Spatial distribution and coincidence of Neoseiulus californicus and Tetranychus urticae (Acari: Phytoseiidae, Tetranychidae) on strawberry
Tóm tắt
In strawberry greenhouses in La Plata (Buenos Aires, Argentina), Tetranychus urticae is a major pest and Neoseiulus californicus is its most important established phytoseiid predator. The purpose of this study was to determine the spatial distribution and coincidence of N. californicus and T. urticae on strawberry. T. urticae populations exhibited density variations that were followed, with some temporal delay, by those of the predator. In general terms, N. californicus exhibited lower aggregation than T. urticae. The index of dispersion (I) of T. urticae had values significantly greater than 1 in 100% of the sampling dates. The percentage of infested leaflets increased with prey density in a curvilinear way, ranging from 80 to 100% when density was higher than 100 individuals/leaflet. N. californicus had values of I higher than unity in 86.7% (G1) and 53.8% (G2) of the cases. TaylorÕs b and IwaoÕs β values were greater than 1 for both populations, this indicating aggregation. IwaoÕs results showed larger aggregation units of T. urticae (α=53.24) than of N. californicus (α=3.61), probably due to its higher fecundity and oviposition behaviour of laying eggs in clumps. Both populations were overdispersed, although in general terms, N. californicus exhibited lower aggregation than T. urticae. This would create refuges for the prey, thus increasing the persistence of the system. Index of coincidence of predator (Ic) was high most of the time even at low densities of both populations, decreased abruptly at the end of an interaction cycle and was similar at greenhouse and plant spatial scales. The high spatial coincidence of N. californicus with T. urticae suggests an important dispersal capacity of the predator and a high ability to detect leaflets with prey. The refuge index for the prey decreased with predator density and was higher at greenhouse scale than at plant scale, both at similar predator densities. At greenhouse scale and despite high predator density, the prey had a 10%-refuge, which would lead to the system persistence. Results of the present study suggest that N. californicus is a promising established natural enemy for controlling T. urticae on strawberry.
Tài liệu tham khảo
Bernstein, C. 1984. Prey and predator emigration responses in the acarina system Tetranychus urticae-Phytoseiulus persimilis. Oecologia 61: 134–142.
Bliss, C.I. and Fisher, R.A. 1953. Fitting the negative binomial distribution to biological data and note on the efficient fitting of the negative binomial. Biometrics 9: 176–200.
Chesson P.L. and Murdoch, W.W. 1986. Aggregation of risk: relationships among host-parasitoid models. Am. Natural. 127: 696–715.
Cross, J.V. 1984. Biological control of two-spotted spider mite (Tetranychus urticae) by Phytoseiulus persimilis on strawberries grown in ‘walk in’ plastic tunnels, and a simplified method of spider mite population assessment. Plant Pathology 33: 417–423.
DeBach, P. and Rosen, D. 1991. Biological Control by Natural Enemies. Cambridge University Press, Cambridge.
García Mari, F., González Zamora, J.E., Orenga Royo, S., Saques Fernández, J., Laborda Cenjor, R., Soto Sánchez, A. and Ribes Koninckx, A. 1991. Distribución espacial y asociación entre especies de ácaros fitófagos (Tetranychidae) y depredadores (Phytoseiidae) en hojas de fresón. Bol. San. Veg. Plagas 17: 401–415.
González Zamora, J.E., Orenga, S., García Mari, F. and Laborda, R. 1991. Liberación de ácaros depredadores para el control de la araña roja en fresón. Phytoma 32: 20–27.
Griffiths, K.J. 1969. The importance of coincidence in the functional responses of two parasites of the european pine sawfly, Neodiprion sertifer. Can. Ent. 101: 673–713.
Huffaker, C.B. 1958. Experimental studies on predation: dispersion factors and predation-prey oscillations. Hilgardia 27: 343–383.
Huffaker, C.B. and Kennett, C.E. 1956. Experimental studies on predation: predation and cyclamen mite populations on strawberries in California. Hilgardia 26:191–222.
Huffaker, C.B., Shea, K.P. and German, S.G. 1963. Experimental studies on predation: complex dispersion and levels of food in an acarine predator-prey interaction. Hilgardia 34: 305–330.
Iwao, S. 1968. A new regression method for analysing the aggregation pattern of animal populations. Res. Popul. Ecol. 10: 1–20.
Jones, V.P. 1990. Developing sampling plans for spider mites (Acari: Tetranychidae): those who don't remember the past may have to repeat it. J. Econ. Entomol. 83: 1656–1664.
Lloyd, M. 1967. Mean crowding. J. Anim. Ecol. 36: 1–30.
Luckinbill, L.S. 1973. Coexistence in laboratory populations of Paramecium aurelia and its predator Didinium nasutum. Ecology 54(6): 1321–1327.
