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Day‐degree models for predicting the generation time and flight activity of local populations of Lobesia botrana (Den. & Schiff.) (Lep., Tortricidae) in Greece

The generation time of Lobesia botrana (Den. & Schiff.) was estimated as the number of day‐degrees required between the start of a flight and the start of the following flight in two regions in northern Greece. The day‐degrees required for the first generation (x=339.3, Naoussa; x=275.6, Thessaloniki) were significantly shorter than for the second (x=751.5, Naoussa; x=833.8, Thessaloniki) and the third generations (x=899.5, Naoussa; x=1197.0, Thessaloniki). Nonlinear models were developed using trap catches of male L. botrana during 1987–1989 for predicting its flight activity. A lower threshold temperature of 6.45°C was used in calculating daily day‐degrees from 1 March. The models predicted with sufficient accuracy the accumulated male moth catch and they accounted for the 60–78% and 86–91% of year‐to‐year variation in male flight activity in Thessaloniki and Naoussa, respectively.