При избытке железа молодые листья томата становятся хлоротичными, а жилки остаются зелеными — на желтой ткани листа образуется тонкая зеленая сетка. Рост растений замедляется, вновь образующие листья остаются мелкими. У огурца листья, а затем и жилки приобретают лимонно-желтую или желто-белую окраску. Точки роста не развиваются. Заболевшие растения резко снижают продуктивность, а иногда погибают.
Впрочем, подобное изменение внешнего вида растений может быть вызвано и другими причинами — воздействием низких температур, пестицидов, недостатком или избытком влаги. Болезни и вредители часто вызывают сходные симптомы, поэтому визуальная диагностика должна подтверждаться химическим анализом.
Источник: supersadovod.ru
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