Articles
Understanding emergence phenology and developing monitoring tools for Pacific flatheaded borer in walnut orchards in California
Article number
1420_41
Pages
319 – 326
Language
English
Abstract
Flatheaded borer infestation (Coleoptera: Buprestidae) is a resurging problem of commercial walnuts, Juglans regia, in California’s Central Valley.
Reported as a problem of stressed weaker trees historically, the flatheaded borer problem has been increasingly reported in both young and mature, healthy walnut orchards for over five years.
Since limited information is available regarding the biology and monitoring of this borer pest, we conducted studies to understand the extent of the problem, determine pest phenology, and explore potential monitoring tools.
Our study showed that adult emergence occurs from May through July, with the peak activity in mid-June.
None of the traps and lures evaluated over three years attracted the flatheaded borer effectively.
In 2019, 79 adult Chrysobothris sp. were captured in different traps (purple funnel traps = 57, green sticky traps = 19, and purple sticky traps = 3). The majority of the Chrysobothris specimens we caught on the green prism traps were Chrysobothris mali. In contrast, purple funnel traps captured considerably higher numbers of C. wintu. The results of the study are discussed.
Reported as a problem of stressed weaker trees historically, the flatheaded borer problem has been increasingly reported in both young and mature, healthy walnut orchards for over five years.
Since limited information is available regarding the biology and monitoring of this borer pest, we conducted studies to understand the extent of the problem, determine pest phenology, and explore potential monitoring tools.
Our study showed that adult emergence occurs from May through July, with the peak activity in mid-June.
None of the traps and lures evaluated over three years attracted the flatheaded borer effectively.
In 2019, 79 adult Chrysobothris sp. were captured in different traps (purple funnel traps = 57, green sticky traps = 19, and purple sticky traps = 3). The majority of the Chrysobothris specimens we caught on the green prism traps were Chrysobothris mali. In contrast, purple funnel traps captured considerably higher numbers of C. wintu. The results of the study are discussed.
Publication
Authors
S. Gyawaly, J.P. Rijal
Keywords
flatheaded borer, Chrysobothris sp., walnut, trap monitoring
Groups involved
Online Articles (45)