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This study addresses the question whether to what extent (if any) light-trap catch of the harmful pest,  Helicoverpa armigera  (Hübner, 1805) (Lepidoptera: Noctuidae) depends on the Moon phases and the geomagnetic horizontal component (H-index). Therefore, daily relative catch data were assigned to the daily values of geomagnetic field above 0.2125 −10  T (H-index). We correlated the daily catch results to the daily values of geometric H-index. The numbers of specimens caught and classified according to generation were calculated relative to catch values. Relative catch data were divided according to the Moon phase angle around the four Moon quarters. The relative daily catch data were assigned to the daily values of geomagnetic H-index. We correlated the daily catch results to the daily values of geometric H-index in four moon phases. More abundant catch corresponded to higher H-index values in the New Moon period. Approaching Full Moon led to increasing catch correlating to low H-index value, but there decreasing catch coincided with higher H-index values. There was also decreasing catch at the increasing H-index values in the First Quarter and Last Quarter period. The light trap catch of the  H. armigera  was seemingly influenced by both the moon phases and the horizontal component of geomagnetism.

Light-trap catch of cotton bollworm, Helicoverpa armigera in connection with the moon phases and geomagnetic H-index