The use of the Lamb daily weather types and the indices of progressiveness, southerliness and cyclonicity to investigate the autumn migration of Rhopalosiphum padi.
Abstract
The numbers of Rhopalosiphum padi sampled using UK 12.2 m suction traps during the autumn were related to weather data from the preceding year using multiple regression and correspondence analysis. The multiple regression approach using data from Ayr, Scotland, in 1976-89 resulted in models that produced good predictions in 10 of the 14 years when tested with data from Belfast, Northern Ireland. The correspondence analysis (TWINSPAN) approach using data from 1971-90, which grouped years with similar autumn samples of R. padi at 6 UK suction trap sites, showed associations with temperature in the preceding winter and rainfall in the preceding summer. This was achieved using the Lamb daily weather types and the indices of progressiveness, southerliness and cyclonicity.