Sampling program for grape mealybugs improves pest management

The results of a mealybug study in Central Valley vineyards, designed to develop sampling guidelines, reveal that mealybug distribution on vines varies greatly through the season and that mealybugs usually prefer concealed locations, such as under bark. This combination makes sampling difficult. A n...

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Bibliographic Details
Published in:California agriculture (Berkeley, Calif.) Calif.), 2001-05, Vol.55 (3), p.19-27
Main Authors: GEIGER, Chris A, DAANE, Kent M, BENTLEY, Walter J, YOKOTA, Glenn Y, MARTIN, Lee A
Format: Article
Language:English
Subjects:
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
Phytopathology. Animal pests. Plant and forest protection
Protozoa. Invertebrates
Records, symptoms, damages, economic importance, population surveys
Vitis
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Summary:The results of a mealybug study in Central Valley vineyards, designed to develop sampling guidelines, reveal that mealybug distribution on vines varies greatly through the season and that mealybugs usually prefer concealed locations, such as under bark. This combination makes sampling difficult. A number of sampling techniques were compared. Three-or 5-minute timed counts were most efficient because samplers could follow the mealybugs' movement over the season. Midseason counts were much better predictors of damage at harvest than early season counts. This research confirms past control guidelines and opens new control options. Grape bunches touching vine trunks or spurs will have higher damage. Removing these bunches or using barriers between bunches and mealybug oviposition sites can also reduce damage.
ISSN:0008-0845
2160-8091
DOI:10.3733/ca.v055n03p19