Although most perennials have few major disease or insect problems, several pests can attack them. These pests vary in type and severity from area to area and year to year. You can control most of them effectively if you follow these general recommendations:

  • Buy plants that are free of diseases and insects.
  • Buy disease-resistant species when available.
  • Keep your garden free of weeds, fallen leaves, and diseased or insect-infested plants.
  • Remove seriously diseased or insect-infested plants as soon as you notice them.
  • Apply fungicides and insecticides only as needed.

If a serious problem develops, consult your local garden center or Cooperative Extension office for the best control methods. Select natural or processed pesticides by studying the information below and on pesticide container labels. Follow label directions for dilution and care in handling.

Three types of pesticides are used on perennials: fungicides for diseases, insecticides for insects and miticides for spider mites. These are usually applied as dusts or sprays. Some come ready to use.

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