Life table characteristics of Macrolophus caliginosus preying upon Tetranychus urticae |
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Authors: | Dorthe L Hansen Henrik F Brødsgaard and Annie Enkegaard |
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Institution: | (1) Department of Population Ecology, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen, Denmark;(2) Department of Crop Protection, Research Centre Flakkebjerg, Danish Institute of Agricultural Sciences, DK-4200 Slagelse, Denmark |
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Abstract: | The life table characteristics of the polyphagous mirid Macrolophus caliginosus Wagner (Heteroptera: Miridae) preying on various stages of Tetranychus urticae Koch (Acari: Tetranychidae) with tomato as host plant were described at 22 °C. The following average parameters were obtained: Female longevity: 28.7 days; fecundity: 0.7 eggs/female/day; egg mortality: 2.6%; pre-oviposition period: 5.5 days; oviposition period: 18.1 days; post-oviposition period: 3.2 days; juvenile development time: 26.8 days; juvenile mortality: 34.9%; and sex ratio (/(+): 0.46. Life table parameters were estimated as net reproduction rate (R
0): 6.15; intrinsic rate of increase (r
m): 0.031 day–1; finite rate of increase (): 1.032; mean generation time (T
c): 58.17 days; and doubling time (T
2) 22.2 days. The parameters obtained were in accordance with those reported for M. caliginosus fed on another mite species (T. turkestani Ugarov & Nikolski (Acari: Tetranychidae)). However, compared to the performance of M. caliginosus fed on common glasshouse insect pests, a diet consisting of only mites appeared to be inferior. However, being a voracious predator, M. caliginosus may be a valuable addition to existing methods of mite control. |
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Keywords: | Macrolophus caliginosus mirid bug life table longevity fecundity development time mortality sex ratio oviposition period intrinsic rate of increase spider mite Tetranychus urticae tomato biological control glasshouse pests |
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