The cabbage moth (Mamestra brassicae) is primarily known as a pest that is responsible for severe crop damage of a wide variety of plant species. The common name, cabbage moth, is a misnomer as the species feeds on many fruits, vegetables, and crops in the genus Brassica (i.e. cabbage, broccoli, Brussels sprouts). Other notable host plants include tobacco, sunflower, and tomato, making this pest species particularly economically damaging.
The moth spans a wide geographic range encompassing the entire Palearctic region. Due to this wide geographic region and the presence of various populations globally, local adaptations have resulted in a species with high variability in life history and behavior across different populations.
B. brassicae L. (= albicolon Stph., nec Hbn., ochracea Tutt) Forewing grey-brown varied with fuscous: lines pale, dark-edged; orbicular stigma rounded, reniform large, white-spotted, or filled in with white; hindwing brownish, with a paler mark near end of vein 2. - The insect varies in opposite directions; - ab. albidilinea Haw. is a blackish form with the reniform stigma and submarginal line white, occurring occasionally in Europe as well as in Britain; — scotochroma Rob., a local German form, is melanic, with both wings blackish, much like albidilinea, but without the white submarginal line; — unicolor Tutt has all the markings, dark and light, more or less lost in the fuscous suffusion, the reniform edged only with whitish; — on the other hand andalusica Stgr. from Spain (? = straminea Failla-Ted., from Sicily and Italy) is pale grey- brown with a faint ochreous flush, darker grey in female, with all markings obscured except the 3 stigmata which are strikingly pale, with partial blackish outline, especially on their lower edge, the claviform sometimes grey; — decolorata Stgr. from Issykkul and other localities in Central Asia is pale greyish brown, with the stigmata as in andalusica, but with the markings, especially the submarginal ones, not obsolete; — canescens Moore from Yarkand, which I have not seen, is, judging from the figure, very close to, if not identical with, decolorata which it antedates by 10 years. Larva polyphagous, varying in ground colour from green to brown and blackish, with broad pale spiracular line; a dorsal hump on segment 11.
The cabbage moth has a wide geographic distribution across parts of Europe and Asia ranging from about 30°N to 70°N in latitude. This geographic range is within the Palearctic region, which includes parts of Europe, Asia north of the Himalayan Mountains, and Africa north of the Sahara Desert. As many host plants are both endemic or domesticated in various parts of this region, the moth is able to successfully thrive in nearly all parts of this region due to local adaptation (Masaki).
While the moth is generally limited to this range, there is a threat that it could be introduced to new regions through global food trade industries involving live plant imports.
The life history is highly variable depending on the location of the population. Some populations are able to fit two to three generations within one calendar year. Other populations, in less favorable climates, may have only one generation in a given year. Diapause is this species' most variable life stage, lasting anywhere from 80 days to six months if needed over the winter.
A study of M. brassicae in East Asia demonstrated that the species is migratory. Researchers found that annual migration across a 40–60 km strait. Data also indicates that females migrate more than males, with a significantly higher proportion of captures being female compared to the population sex ratio during the months of May to September. Coupled with the finding that these migratory females had high ovarian development and mating rate during this time, researchers concluded that this migration promoted female sexual maturation prior to mating. This would allow females to mate and oviposit in their newly arrived upon territories.
Here is a list of the known and recorded food plants for Mamestra brassicae:.mw-parser-output.div-col{margin-top:0.3em;column-width:30em}.mw-parser-output.div-col-small{font-size:90%}.mw-parser-output.div-col-rules{column-rule:1px solid #aaa}.mw-parser-output.div-col dl,.mw-parser-output.div-col ol,.mw-parser-output.div-col ul{margin-top:0}.mw-parser-output.div-col li,.mw-parser-output.div-col dd{page-break-inside:avoid;break-inside:avoid-column}
See Robinson, G. S. et al.
Mating in M. brassicae occurs among recently emerged adult moths. In one controlled observation, adults began mating the first night of emergence. In this observation, mating behavior started at ten in the evening, with most mating activity occurring after midnight. Mating pairs remained associated for upwards of twelve hours, with females covering male wings with the posterior of their body during this time. The pattern of mating is as follows:
