title: Seasonal phenology of Ferrisia gilli (Hemiptera: Pseudococcidae) in commercial pistachios.
abstract: The mealybug Ferrisia gilli Gullan is a serious new pest of pistachios in California. It was first found near the town of Tulare in the late 1990s and has since spread to orchards in most pistachio-producing regions of the state. The seasonal phenology of F. gilli was evaluated in a commercial pistachio orchard in Tulare County during 2005 and 2006. During both seasons E gilli overwintered as small nymphs and had three complete generations per year. Mealybug population densities were low and remained as immatures in March and April; by late May adult females formed and averaged (+/- SE) 1.3 +/- 0.3 and 1.2 +/- 0.3 per 0.75 m of sample branch in 2005 and 2006, respectively. The first in-season generation occurred from early June through mid-July, with mealybug densities ranging from 17.6 +/- 5.6-26.4 +/- 6.2 mealybugs per 0.75 m sample branch. The second in-season generation occurred from late July through September and had peak densities of 408.6 +/- 93.9 and 182.0 +/- 34.2 mealybugs per branch. In March and April mealybugs were located primarily on the buds and branch wood; in May the population was on branch wood as well as the rachis; from June through September the population was located primarily in the pistachio cluster. F. gilli's seasonal phenology described herein was used to develop a management program.
authors.affiliation: University of California Cooperative Extension, Kern County, 1031 South Mount Vernon, Bakersfield, CA 93307, USA. dhaviland@ucdavis.edu
authors.forename: David R
authors.initials: DR
authors.lastname: Haviland
authors.forename: Robert H
authors.initials: RH
authors.lastname: Beede
authors.forename: Kent M
authors.initials: KM
authors.lastname: Daane
mesh_terms: D000818:Animals; D002140:California; D005260:Female; D006430:Hemiptera / Q000502:physiology*; D008297:Male; D009758:Nymph / Q000502:physiology; D027927:Pistacia; D011157:Population Dynamics; D012621:Seasons