How to revive struggling passionfruit vine?

BulaFiji

Can someone help me with my passion fruit vine. It's been in for less than a year and has flourished and grown well except for the last couple of months. It hasn't flowered, possibly not enough Sun? However the vines  suddenly look terrible and woody, some of the leaves turned yellow and lots have dropped off. Are the vines being internally eaten??? and what can I do. Any info greatly appreciated. 

  

EricL

Hello @BulaFiji 

Thanks for sharing the photos, what you're seeing on your passionfruit vine is sadly not uncommon, and there are a few potential issues contributing to the problem. Based on the image and your description (woody, dried, discoloured stem with yellowing leaves and poor flowering), the most likely culprits are a combination of woodiness virus, stem borer damage, and possibly nutrient or environmental stress.

Here's a breakdown of what could be going on:

1. Stem Borer or Internal Pest
 

The damaged vine in your photo shows hollowing and dry, fibrous peeling, which is characteristic of passion vine hoppers, borers, or caterpillars burrowing into the stems. These pests weaken the plant, reduce sap flow, and cause dieback. If you peel the affected stem and find frass (sawdust-like residue) or bore holes, this confirms insect activity.

To manage this:

• Prune off all affected stems well below the damage (sterilise secateurs with methylated spirits between cuts).
   
• Dispose of infected parts in the bin—not the compost.
   
• Spray the remaining plant with Yates Success Ultra or Eco-Oil as a deterrent for eggs and larvae. Reapply every 7–10 days.
   

2. Woodiness Virus

The lack of flowering, hard woody stems, and leaf yellowing can also point to passionfruit woodiness virus, which is spread by aphids and other sap-sucking insects. It causes poor fruiting and eventual decline. Unfortunately, there's no cure once a vine is infected.

To check: see if new leaves are distorted or very small and tough, another virus sign.

If confirmed, the only real option is to remove the entire vine and start fresh in a new area with resistant rootstock (like grafted varieties), and be vigilant with aphid control early on.
 

3. Lack of Sun, Drainage or Nutrients

Poor flowering and yellowing could also come from insufficient sunlight (passionfruit need at least 6 hours of direct sun daily), or overwatering / poor drainage, especially in cooler months. Nutrient deficiency, particularly nitrogen and magnesium, can cause yellowing too.

To boost recovery:

• Apply Yates Thrive Citrus & Fruit Liquid Fertiliser or Seasol + PowerFeed every 2 weeks.
   
• Mulch around the base to regulate moisture, but avoid piling against the trunk.
   
• Ensure the root zone isn't waterlogged, improve drainage if needed.

If you catch it early and prune hard, your vine may recover if it’s just borers and stress. But if virus symptoms show up or it keeps declining, replacement may be the most practical long-term solution.

If you need further assistance, please let us know.

Eric