Emergence of overwintered larvae of eye-spotted bud moth, <i>Spilonota ocellana</i> (Lepidoptera: Tortricidae) in relation to temperature and apple tree phenology at Summerland, British Columbia
Keywords:
Spilonota ocellana, Tortricidae, larval development, phenology, degree daysAbstract
We recorded daily appearance of overwintered larvae of eye-spotted bud moth (ESBM), Spilonota ocellana (Denis & Schiffermüller) in spring 1992, 1994, and 1996 in an unsprayed apple orchard at Summerland, British Columbia, to relate larval emergence to degree-day (DD) accumulation and apple phenology. In all years the first larva was found between mid-March and early April, and none appeared after late April. Median emergence of larvae occurred when McIntosh apple trees were at early, tight-cluster stage of fruit-bud development. Larval head capsule measurements showed that ESBM usually overwinter as fifth and sixth instars, with a small proportion (≤6%) as fourth instar larvae. In the laboratory we monitored emergence of non-diapausing overwintered larvae from apple branches incubated at 8.8, 9.4, 12.9, 15.0, 18.0, and 20.9ºC. A least-squares linear regression described emergence over this temperature range relatively accurately (r2 = 0.57, P < 0.05) and a base temperature for emergence (Tb = 1.0ºC ± 0.6) was extrapolated from this regression. Regression analysis indicated median emergence should require 154.6 ± 6.7 DD above 1ºC (DD 1ºC). Using daily airtemperature maxima and minima and 1 March to start accumulating DD1ºC, the error between predicted and observed days to median emergence in the field was -6.7 ± 3.1 d; the regression model predicted early in every case. Using observed larval appearance on apples (1992, 1994, & 1996) and an iterative process, we determined that a combination of 6ºC as the Tb and 1 January as a date to start accumulating DD6ºC, minimized the coefficient of variation for the three-year mean DD 6ºC accumulations (82.7 ± 3.5 DD 6ºC) required for 50% of the larvae to appear in the field. While this latter DD index described observed emergence of larvae accurately, and its use may help improve management of ESBM, it should be validated using independent data before growers use it routinely.References
Allen, J.C. 1976. A modified sine wave method for calculating degree days. Environmental Entomology 5: 388-396.
Arnold, C.Y. 1959. The determination and significance of the base temperature in a heat unit system. Proceedings of American Horticultural Science 74: 430-445.
British Columbia Ministry of Agriculture, Fisheries and Food. 1996. Tree fruit production guide for commercial growers: interior districts. British Columbia Ministry of Agriculture, Fisheries and Food, Victoria, B.C.
British Columbia Ministry of Agriculture, Fisheries and Food. 2004. Tree fruit production guide for commercial growers: interior districts. British Columbia Ministry of Agriculture, Fisheries and Food, Victoria, B.C.
Brunner, J.F. 1991. Leafroller pests of fruit crops in Washington State, pp. 185-197. In K. Williams (ed.), New directions in tree fruit pest management. Good Fruit Grower, Yakima. WA.
Campbell, A., B.D. Fraser, N. Gilbert, A.P. Gutierrez, and M. Mackauer. 1974. Temperature requirements of some aphids and their parasites. Journal of Applied Ecology 11: 431-438.
Danks, H.V. 1987. Insect dormancy: an ecological perspective. Biological Survey and Canadian Monograph Series 1. The Entomological Society of Canada, Ottawa, Ontario.
Deventer, van P., A.K. Minks, L.H.M. Blommers, U. Neumann, and K. Jilderda. 1992. Mating disruption utilizing lepidopterous sex pheromones: Three years testing in apple orchards in The Netherlands. Proceedings of the Brighton Crop Protection Conference — Pests and Diseases 3: 1193-1198.
Dyck, V.A. and M.G.T. Gardiner. 1992. Sterile-insect release program to control the codling moth Cydia pomonella (L.) (Lepidoptera: Olethreutidae) in British Columbia, Canada. Acta Phytopathologica et Entomologica Hungarica 27: 219-222.
