Troubleshooting
Australian Cycad problems — and how to fix them
Australian Cycad (Cycas media) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Scale insects (cycad scale / Aulacaspis yasumatsui)
Cycad Aulacaspis scale causes white encrustation on fronds, petioles, and roots leading to frond yellowing and plant death if untreated; treat with multiple applications of horticultural oil and systemic insecticides.
Root and crown rot
Caused by Phytophthora or Pythium in waterlogged soil; affected plants decline rapidly with yellowing fronds and a soft, discoloured crown — there is no cure once advanced, prevention through sharp drainage is essential.
Manganese deficiency
New fronds emerge with interveinal chlorosis and may be stunted or distorted — common in alkaline substrates; apply chelated manganese and adjust soil pH downward slightly.
Prevent australian cycad problems before they start
Most australian cycad issues are care-mismatch, not bad luck. Dial in the basics:
Looking for australian cycad in general rather than its problems? Read the full australian cycad care guide — light, water, soil and feeding.
Australian Cycad problems — FAQ
Why is my australian cycad scale insects (cycad scale / aulacaspis yasumatsui)?
Cycad Aulacaspis scale causes white encrustation on fronds, petioles, and roots leading to frond yellowing and plant death if untreated; treat with multiple applications of horticultural oil and systemic insecticides.
Why is my australian cycad root and crown rot?
Caused by Phytophthora or Pythium in waterlogged soil; affected plants decline rapidly with yellowing fronds and a soft, discoloured crown — there is no cure once advanced, prevention through sharp drainage is essential.
Why is my australian cycad manganese deficiency?
New fronds emerge with interveinal chlorosis and may be stunted or distorted — common in alkaline substrates; apply chelated manganese and adjust soil pH downward slightly.