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armyworm feeding: late autumn and winter (low to moderate risk) and late spring
(higherrisk).Armywormscurrentlyincroparelikelytopupateandmigrateawaybefore
the major risk period in spring. For winter outbreaks (during tillering) economic
thresholds of 8-10 larvae per m2 provide a guide for spray decisions. For spring
outbreaks (during crop ripening) spraying is recommended when the density of larvae
exceeds 1-3 per m2 depending on the timing of harvest, green matter available and
larvaldevelopmentstage.
Cutworms
Cutworms(PDF897.3KB)(Agrotisspp.)havebeenreportedfairlywidely,includingat
Woodleigh, Wunkar, Moorook, Bugle Hut, Nangari, Lowbank and Alwawoonaonwheat,
mostly in low numbers only causing minimal damage. Cutworms also reported at
Poocherawereheavilyaffectingcerealsonthesandrisesbutlesssoontheharderflats.
At Wuddina pasture had to be resown in some patches, and a small area of midslope
ground on cereals at Loxton were impacted. Caterpillars have also been observed on
cereals at Tumby Bay, Cleve and Minnipa. Only a few cutworms (alongside low
numbers of armyworms) have been lingering on medic pasture and weeds around
Roseworthy, but numbers are very low and of no concern. They have also been
reportedinmixedpopulationsonagrassandlegumehaycropatKingscote.
Cutwormsareplump,smoothcaterpillarsthathavedistinctlygreasyappearanceanddark
head,growingupto40-50mm.Theyareusuallyquiteuniformincolourandimportantly
lackdistinct stripes andmarkingsalongtheirbodies. Body colourisvariabledepending
on species. Common cutworms have black, green-brown or grey coloured bodies,
pink/brown cutworms have greyish-green to brown with a pink tinge and black
cutworms have dull brown-black coloured bodies. It can be difficult to distinguish
betweenspecies.
Cutwormsaregenerallynocturnalandhideundersoilclodsorlitterduringthedayand
comeoutatnighttofeed,typicallyatgroundlevel.Dayfeedingdoessometimesoccur,
particularlywhentherearehighnumbersofcaterpillars.Itmaytakeonemonthorafull
year to complete a cutworm’s lifecycle depending on the species involved and the
temperature. The critical monitoring period for cutworms is autumn, when large
caterpillarstransferfromsummerandautumnweedsontonewlyemergedseedlings.
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(higherrisk).Armywormscurrentlyincroparelikelytopupateandmigrateawaybefore
the major risk period in spring. For winter outbreaks (during tillering) economic
thresholds of 8-10 larvae per m2 provide a guide for spray decisions. For spring
outbreaks (during crop ripening) spraying is recommended when the density of larvae
exceeds 1-3 per m2 depending on the timing of harvest, green matter available and
larvaldevelopmentstage.
Cutworms
Cutworms(PDF897.3KB)(Agrotisspp.)havebeenreportedfairlywidely,includingat
Woodleigh, Wunkar, Moorook, Bugle Hut, Nangari, Lowbank and Alwawoonaonwheat,
mostly in low numbers only causing minimal damage. Cutworms also reported at
Poocherawereheavilyaffectingcerealsonthesandrisesbutlesssoontheharderflats.
At Wuddina pasture had to be resown in some patches, and a small area of midslope
ground on cereals at Loxton were impacted. Caterpillars have also been observed on
cereals at Tumby Bay, Cleve and Minnipa. Only a few cutworms (alongside low
numbers of armyworms) have been lingering on medic pasture and weeds around
Roseworthy, but numbers are very low and of no concern. They have also been
reportedinmixedpopulationsonagrassandlegumehaycropatKingscote.
Cutwormsareplump,smoothcaterpillarsthathavedistinctlygreasyappearanceanddark
head,growingupto40-50mm.Theyareusuallyquiteuniformincolourandimportantly
lackdistinct stripes andmarkingsalongtheirbodies. Body colourisvariabledepending
on species. Common cutworms have black, green-brown or grey coloured bodies,
pink/brown cutworms have greyish-green to brown with a pink tinge and black
cutworms have dull brown-black coloured bodies. It can be difficult to distinguish
betweenspecies.
Cutwormsaregenerallynocturnalandhideundersoilclodsorlitterduringthedayand
comeoutatnighttofeed,typicallyatgroundlevel.Dayfeedingdoessometimesoccur,
particularlywhentherearehighnumbersofcaterpillars.Itmaytakeonemonthorafull
year to complete a cutworm’s lifecycle depending on the species involved and the
temperature. The critical monitoring period for cutworms is autumn, when large
caterpillarstransferfromsummerandautumnweedsontonewlyemergedseedlings.
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