Insect & Disease ID And Diagnosis Guide: Wilt

Insect & Disease ID And Diagnosis Guide: Wilt

Seeing wilt on your crops? Take a look at these pictures to see common diseases that can lead to wilt.

Scouting tip: When collecting samples for a diagnostic lab, wrap leaf samples in paper towels then place them in plastic bags to prevent them from drying. Enclose a brief crop history and any recent soil and/or foliar analysis.

A wilting fuchsia or poinsettia may indicate Thielaviopsis root rot. Check the root systems for black discoloration.

Poinsettias that wilt suddenly may be girdled by fungus gnat larvae feeding inside the lower stem. Check for black head capsules that distinguish fungus gnat larvae from worms or other insect larvae.

Wilting of geraniums may be due to Ralstonia solanacearum; bacteria will ooze from the xylem of a cut stem.

Wilting snapdragons often indicate Pythium root rot.

Wilt of calibrachoa may indicate infection by any of several fungi, including Phytophthora, Pythium and Thielaviopsis.

Wilting of poinsettias, such as that shown here, indicates root rot from Phytophthora, Pythium or Thielaviopsis.

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