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Bugwatch: Bronze Orange Bugs

Just when your poor citrus tree thought it would be safe to put on some new growth, finally mustering up the energy to grow again after a long and productive fruiting season, this dreaded pest arrives with its stinky, squirty spray, sucking all the vigour from the new spring shoots. 

Yes, its stink bug time again. But this year we say enough. This year it’s time to put our heads together, find the best weapon and ward them off. This year we mean business!



The dreaded Bronze Orange Stink Bug. Photo - Linda Ross 

 

Symptoms: These prolific pests will damage citrus trees, often causing fruit to drop. Bronze orange bugs will suck the sap from the tree, flowers and fruit will subsequently fall and stems can turn discoloured and die.

Bronze orange bugs are out in force during warmer months. This pest appears first in late winter as a light green nymph, making it hard to spot. As bronze orange bugs develop they change colour into the more familiar orange to bronze. Some bird species will consume these pests but often not enough to control and prevent damage to plants. Assassin bugs will also predate bronze orange bugs, yet still they seem to endure.



Bronze Orange Bug eggs. You can see the bugs inside. These bugs will reproduce rapidly, so one or two could quickly turn into an infestation. Photo - Emily Shepton 


A Bronze Orange Bug emerges from the egg. Photo - Emily Shepton
 
 

The Nymphal bugs appear green, then change to orange with a brown spot in the middle of their backs. Photo - Andy Burton  


Solution: It is best to start your pest management program in early spring while bugs are young. Spray products such as Eco-oil fortnightly to provide an organic defense. Apply good coverage to leaves including their undersides.

If infestation has already begun, or indeed taken hold, spraying with an insecticide is probably unavoidable. Use a naturally based insecticide with natural ingredients including Pyrethrum, like Richgro Beat-a-bug, or Yates Nature's Way Citrus & Ornamental Spray, which is the only spray registered with the APVMA for home garden control of Bronze Orange Bug on edible citrus. Use as a contact spray to knock them down, then treat the foliage with a horticultural soap to deal with the eggs left behind. Insecticides containing Imidacliprid, such as Confidor, will be effective. But the unintended consequences on beneficial insects, like bees, will also be severe. Resist the urge to use Imidacliprid insecticides when citrus are in flower, and never on edible fruit.

Other organic remedies many gardeners employ include sucking up pests with an old vacuum cleaner, removal by hand and drowning them in methylated spirit, or crushing them between planks of wood. But all of these method put the gardener in harm’s way. If you must engage these pests hand-to-hand make sure you wear gloves, long sleeves, protective glasses and a hat or other protective clothing. Bronze Orange Bugs emit a foul-smelling, citric-acid-rich liquid when disturbed and this can be very dangerous, particularly if sprayed in the eyes.

 


The mature Bronze Orange Bug and a nymphal bug underneath. Photo - Jan Anderson 

 

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Comments

Heather Muers commented on 13 Nov 15

Very grateful for this advice - these bugs start to make me feel it's not worth trying to grow my citrus trees. Could u tell me if the bugs eat the flowers, and therefore reduce future fruit crop?
Heather

Helen Wright commented on 12 Nov 15

I live in Brisbane north and I have a 'Lots A'Lemons' lemon, which I am growing in a pot (almost 2 years).
I had about a dozen lemons last season but the skins looked strange and you couldn't use them for zesting, the fruit was otherwise very juicy and I thought plentiful for the size of the plant (70 - 80cms tall).
I try and keep pests at bay and fertilise regularly and mulch the top of the pot, it also gets full sun.
Many thanks for your help, Helen

Margaret Manwaring commented on 11 Nov 15

Hi, Thank you for this article. Yates web page says Confider is not suitable for fruit bearing citrus. Which is correct? I would love to use Confider as my 12 citrus trees are just getting too much to look after.

Paul Macdowell commented on 11 Nov 15

Hi
That was a great story on how to get rid of the pesky stink bugs. Can you give me advice on a gazebo that I can buy that I can grow roses in. So it lets the sun in but has walls to stop the wallabies.I like the wallabies but they eat the flowers. Im in Queensland.

About this article

Author: Linda Ross & Dan Wheatley