تأثیر تیمارهای حرارتی و شیمیایی بر مایه آلودگی بذر زاد قارچ Pyrenophora graminea عامل بیماری لکه نواری جو در شرایط گلخانه
محورهای موضوعی : بوم شناسی گیاهان زراعی
سلیمان جمشیدی
1
,
مهرداد عبدی
2
,
علی فرامرزی
3
1 -
2 - دانشگاه آزاد اسلامی میانه
3 - دانشگاه آزاد اسلامی میانه
کلید واژه:
چکیده مقاله :
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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