Damon Mcknight
If you're growing passionfruit in Australia, you may encounter a variety of pests that can damage your plants. Some common culprits include passionvine hoppers, which are native to Australia and can cause significant damage by sucking sap from stems and leaves, leading to stunted growth, leaf yellowing, and fruit drop. Other potential pests include ants, grasshoppers, slugs, snails, and even possums. To protect your passionfruit plants, it's important to identify the specific pest and implement appropriate control measures, such as hosing off pests, applying insecticides, or improving garden hygiene.
| Characteristics | Values |
|---|---|
| Insects | Passionvine hoppers, fruit flies, grasshoppers, ants, slugs, snails, sap-sucking insects (scale, mealy bugs), black-headed sugar ants, earwigs, bees |
| Symptoms | Wilting, yellowing, stunted growth, leaf drop, dead spots on leaves, brown or green blotches on fruit, scabby fruit, holes in foliage, black powdery substance on leaves, stems and trunk |
| Treatment | Pruning, spraying with copper-based fungicide, hosing off insects with water, spraying with chilli and garlic, spreading Vaseline around the plant, applying a row of scoria, using paper or fine mesh cloth bags to cover fruit, picking ripe fruit, removing diseased fruit and vines |
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What You'll Learn
Grasshoppers, ants, and other insects
To prevent grasshoppers and ants from damaging your passionfruit plants, you can try natural sprays or repellents. Some people have found success with pyrethrum, a natural insecticide, although it may need to be reapplied frequently. Another option is to spread crushed garlic on the leaves and stems, renewing it daily, as this has been reported to stop leaves from being eaten. Additionally, you can try hosing off any insects, such as passionvine hopper adults and nymphs, which suck sap from the stems and leaves, causing stunting and wilting.
Other insects that may be causing damage to your passionfruit leaves include earwigs, which can quickly destroy young passionfruit vines. To keep them away, you can spread Vaseline around the plant stalk, as they will not cross it. Slugs and snails are also potential culprits, and a row of crushed rock around the plant will deter them.
To identify the specific insects eating your passionfruit leaves, it is recommended to inspect your plants at night with a torch, as some bugs are more active during this time. You can also place crumpled newspaper inside an empty pot at the base of the plant and check every few days for insects that may be hiding there.
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Possums
To prevent possums from eating passionfruit leaves, some methods that have been suggested include:
- Using a net or chicken wire to cover the plants.
- Getting a big dog to scare away the possums.
- Using a potent chilli spray, garlic spray, or a mixture of paprika, garlic, seasoned steak salt, Tabasco, and peanut butter along the fence line.
- Sprinkling blood and bone around the plants.
- Using possum traps.
- Using motion-sensing lights, as possums tend to freeze when a light is shone on them.
Some people have also suggested excluding possums from the area by using an electric fence or a physical barrier, such as a plastic pot with the bottom cut off and placed around the trunk of the vine.
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Slugs and snails
Another effective method to repel slugs and snails is to spread coffee grounds around your passionfruit plant. Caffeine is toxic to these pests, and coffee grounds also improve the quality of the soil. Alternatively, you can try spraying a mixture of hot chilli powder and water on your plant.
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Sap-sucking insects
There are several types of sap-sucking insects that may be affecting your passionfruit leaves. These include:
- Aphids: These tiny insects are known to feed on the sap of phloem, the nutrient-rich tissue that transports the products of photosynthesis throughout the plant. Aphids excrete large amounts of honeydew, a sugar-rich liquid that promotes the growth of sooty mould and attracts ants.
- Leafhoppers: Leafhoppers are xylem feeders, which means they feed on the vascular system that transports water and minerals from the roots of plants to the leaves. They have powerful pumps in their heads that allow them to remove xylem fluid, resulting in large quantities of liquid waste.
- Mealy bugs: Mealy bugs are sap-sucking insects that excrete honeydew and promote the growth of sooty mould. They are identified by their creamy, waxy appearance and are often hidden inside vines.
- Passionvine hoppers: These insects, in both their adult and nymph stages, suck sap from passionfruit stems and leaves, causing stunting, wilting, and leaf drop. They also produce large amounts of honeydew, leading to sooty mould and ant infestations.
To control sap-sucking insects, you can introduce natural predators such as ladybirds, lacewings, praying mantises, and parasitic wasps. Encouraging biodiversity in your garden can help attract these beneficial insects. Additionally, you can try hosing off the insects with water or using horticultural spray oils or insecticides.
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Fruit flies
You can identify a fruit fly issue by looking for small reddish-brown flies stinging your fruit, pinprick holes, and woody lumps on the fruit, as well as dropped fruit. Fruit flies are most active during late summer, with their populations building up in spring as temperatures rise.
To control fruit flies, good garden hygiene is essential. Remove and dispose of any rotting or fallen fruit, either by sealing it in a plastic bag and leaving it in the sun for a week or placing it in a freezer for two days. This prevents the maggots from developing and leaving the fruit. Additionally, you can use pheromone-based traps to monitor and trap fruit flies. These traps contain a bait mixture of fruit juice and cloudy ammonia, which attracts and captures the flies.
To protect your passionfruit from fruit flies, use paper or fine mesh cloth bags to cover the maturing fruit. This physical barrier prevents the flies from stinging the fruit. It is also recommended to harvest your passionfruit before late summer, as this is when fruit fly activity is at its peak.
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Frequently asked questions
There are several pests that are known to eat passionfruit leaves in Australia. These include:
- Passionvine hoppers
- Possums
- Ants
- Grasshoppers
- Slugs and snails
- Fruit flies
The adults are small, brown, moth-like insects roughly 1cm long with transparent triangular wings bearing a mottled brown pattern. The nymphs are pale pink with brown markings, and a tuft of white, waxy filaments on their abdomen ends.
Passionvine hoppers pierce the plant's vascular system and suck out plant fluids to extract sugars. They excrete excess water and sugars as honeydew, a sticky clear substance that attracts other insects such as ants and can lead to sooty mould, which is detrimental to plant health.
To get rid of passionvine hoppers, spray your plants with an insecticide early in the morning when the pests are less active. You can also prune off any leaves or stems infested with eggs and hose off any parts of the plant covered in honeydew.
To prevent pests from eating your passionfruit leaves, you can try spreading Vaseline around the plant stalk to keep earwigs away and putting a row of scoria (crushed rock) around the plant to keep snails and slugs away. You can also try spraying the plant with a chilli and garlic spray to deter insects.