Gillespie, D.R. 1985. Impact of feeding by Lepidoptera larvae on the production of highbush blueberry in the lower Fraser Valley, British Columbia. The Canadian Entomologist 117: 949-953.
Gilliatt, F.C. 1932. Four years’ observations on the eye-spotted bud moth, Spilonota ocellana D. and S., in Nova Scotia. Scientific Agriculture 12: 357-371.
Higley, L.G., L.P. Pedigo, and K.R. Ostlie. 1986. DEGDAY: a program for calculating degree-days, and assumptions behind the degree-day approach. Environmental Entomology 15: 999-1016.
Judd, G.J.R. and M.G.T. Gardiner. 2004. Simultaneous disruption of pheromone communication and mating in Cydia pomonella, Choristoneura rosaceana and Pandemis limitata (Lepidoptera: Tortricidae) using Isomate-CM/LR in apple orchards. Journal of the Entomological Society of British Columbia 101: 3-14.
Judd, G.J.R., M.G.T. Gardiner, and D.R. Thomson. 1993. Temperature dependent development and prediction of hatch in overwintered eggs of the fruittree leafroller, Archips argyrospilus (Walker)(Lepidoptera: Tortricidae). The Canadian Entomologist 125: 945-956.
Judd, G.J.R., M.G.T. Gardiner, and D.R. Thomson. 1996. Commercial trials of pheromone-mediated mating disruption with Isomate-C® to control codling moth in British Columbia apple and pear orchards. Journal of the Entomological Society of British Columbia 93: 23-34.
Judd, G.J.R., J.E. Cossentine, M.G.T Gardiner, and D.R. Thomson. 1994. Temperature-dependent development of the speckled green fruitworm, Orthosia hibisci Guenée (Lepidoptera: Noctuidae). The Canadian Entomologist 126: 1263-1275.
Leroux, J. and C. Reimer. 1959. Variation between samples of immature stages, and of mortalities from some factors, of the eye-spotted bud moth, Spilonota ocellana (D. and S.) (Lepidoptera: Olethreutidae), and the pistol casebearer, Coleophora serratella (L.) (Lepidoptera: Coleophoridae), on apple in Quebec. The Canadian Entomologist 61: 428-449.
MacLellan, C.R. 1978. Trends of eye-spotted bud moth (Lepidoptera: Olethreutidae) populations over 12 years on two cultivars in an insecticide free orchard. The Canadian Entomologist 110: 91-100.
Madsen, H.F. and A.D. Borden. 1949. The eye-spotted bud moth on prune in California. Journal of Economic Entomology 42: 915-920.
Madsen, H.F. and R.S. Downing. 1968. Integrated control of the fruit-tree leaf roller, Archips argyrospilus(Walker) and the eye-spotted bud moth, Spilonota ocellana (Denis and Schiffermüller). Journal of the Entomological Society of British Columbia 65: 19-21.
McBrien, H.L. and G.J.R. Judd. 1998. Forecasting emergence, flight, and oviposition of Spilonota ocellana(Lepidoptera: Tortricidae) in British Columbia. Environmental Entomology 27:1411-1417.
Oatman, E.R., E.F. Legner, and R.F. Brooks. 1962. Bionomics of the eye spotted bud moth, Spilonota ocellana, on cherry in Wisconsin. Journal of Economic Entomology 55: 930-934.
Tauber, M.T. and C.A. Tauber. 1976. Insect seasonality: diapause maintenance, termination, and postdiapause development. Annual Review of Entomology 21: 81-107.
Weires, R. and H. Riedl. 1991. Other tortricids on pome and stone fruits, North American species, pp. 413-434. In L.P.S. van der Geest and H.H. Evenhuis (eds.), Tortricid Pests, Their Biology, Natural Enemies, and Control. Elsevier, New York.
Zar, J.H. 1984. Biostatistical Analysis, Second Edition. Prentice-Hall, Englewood Cliffs, New Jersey.
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