Troubleshooting
Grapefruit problems — and how to fix them
Grapefruit (Citrus paradisi) 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.
Granulation (dry, mealy flesh)
Caused by water stress during fruit swell or excessively hot, dry conditions at harvest. Consistent irrigation and harvesting at peak ripeness minimise this defect.
Citrus leafminer
Silvery serpentine trails on new leaves indicate larval mining. Remove and destroy affected flushes; apply a kaolin clay barrier or spinosad-based spray on new growth.
Iron/manganese deficiency
Interveinal chlorosis on young leaves in high pH soils. Acidify soil with sulfur and apply chelated micronutrient sprays; use acidifying citrus fertiliser.
Prevent grapefruit problems before they start
Most grapefruit issues are care-mismatch, not bad luck. Dial in the basics:
Looking for grapefruit in general rather than its problems? Read the full grapefruit care guide — light, water, soil and feeding.
Grapefruit problems — FAQ
Why is my grapefruit granulation (dry, mealy flesh)?
Caused by water stress during fruit swell or excessively hot, dry conditions at harvest. Consistent irrigation and harvesting at peak ripeness minimise this defect.
Why is my grapefruit citrus leafminer?
Silvery serpentine trails on new leaves indicate larval mining. Remove and destroy affected flushes; apply a kaolin clay barrier or spinosad-based spray on new growth.
Why is my grapefruit iron/manganese deficiency?
Interveinal chlorosis on young leaves in high pH soils. Acidify soil with sulfur and apply chelated micronutrient sprays; use acidifying citrus fertiliser.