Willow Carrot Aphid Forecast 2026
The graph below shows the 鈥榙ay-degree forecast鈥� for willow-carrot aphid (Cavariella aegopodii). The forecast is based on accumulated day-degrees (D掳) from 1 February (base 4.4掳C). Information from the Rothamsted Suction trap captures have been used to estimate the mean number of D掳 from 1 February until the first aphid of the year is caught in a suction trap (the start of the migration to carrot) and when 10% of aphids are caught. This is after approximately 325 and 451D掳 respectively.
Graph updated to 12 July 2026 and projected forwards using weather records from the previous year.
Counts for 2026 for the network of suction traps are here.
