Migrations of the Silver-Y Moth (Plusia gamma) in Great Britain

Fisher, Katherine

doi:10.2307/1157

Cited by 15 publications

(13 citation statements)

References 1 publication

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“…There is, however, some evidence for southward return movement in autumn in A. gamma (Fisher, 1938) and also in other noctuids (Spitzer, 1972;Lingren et a!., 1979). Furthermore, mark-and-capture experiments have provided unequivocal evidence of return migration over 800 km by M separata in China (Li et al, 1964).…”

Section: Genetic Regulation Of Prpmentioning

confidence: 99%

Genetic control of the pre-reproductive period in Autographa gamma (L.) (Silver Y moth) (Lepidoptera: Noctuidae)

Hill

Gatehouse

1992

Heredity

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Adults of the noctuid moth Autographa gamma undertake seasonal migrations into areas where they are unable to breed continuously. Individuals migrate into Britain each spring and offspring of these migrants probably return in autumn to over-wintering areas in North Africa and the Middle East, although the existence of these return migrations has been questioned. Insects usually migrate during the adults' pre-reproductive period (PRP). The length of this period is therefore an index of migratory potential because individuals with longer PRPs have more time to express their potential for flight and to travel further. Significant, positive full-sib correlations showed that female offspring with long PRPs came from families where their brothers had correspondingly long PRPs. This suggests that the same genes control the rate of reproductive development in both sexes. There was a rapid response to selection for short and long PRP, with separation of the lines by the second generation of selection. Sib-analysis and parent-offspring regressions showed that the genes with the greatest influence on PRP are X-linked, although there is also an autosomal influence. The significance of X-linkage of genes controlling the PRP is discussed in relation to the migratory strategy of A. gamma.

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Section: Genetic Regulation Of Prpmentioning

confidence: 99%

Genetic control of the pre-reproductive period in Autographa gamma (L.) (Silver Y moth) (Lepidoptera: Noctuidae)

Hill

Gatehouse

1992

Heredity

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“…In the current study we focus on the silver Y moth Autographa gamma (L.) (Lepidoptera: Noctuidae), which causes yield losses in spinach and many other Weld crops (Braun 1963;Fankhänel 1963;Harakly 1975;Legrand and Wauters 1997;Steiner 1997) due to mass reproduction and immigration (Fisher 1938;Vojnits 1969). A 4 year Weld monitoring on spinach Welds shows that highest caterpillar densities are frequently found in July (Klug 2006).…”

Section: Introductionmentioning

confidence: 99%

Performance of two Trichogramma brassicae strains under greenhouse and field conditions for biocontrol of the silver Y moth in spinach cultures

Klug

Meyhöfer

2008

J Pest Sci

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The suitability of Trichogramma brassicae Bezd. (Hymenoptera: Trichogrammatidae) to control the silver Y moth, Autographa gamma (L.) (Lepidoptera: Noctuidae) in spinach was investigated under greenhouse and Weld conditions. Two strains of T. brassicae were selected to study host searching eYciency and dispersal ability of the wasps on spinach. The experiments were conducted with deWned release densities. The results show that T. brassicae strain I failed to locate host eggs in all experiments. In contrast, T. brassicae strain II females were able to locate 37% of the exposed egg clusters in the greenhouse within 48 h. Individuals colonised rapidly at least an area of 0.25 m 2 . At distances up to 26 cm to the release point of the T. brassicae females, parasitization rate was 100%. Moreover, under Weld conditions silver Y moth eggs were exposed two times for 48 h on 12 experimental plots of 100 m 2 in two spinach Welds. During the Wrst exposure interval, i.e. 4 days after mass release of T. brassicae strain II, overall parasitization rates reached 20% on both Welds. Furthermore parasitization rates still reached 16 and 19% during the second exposure interval, i.e. 9 days after natural enemy release, indicating a constant Trichogramma activity over time. Parasitization rates were highest in the close vicinity of the release point, i.e. 86%, whereas 6.5 m away the mean parasitization rate decreased to 3%. In conclusion results indicate a high potential of T. brassicae strain II as antagonist of A. gamma. Nevertheless the dispersal ability of T. brassicae strain II was limited, but adjustment of release densities and techniques might compensate this disadvantage.

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“…Adults undertake seasonal northward migrations to areas where they are unable to breed continuously. Individuals migrate into Britain each spring, and after one, two or three generations, descendants of the spring migrants probably return to over-wintering sites in North Africa and the Middle East (Fisher, 1938). However, the existence of return migrations by insects to over-wintering sites has been questioned (Rabb & Stinner, 1978;Stinner et al, 1983).…”

Section: Introductionmentioning

confidence: 99%

Phenotypic plasticity and geographical variation in the pre‐reproductive period of Autographa gamma (Lepidoptera: Noctuidae) and its implications for migration in this species

Hill

Gatehouse

1993

Ecological Entomology

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Abstract. Adults of the noctuid moth Autographa gamma undertake seasonal migrations into areas where they are unable to breed continuously. Individuals migrate into Britain each spring, and offspring of these migrants probably return in autumn to over‐wintering areas in North Africa and the Middle East. However, the existence of these return migrations has been questioned. Insects usually migrate during the adults' pre‐reproductive period (PRP). The length of this period is therefore an index of migratory potential since individuals with longer PRPs have more time to express their potential for flight and to travel further before becoming sexually mature. Offspring of insects from Morocco, Britain and Germany showed that, under both long and short photoperiods, PRP increased with latitude over the range 34–53°N. There were significant genotype—environment interactions in the effect of photoperiod on length of PRP. However, PRPs of offspring from insects collected in Sweden were no different under a long photoperiod from those of offspring collected further south, and were significantly shorter under a short photoperiod than those of insects from Morocco. With the exception of Swedish moths, offspring from insects collected at higher latitudes had longer PRPs and, therefore, the potential to travel further during migrations. The ability of some individuals to respond to environmental cues signalling habitat deterioration will further increase their potential to return to over‐wintering areas further south.

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Migrations of the Silver-Y Moth (Plusia gamma) in Great Britain

Cited by 15 publications

References 1 publication

Genetic control of the pre-reproductive period in Autographa gamma (L.) (Silver Y moth) (Lepidoptera: Noctuidae)

Genetic control of the pre-reproductive period in Autographa gamma (L.) (Silver Y moth) (Lepidoptera: Noctuidae)

Performance of two Trichogramma brassicae strains under greenhouse and field conditions for biocontrol of the silver Y moth in spinach cultures

Phenotypic plasticity and geographical variation in the pre‐reproductive period of Autographa gamma (Lepidoptera: Noctuidae) and its implications for migration in this species

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