Based on our degree-day model for Sparganothis fruitworm, flight initiation is expected at around 596 DD (see chart). As of June 06, Sparganothis has accumulated 706 DD (using March 1 as biofix; based on Wisconsin conditions) or 554 DD (using April 15 as biofix; a more realistic biofix based on the time when winter flood is removed from New Jersey beds). This indicates that flight activity has likely just started or will start in the next few days. Growers are advised to place pheromone traps for monitoring this pest as soon as possible if they haven’t done so already.
Degree-day model for Sparganothis fruitworm
