Dryland-agriculture
Guides
Agrotis orthogonia
Pale Western Cutworm Moth, Pale Western Cutworm
Agrotis orthogonia, the Pale Western Cutworm Moth, is a noctuid moth native to dry regions of western North America. Its larvae are subterranean cutworms that feed on the stems of wheat and other small grains just below the soil surface, causing significant agricultural damage during outbreaks. The species prefers loose, sandy, dry, or dusty soils and is particularly associated with wheat production systems. Adult moths emerge in late summer and fall, with most eggs hatching in late winter or early spring.
Petrobia
brown wheat mite, oxalis mite
Petrobia is a genus of spider mites in the family Tetranychidae, containing 34 described species. The genus includes several economically important agricultural pests, notably P. latens (brown wheat mite) and P. harti (oxalis mite). Species are distinguished by morphological features including elongated first leg pairs, pad-like claws with hooked empodia, and distinctive prodorsal setae arrangements. The genus is divided into three subgenera: Mesotetranychus, Petrobia, and Tetranychina, differentiated primarily by peritreme structure and dorsal setae characteristics.