Botanic Garden >> Gardening > >> Question and Answer >> Plant Diseases

Pomelo Tree Hijacked by Sour Orange Rootstock: Graft Takeover Confirmed

Pomelo bears small, crinkled, sour/bitter fruit. Citrus fertilizer didn't help. Tree 5 ft, heavy bloom.

Diagnosis: Rootstock Coup

Look at trunk base: a swelling/graft union. Shoots below it = sour orange rootstock (common for pomelo). It outcompetes the scion—your pomelo is gone.

Lesson

Any growth below graft union must be removed immediately. Once rootstock dominates, reversal is impossible. Replant new pomelo; police the graft line religiously.

Plant Diseases: Stone Fruit Pest Management: Neem Oil for Plum/Peach and Poison Ivy Control; Pecan Tree No Nuts: Water, Zinc, Fertilizer, Pruning Guide; Nectarine Fruit Drop at Quarter Size: Natural June Drop; Preventing Sycamore Fruit (Seed Balls) with Florel; Loquat Tree Fruiting from Seed; Identifying and Treating White Grubs at Fruit Tree Roots; 12-Year Pummelo from Seed Never Fruits: Grafted Wood Needed, Proper Feeding; Tree Identification in Phoenix: Why Local Expertise Matters; Identifying a Prunus Tree in Oklahoma: Peach, Plum, Apricot, or Apple?; Complete Guide to Growing and Caring for Pomelo Trees

Garden Articles

Bark Splitting and Sap Flow in Fruit Trees and Maples: Sunscald Management

Brown Spots Inside Green Apples: Disease or Physiological Issue?

Key Lime Scale and Greening: Organic Approach with Atomic Grow

Lemon Fruit Small with Dry Dark Indent: Environmental, Not Disease—Need More Info

Meyer Lemon Fruit Drop: Post-Bloom Stress and Fungus

Peach Leaf Curl on Fruit Salad Tree: Diagnosis and Prevention

Remove Rotten Apples from Orchard to Reduce Disease

Plants

Key Lime Fruit Drop: Water Consistency and Pollination Boost

Dwarf Plum Powdery Mildew and Apricot Bacterial Spot

Nectarine Fruit Rot and Branch Dieback: Atomic Grow Rescue

Buddha's Hand Citrus Fruit Drop: Water, Maturity, or Fungus

Lemon Blossom End Rot: Fungus Treatable with Atomic Grow

Peach Tree Sudden Leaf Drop: Check for Cold Shock

Peach Leaf Reddish Blisters: Nitrogen Deficiency or Disease?