[!lemma=not] [lemma=to | lemma=meet] [!lemma=the] [!tag=□]
[!lemma=not] [lemma=to | lemma=meet] [!lemma=the] [!tag=JJ]
Iron sulfate can also be used to acidify soils . Such knowledge is essential to address emerging public health problems that may arise from exposure to toxic substances . However , the larvae are not considered to be pests . Orange-red spores are released from the pustules and rain splashed or wind blown to nearby leaves , starting new infections throughout the summer . All of these disease organisms will cause iris leaf tips to brown and iris plants to senesce , mimicking symptoms caused by iris borer .