یکی از بیماریهای مهم خیار (Cucumis sativus)، بیماری سفیدک پودری است که توسط گونه قارچی Golovinomyces cichoracearum ایجاد میشود. در این تحقیق، کارآیی دو قارچکش گیاه-پایه میلدیوکات (EC 13%) در دُزهای چهار، پنج و شش گرم در لیتر و آلیسین (ME 5%) در دُزهای 5/0، یک و 5/1 گرم در لیتر علیه بیماری سفیدک پودری خیار در شرایط گلخانه ارزیابی و با قارچکش سیدلیتاپ با دُز 75/0 گرم در لیتر و شاهد (آب) مقایسه گردید. این تحقیق در قالب طرح بلوکهای کامل تصادفی با هشت تیمار و سه تکرار در دو استان تهران و خوزستان اجرا شد. اعمال تیمارها با مشاهده علائم بیماری آغاز و بهفاصله هفت تا 10 روز یک بار تکرار شد. ارزیابی شدت بیماری بهروش هورسفال و بارات و با سیستم نمرهدهی یک تا هفت انجام شد. میانگین دادههای هر دو منطقه نشان داد که قارچکش آلیسین در غلظتهای یک و 5/1 گرم در لیتر بهترتیب کارآیی مهار 83 و 08/88 درصد و قارچکش میلدیوکات در غلظتهای پنج و شش گرم در لیتر، بهترتیب کارآیی مهار 6/84 و 6/86 درصد و قارچکش سیدلی تاپ کارآیی مهار 7/82 درصد داشتند. با توجه به نتایج این تحقیق، ترکیبات گیاه-پایه میلدیوکات در غلظت پنج گرم در لیتر و آلیسین با غلظت یک گرم در لیتر میتوانند بهعنوان جایگزین یا در تناوب با قارچکشهای شیمیایی برای مهار بیماری سفیدک پودری خیار مورد استفاده قرار گیرند. شروع محلولپاشی بهمحض مشاهده علائم بیماری و طی دو تا سه نوبت و بهفاصله هفت تا 10 روز توصیه میشود.
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