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10-Minute Paper

Plant-Insect Ecosystems

P-IE: IPM - General

Evaluating the relationship between pistachio hull degradation and navel orangeworm egg deposition

Wednesday, November 8, 2023
8:48 AM – 9:00 AM ET
Location: Gaylord National Resort & Convention Center, Maryland C
In-Person
Infestation of pistachios by navel orangeworm (Amyelois transitella) (NOW) is contingent on the ability of this insect to access the kernel, which is protected by both the hull and shell of the nut. Over the course of the season, degradation of the hull and shell split provides access to NOW larvae. It is thought that NOW adult females can detect when such changes in the nut begin to take place, which subsequently triggers them to increase egg deposition on vulnerable nuts. While hull degradation and shell split generally take place later in the season as part of the pistachio developmental process, the timing and extent of these events can vary significantly from year‐to‐year. Growers currently have no way to predict the timing of this vulnerability and make management decisions accordingly. Here, we investigate changes in nut texture and volatile compounds over the course of hull degradation and shell split along with NOW egg deposition with the goal of identifying cues in the nuts used by NOW.