Organic 18 Август 2014

Имазалилсодержащие протравители для зерновых колосовых культур

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И.Н. ГОРИНА,

ведущий научный сотрудник лаборатории анализа пестицидов

Всероссийского НИИ защиты растений МСХ РФ

Качественное протравливание се­мян на 60-100 % ограничивает про­явление семенной инфекции и на 30-80 % - первичной аэрогенной инфекции, содержащейся в почве и пожнивных остатках. Кроме того, при нанесении препарата целенап­равленно на защищаемый объект сводится к минимуму отрицатель­ное влияние на компоненты агроценоза за счет снижения пестицидной нагрузки. Поэтому протравливание семян считается первым и очень важным стратегическим приемом в формировании оптимального фито- санитарного состояния посевов.

В последнее десятилетие в ряде стран (Великобритания, Бельгия, Германия, Россия, Франция и др.) наблюдается снижение эффектив­ности протравителей, которое обус­ловлено проявлением к ним полевой резистентности у патогенов. Так, у грибов рода Fusarium отмечена ре­зистентность к бензимидазолам, у возбудителей мучнистой росы, септориоза - к триазолам. Мно­гократное применение протравите­лей, содержащих действующие ве­щества, относящиеся к одному и тому же химическому классу, спо­собствует развитию резистентнос­ти, которая может стать устойчивым генетическим признаком, стреми­тельно распространяющимся в по­пуляции грибов. Со временем чис­ло возбудителей с повышенной ус­тойчивостью начинает преобладать в популяции, и все фунгициды с од­ним и тем же механизмом действия могут оказаться в равной степени бесполезными в борьбе с ними. Риск возникновения резистентнос­ти снижается при использовании комбинированных протравителей. Для предупреждения ее развития в схемы проведения предпосевных обработок рекомендуется включать действующие вещества с различны­ми механизмами действия.

В последние годы на рынке пести­цидов появилось много комплекс­ных протравителей с многосторон­ней фунгицидной активностью.

Заметное место среди них зани­мают имазалилсодержащие препа­раты, которые включают также тебу- коназол, тиабендазол и флутриафол в разных сочетаниях. Они рекомен­дованы для предпосевной обработ­ки семян зерновых культур, подсол­нечника, сои,рапса против комплек­са болезней.

Имазапил относится к группе имидазолов (класс азолов), обладает локально-системным действием, защищая корни. Он отличается ис­ключительно высокой активностью против возбудителей фузариозной и гельминтоспориозной корневых гнилей, а также против патогенов, устойчивых к бензимидазолам; про­являет долгосрочное воздействие против аэрогенной инфекции, на­пример, мучнистой росы (на ранних этапах проявления); высокоэффек­тивен против пиренофоры. Однако из-за высокой опасности для водно­го биоценоза, оральной ингаляци­онной токсичности для млекопитаю­щих и сильного раздражающего действия на глаза и кожу его приме­нение ограничивается включением в состав препаратов для обработки семян только с целью расширения спектра действия. Присутствие имазалила в комбинированных протра­вителях снижает вероятность воз­никновения резистентности. Тебуконазол и флутриафол, представля­ющие группу 1,2,4-триазолов (класс азолов), обладают системно-транс- локационным действием и успешно уничтожают инфекцию как на повер­хности семян, так и внутри зерновок. В целом препараты этой группы вы­сокоэффективны против твердой и пыльной головни, значительно сни­жают пораженность гельминтоспо­риозной корневой гнилью, особен­но на начальных этапах роста и раз­вития, но малоэффективны против плесневения. Они также обладают рострегулирующими свойствами. В связи с тем, что у ряда видов грибов зарегистрирована устойчивость к триазолам, в отношении тебукона- зола и флутриафола возможно воз­никновение перекрестной устойчи­вости. Тиабендазол, относящий­ся к классу бензимидазолов, менее подвижен, чем тебуконазол и флут­риафол. Хорошо действует против возбудителей головневых болезней, корневых гнилей, а также снежной плесени. За счет перемещения в молодые органы проростка защи­щает культуру от болезней вегета­тивных органов на первых этапах роста и развития растений.

В настоящее время в Российской Федерации применяются 10 двух- и трехкомпонентных протравителей семян зерновых культур, содержа­щих имазалил. Одни из них (булат, скарлет, ориус, грандсил ультра) включают действу­ющие вещества из двух химических групп - 1,2,4-триазолов и имидазо лов; другие (клад, доспех 3, стингер трио, анкер трио, тритон, винцит форте) представлены компонента­ми трех групп и содержат еще тиа­бендазол из группы бензимидазо­лов.

В хозяйствах Московской и Тульс­кой областей протравливание семян ячменя 3-компонентным фунгици­дом винцит форте снижало на 93 % развитие корневых гнилей и на 97 % прикорневой гнили. Защитный эф­фект препарата отмечался до фазы начала трубкования. Высокую эффективность (95-100 %) проявля­ет препарат и в отношении патогенов, вызывающих плесневение се­мян.

Биологическая эффективность протравителя скарлет против возбу­дителей корневых гнилей ярового ячменя пивоваренного назначения в условиях Воронежской области со­ставила в среднем 69 %, что позво­лило отнести препарат в группу ли­деров.

Высокую биологическую эффек­тивность в защите яровых зерновых культур от корневых гнилей в Бело­руссии проявил 3-компонентный препарат клад, включающий дей­ствующие вещества из разных групп. Снижение развития фузари- озной корневой гнили в фазе куще­ния в 2006-2010 гг. на пшенице со­ставляло в среднем 72-86 %, на яч­мене - 61-86 %, что явилось одним из лучших результатов при сравни­тельной оценке протравителей.

В целом, комбинации имазалила с флутриафолом, тебуконазолом, тиабендазолом обладают синергичес- ким эффектом против наиболее трудноконтролируемых болезней, передающихся через семена и поч­ву. Кроме того, наличие действую­щих веществ с различными меха­низмами действия снижает до мини­мума риск появления резистентных форм патогенов. Присутствие имазалила в препаративных формах усиливает действие протравителей против корневых гнилей и плесневения семян.

 

Защита и карантин растений. 2013. № 4. С. 55-57.

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    Johnson Вторник, 26 Март 2019 02:49

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