Pasture day moth

Pasture day moth (Apina callisto) has been a significant problem this season, particularly in the South West Slopes region of New South Wales. More reports have come in from various locations which indicates continuing problems. Consultant, Tom Lord (CropFacts P/L), reports pasture day moth caterpillars in cereal crops in parts of the Mallee district of Victoria. Between 3-5 caterpillars per metre square can be observed in some paddocks. Tom says the caterpillars do not appear to be causing any damage to crops at present.   

Agronomist, Matthew Burkitt (Central West Agricentre), has reported pasture day moth caterpillars in a wheat crop near Parkes, in the Central West Slopes and Plains district of New South Wales. Matthew reports 3-4 caterpillars per square metre, with most damage occurring to capeweed found within the paddock. Matthew says they have not caused any visible damage to the wheat crop itself.

Agronomist, Nigel Phillips (NSW DPI), also reports that high numbers of pasture day moth caterpillars have been found in many pasture paddocks around Wagga Wagga, in the South West Slopes of New South Wales. Nigel says that most established pastures have not experienced significant feeding damage, although many newly sown pastures have been affected. In one case, up to 20 caterpillars per square metre were found attacking a newly-sown pasture. Nigel says the caterpillars were causing significant damage to sub clover and were also found attacking phalaris seedlings. The high numbers and extent of feeding damage necessitated chemical control, which Nigel says was achieved successfully using alpha-cypermethrin.

Pasture day moths are generally a sporadic pest and commonly found in pastures. It is unclear why such high numbers have been observed this season, although the mild autumn conditions experienced across many areas may be partly responsible.

Click here for images of pasture day moth caterpillars and refer to PestFacts Issue No. 5 for further information.