In an IPM system it is usually as we approach Pink Lady maturity that we start seeing the worst of the fruit damage. This autumn, a lot of Harlequin bug activity was recorded in the Batlow district of NSW. As seen in the photos below, juvenile bugs were clustering on timber hail netting posts in a Fiero block that had been harvested.
There is no effective (registered) treatment to control this apple pest, so most of the suggested IPM approach to control is through cultural practices such as weed control.
Here’s a link to a NSW DPI PrimeFact that I wrote some time ago which includes some advice on cultural practices that will help keep the numbers down: https://www.dpi.nsw.gov.au/agriculture/horticulture/pomes/pests-etc/harlequin-bug
Article reviewed by David Williams (Agriculture Victoria)