Association of Subzero Temperatures, Snow Cover, and Winter Mortality of Grasshopper Eggs in Saskatchewan

Riegert, P. W.

doi:10.4039/ent991000-9

Cited by 11 publications

(8 citation statements)

References 15 publications

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“…The observed total egg mortality of 52% compared reasonably with rates of 46% and as high as 35% attributed by Pickford (1970) and Riegert (1967), respectively, to winter weather in Saskatchewan. The observed daily survival rates for nymphs were similar to, but for adults were slightly higher than, survival rates reported for rather stable infestations of M. sanguinipes at Roundup, MT, during 1975and 1976(Onsager and Hewitt 1982.…”

Section: Discussionsupporting

confidence: 79%

LIFE HISTORY PARAMETERS IN MELANOPLUS SANGUINIPES (F.) IN TWO CRESTED WHEATGRASS PASTURES

Sánchez

Onsager

1988

Can Entomol

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A combination of published techniques provided point estimates of life history parameters for two natural field populations of Melanoplus sanguinipes (F.) in crested wheatgrass pastures. Stage-specific survival rates averaged 0.4798, 0.2261, 0.7628, and 0.6903 for egg, instars I–III combined, instar IV, and instar V, respectively. Daily survival rates of adults averaged 0.9702, but were slightly lower for females than for males. Estimated duration of nymphal instars averaged 8.4 days, the adult preoviposition period averaged 13.3 days, and adult longevity averaged 26.7 and 36.3 days in the two populations. Oviposition rates were estimated for up to four successive ovipositions, and net replacement rates of populations also were estimated. Neither population replaced itself, indicating that potential capacities for increase were not approached under conditions of these studies.

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Section: Discussionsupporting

confidence: 79%

LIFE HISTORY PARAMETERS IN MELANOPLUS SANGUINIPES (F.) IN TWO CRESTED WHEATGRASS PASTURES

Sánchez

Onsager

1988

Can Entomol

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“…One interpretation is that the association is directly causal. In the areas where there is little or no snow cover, soil temperatures can be lethal to eggs (Riegert, 1967). Cold resistant polygenes have been reported in other organisms (e.g.…”

Section: Discussionmentioning

confidence: 99%

Genetic variation in prairie populations of Melanoplus sanguinipes, the migratory grasshopper

Chapco

Bidochka

1986

Heredity

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Genetic variation at two visible loci and 10 electrophoretic loci in populations of the migratory grasshopper, Melanoplus sanguinipes, in the Canadian prairies is described. Tibia colour and femoral stripe loci exhibit considerable geographic variation in frequency. Multiple regression and correlation analyses revealed dma! variation patterns for tibia colour, with minimum annual temperature accounting for about 40 per cent of that variation. The possible direct and indirect effects of this factor are discussed. No spatial patterns were evinced for the femoral stripe locus despite its close linkage to the tibia colour gene. Whatever the nature of selection, coefficients must be large enough to maintain polymorphism and divergence in opposition to the swamping effects of gene flow. This does not appear to be the case for the allozyme loci; frequencies of the most common allele at each locus are high (average heterozygosity =45 per cent) and about the same at each location. Tte mean level of polymorphism, 378 per cent, is well within the range of most insects.

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“…(Guppy 1961) and of the Colorado potato beetle (Leptinotarsa decemlineata (Say)) (CIPR 19: 3, 52; 20: 201; 21: 3) though not always (CIPR 22: 186; 23: 63). On the other hand there can be relatively high winter survival when the snow cover is heavy and snowfall in autumn is early, for the Colorado potato beetle (Strickland 1929(Strickland , 1938Ward 1943;CIPR 35: 45) and for grasshoppers (Riegert 1967).…”

Section: Direct Effects ( a ) On Soil Insectsmentioning

confidence: 99%

Effects of Precipitation on Crop Insects

Beirne

1970

Can Entomol

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Can. Ent. 102: 1360Ent. 102: -1373Ent. 102: (1970 A review and analysis of the literature showed that precipitation, or its absence, can regulate the numbers of or the damage by insect pests of annual crops in Canada in essentially four main ways: as soil moisture, when the insects are in the ground; as a mechanical factor that impinges directly on them when they are exposed; through its effects on foodplants; and through its effects on natural enemies of the pests. Though any one pest species may be influenced by two o r more of these processes and in different ways by each depending on the stage of its life cycle that is affected, usually only one way is significant. Precipitation is so far of little value in forecasting pest situations reliably, but water in various forms has much potential for use as a pest control agent.

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Association of Subzero Temperatures, Snow Cover, and Winter Mortality of Grasshopper Eggs in Saskatchewan

Cited by 11 publications

References 15 publications

LIFE HISTORY PARAMETERS IN MELANOPLUS SANGUINIPES (F.) IN TWO CRESTED WHEATGRASS PASTURES

LIFE HISTORY PARAMETERS IN MELANOPLUS SANGUINIPES (F.) IN TWO CRESTED WHEATGRASS PASTURES

Genetic variation in prairie populations of Melanoplus sanguinipes, the migratory grasshopper

Effects of Precipitation on Crop Insects

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