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Light trap catches of fruit tortricid moths in kent england uk 1964 1974 and associated temperature sums



Light trap catches of fruit tortricid moths in kent england uk 1964 1974 and associated temperature sums



Plant Pathology 27(4): 169-182



Light-trap catches of 5 tortricid species were recorded at orchard sites [apple, pear and plum] in Kent over an 11 yr period. Dates on which moths of Hedya nubiferana (Haw.), Cydia pomonella (L.) and Archips podana (Scop.) were caught in light traps were strongly correlated with accumulated temperatures in day-degrees above a base of 8.degree. C. Correlation was less for catches of Pandemis heparana (Denis and Schiff.) and slightly better for those of C. pomonella above 10.degree. C than above 8.degree. C. Data were insufficient to calculate temperature sums for catches of Adoxophyes orana (Fisch. v. Roesl.). Moth catches of all 5 spp. showed differences between years in the timing of 1st and 2nd generations. The dates of 1st catches are compared with dates estimated from the following temperature sums: for H. nubiferana 226 day-degrees above 8.degree. C, for C. pomonella 268 day-degrees above 8.degree. C and 149 day-degrees above 10.degree. C, for A. podana 326 day-degrees above 8.degree. C and for P. heparana 386 day-degrees above 8.degree. C. In the 11-yr period, estimated dates of 1st catch were within .+-. 5 days of 1st actual catch of moths in light traps in 9 yr for C. pomonella, 8 yr for H. nubiferana and A. podana, but only 3 yr for P. heparana.

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