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Dayfeeding armyworm in pasture, maize and sorghum

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The term armyworm is derived from the spectacular movement of large numbers of larvae (armyworms) to new feeding areas once an area is eaten out... The solitary phase occurs when larvae are reared in solitary conditions: these larvae show a considerable range of colour variations and are not prone to excessive movement... The movement of either ill-defined or well-defined groups of larvae across a paddock, together with the habit of feeding during daylight hours, led to the name dayfeeding armyworm...
GRDC Taxonomy: