal  and chemical  treatments on disease  control,  infected   seeds were  collected   from diseased  barley  fields  with  Prop star cultivar  and the infection   percent  was defined  approximately   89.5% with "Culture  plate test"  method. Thermal  treatments consisting  of  tennothcrapy  during  5  and  I 0 minutes  in  52 oC warm  water and chemical  treatments  with Carboxin-Tiram,   lrnazalil,  Mancozeb, Tilt and Maneb were applied.  Infected  seeds treated  with lap water were  considered  as  control  and  the project ran  in  completely  randomized  design.  For each  treatment,  20 treated seeds were sawed in three replications  in pots.  60 days after planting, the effects of various treatments on fungus seed-born inoculum and seed viability were studied by evaluation  of infected plant  percentage. The thermal  treatments were recognized to be unsuitable for seed disinfection   because of extraordinary and over than 50% effects  on seed viability   and low  effect  of disease control. Among chemical  treatments, lmazalil was the best  for disease  control and other treatments had significant  difference  with it. But there were no significant  differences  between  the  other  fungicides.  But application  of  Tilt  is  not  advisable  because  its significant effect on seed viability.

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