McMurtry, J.A. and Croft, B.A. 1997. Life styles of phytoseiid mites and their roles in biological control. Annu. Rev. Entomol. 42: 291–321.
Monetti, L.N. and Fernández, N.A. 1995. Seasonal population dynamics of the european red mite (Panonychus ulmi) and its predator Neoseiulus californicus in a sprayed apple orchard in Argentina (Acari: Tetranychidae, Phytoseiidae). Acarologia 36: 325–331.
Nachman, G. 1981. Temporal and spatial dynamics of an acarine predator-prey system. J. Anim. Ecol. 50: 435–451.
Nachman, G. 1987. Systems analysis of acarine predator-prey interactions. II. The role of spatial processes in system stability. J. Anim. Ecol. 56: 267–281.
Nachman, G. 1991. An acarine predator-prey metapopulation system inhabiting greenhouse cucumbers. Biol. J. Linn. Soc. 42: 285–303.
Oatman E.R. and McMurtry, J.A. 1966. Biological control of the two-spotted spider mite on strawberry in Southern California. J. Econ. Entomol. 59(2): 433–439.
Oatman E.R., McMurtry, J.A. and Voth, V. 1968. Suppression of the two-spotted spider mite on strawberry with mass releases of Phytoseiulus persimilis. J. Econ. Entomol. 61(6): 1517–1521.
Oatman E.R., McMurtry, J.A., Gilstrap, F.E. and Voth, V. 1977. Effect of releases of Amblyseius californicus, Phytoseiulus persimilis and Typhlodromus occidentalis on the two spotted spider mite on strawberry in southern California. J. Econ. Entomol. 70:45–47.
Pickett, C.H. and Gilstrap, F.E. 1986. Inoculative releases of phytoseiids (Acari) for the biological control of spider mites (Acari: Tetranychidae) in corn. Environ. Entomol. 15: 790–794.
Poe, S.L. 1971. Influence of host plant physiology on populations of Tetranychus urticae (Acarina: Tetranychidae) infesting strawberry plants in peninsular Florida. Fla. Entomol. 54:183–186.
Pratt, P.D., Monetti, L.N. and Croft, B.A. 1998. Within-and between-plant dispersal and distribution of Neoseiulus californicus and N. fallacis (Acari: Phytoseiidae) in simulated bean and apple plant systems. Environ. Entomol. 27(1): 148–153.
Rasmy, H.A. and Ellaithy, A.Y.M. 1988. Introduction of Phytoseiulus persimilis for two spotted spider mite control in green houses in Egypt. (Acari: Phytoseiidae, Tetranychidae). Entomophaga 33(4): 435–438.
Raworth, D.A. 1986. Sampling statistics and a sampling scheme for the twospotted spider mite, Tetranychus urticae (Acari: Tetranychidae), on strawberries. Can. Entomol. 118(8): 807–814.
Sabelis, M.W. and Laane, W.E.M. 1986. Regional dynamics of spider-mite populations that become extinct locally because of food source depletion and predation by phytoseiid mites (Acarina: Tetranychidae, Phytoseiidae). Lect. Notes Biomath. 68: 346–376.
Sih, A. and Gleeson, S.K. 1995. A limits-oriented approach to evolutionary ecology. Trends Ecol. Evol. 10(9): 378–382.
So, P.-M. 1991. Distribution patterns of and sampling plans for Tetranychus urticae Koch (Acarina: Tetranychidae) on roses. Res. Popul. Ecol. 33: 229–243.
Sokal, R.R. and Rohlf, F.J. 1995. Biometry. W.H. Freeman, New York.
Southwood, T.R.E. 1978. Ecological Methods, 2nd edn. Chapman & Hall, London.
Strong, W.B. and Croft, B.A. 1995. Inoculative release of phytoseiid mites (Acarina: Phytoseiidae) into the rapidly expanding canopy of hops for control of Tetranychus urticae (Acarina: Tetranychidae). Environ. Entomol. 24(2): 446–453.
Strong, W.B., Croft, B.A. and Slone, D.H. 1997. Spatial aggregation and refuge of the mites Tetranychus urticae and Neoseiulus fallacis (Acari: Tetranychidae, Phytoseiidae) on hop. Environ. Entomol. 26(4): 859–865.
Taylor, L.R. 1961. Aggregation, variance and the mean. Nature 189: 732–735.
Trumble, J.T. 1985. Implications of changes in arthropod distribution following chemical application. Res. Popul. Ecol. 27: 277–285.
Walde, S.J. 1995. Internal dynamics and metapopulations: experimental tests with predator-prey systems. In: Population Dynamics, N. Cappuccino and P.W. Price (eds). Academic Press, San Diego, CA.