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  • 1
    Electronic Resource
    Electronic Resource
    Impact of Bacillus thuringiensis – insecticides on population dynamics and egg predation of the Colorado potato beetle in North Carolina potato plantings (1998)
    Springer
    BioControl 43 (1998), S. 65-75 
    Details
    ISSN: 1573-8248
    Keywords: Bacillus thuringiensis var. tenebrionis ; biological control ; Coleoptera ; Chrysomelidae ; Coccinellidae ; Leptinotarsa decemlineata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Field studies to assess the impact of Bacillus thuringiensis var. tenebrionis (Btt)-insecticides on Colorado potato beetle populations, egg survivorship and levels of predation on egg masses were conducted in replicated field research plots during two years. Stage-specific abundance of the Colorado potato beetle and predation on egg masses were monitored in Btt-treated and untreated potato plots in both years. The Btt-treatments significantly reduced densities of large (third and fourth instar) Colorado potato beetle larvae. The densities of large larvae remained below 0.5 and 3 per plant in the Btt-treatment while peak densities of 4.5 and 21 large larvae per plant occurred in the untreated control in 1992 and 1993, respectively. Regular sampling of egg masses indicated that predation rates in Btt-treated and untreated plots did not differ significantly although, in 1993, predation rates of up to 100% were recorded, only in Btt-treated plots. In a predator exclusion study carried out in 1992, survivorship of protected eggs was consistently higher than of eggs exposed to predation. Seasonal survivorship of exposed eggs was significantly lower in the Btt-treated than in untreated plots. Btt insecticides for control of Colorado potato beetles provided direct protection of the crop and were compatible with naturally-occurring biological control of Colorado potato beetle eggs due to predation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009966404802
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  • 2
    Electronic Resource
    Electronic Resource
    Potential impact of Coleomegilla maculata predation on adaptation of Leptinotarsa decemlineata to Bt-transgenic potatoes (1997)
    Springer
    Entomologia experimentalis et applicata 82 (1997), S. 91-100 
    Details
    ISSN: 1570-7458
    Keywords: Bacillus thuringiensis ; Leptinotarsa ; Coleomegilla ; potato ; resistance ; Coleoptera ; Coccinellidae ; Chrysomelidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The relationship between Leptinotarsa decemlineata Say egg density and Coleomegilla maculata DeGeer predatory behavior was investigated at different spatial scales (plant-to-plant and plot-to-plot). Both adult C. maculata location and daily egg consumption rates were monitored over time in greenhouse and field tests. Despite aggregation in areas of highest prey density by C. maculata, egg consumption was inversely related to egg mass density at the smallest and the largest spatial scales tested. The experimental data on predation rates in high and low density field treatments were included in a mathematical model to simulate impact of natural enemies on the rate of L. decemlineata adaptation to Bt-toxin-expressing transgenic potato plants when Bt-expressing plants are mixed at the plot-to-plot level with normal potato plants. Results showed that C. maculata predatory behavior could decrease the rate at which L. decemlineata adapted to Bt-toxins if plot-to-plot mixed-plantings were used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002935706990
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  • 3
    Electronic Resource
    Electronic Resource
    Role of steroidal glycoalkaloid α-tomatine in host-plant resistance of tomato to colorado potato beetle (1991)
    Springer
    Journal of chemical ecology 17 (1991), S. 989-1005 
    Details
    ISSN: 1573-1561
    Keywords: Host-plant resistance ; host-plant selection ; glycoalkaioids ; Leptinotarsa decemlineata ; Coleoptera ; Chrysomelidae ; Lycopersicon ; α-tomatine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The role of the steroidal glycoalkaloid α-tomatine in the hostplant resistance of tomato to the Colorado potato beetle,Leptinotarsa decemlineata (Say) was examined in short- (24 hr; using first- and fourth-instar larvae) and long-term (first-instar larvae reared through the prepupal stage) feeding experiments. Consumption rate, growth rate, efficiency of conversion of ingested food to body mass, and survival were compared forL. decemlineata provided foliage from susceptible (Lycopersicon esculetum Mill. cv. Walter), resistant (L. hirsutum f.Glabratum C.H. Mull accession PI 134417), and F1 hybrid plants. Values obtained for dietetic indices were regressed against corresponding values for α-tomatine content of foliage provided to larvae. Differences in dietetic indices could not be attributed to variation in foliar α-tomatine content despite a long-standing literature showing theex planta α-tomatine inhibits feeding and growth byL. decemlineata.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01395604
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of multilure and its components on parasites ofScolytus multistriatus (Coleoptera: Scolytidae) (1984)
    Springer
    Journal of chemical ecology 10 (1984), S. 373-385 
    Details
    ISSN: 1573-1561
    Keywords: Aggregation pheromone ; Scolytus multistriatus ; Coleoptera ; Scolytidae ; Cheiropachus colon ; Entedon leucogramma ; Spathius benefactor ; Dendrosoter proluberans ; Cerocephala eccoptogastri ; Hymenoptera ; Pteromalidae ; Braconidae ; Eulophidae ; European elm bark beetle ; parasites ; kairomone ; multilure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Several hymenopterous parasites ofScolytus multistriatus are attracted to components of its aggregation pheromone, multilure.Cheiropachus colon, Entedon leucogramma, Dendrosoter protuberans, Spathius benefactor, andCerocephala eccoptogastri are attracted in various degrees to multilure, its components (multistriatin, 4-methyl-3-heptanol, and cubebene), and component combinations.C. colon was trapped in greatest numbers, yet was usually less numerous thanE. leucogramma andD. protuberans in the study area. Impact of traps onC. colon may conceivably be reduced by multistriatin content in baits and/or by withholding traps untilS. multistriatus flight begins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987864
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