Plant Doctor Archive

Katydids on my citrus

Something is eating the my citrus trees. I can't see any, but I'm told it could be katydids. Do you think it is likely to be these? How do I get rid of them organically?

Yes, it is likely to be these insects. Katydids are from the locust family. Citrus is one of their plants of choice — devouring buds, leaves and flowers.

They are hard insects to catch because they are green and blend in with the foliage. They are nocturnal, flying at night, which will explain why you haven't seen any (or only one). They shelter in long grass, so remove or cut down any long grass where they like to hide.

Organic controls you could try — plant calendula as a barrier; horehound around your citrus as a deterrent; spray with garlic oil as a repellent. Neem Oil may be effective in disrupting insect growth. Whichever method of control you choose, you will need to repeat applications at regular intervals.

More on Katydids

Advice by Dr Dan Blanchon from Unitec's Diploma in Sustainable Horticulture and Bachelor of Resource Management.

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