Evaluating the influence of landscape composition on almond orchard susceptibility to leaffooted bug (Leptoglossus zonatus, Hemiptera: Coreidae) colonization in the spring

Leaffooted bug (LFB) (Coreidae: Leptoglossus zonatus) is a key pest of almonds, pistachios, and pomegranates, as well as numerous vegetable crops. In nut crops, LFB feed on the immature nuts with their piercing sucking mouthparts, which damages the developing embryo and can lead to premature nut drop. LFB overwinter in aggregate clusters in sheltered locations, such as perennial vegetation or residential areas. In the Spring, LFB migrate into almond orchards and then later in the season move on to other crops like pistachios and pomegranates. The risk of LFB damage to almonds based on the composition of surrounding habitats is poorly understood. This study aims to evaluate the influence of landscape composition on LFB migration into almond orchards. To accomplish this, LFB were monitored weekly in April and May at twenty almond orchards throughout Central California. Data on LFB populations was then evaluated to determine the extent to which various landscape features can be used to predict the timing and abundance of LFB arrival into almond orchards. This information has the potential to help growers assess their risk of LFB colonization based on the composition of habitats surrounding their orchards.