Valid Names Results

Ferrisia gilli Gullan, 2003 (Pseudococcidae: Ferrisia)

Nomenclatural History

• Ferrisia gilli Gullan 2003: 728. Type data: USA: California, Tulare County, Avenue 196, on pistachio [-Pistacia vera]; 5/9/2002, by S.A. Steffan. Holotype, female, male, and first instar, by original designation Type depository: Davis: The Bohart Museum of Entomology, University of California, California, USA; accepted valid name Illustr.

Common Names

• Gill's mealybug KaydanGu2012
• Gill’s striped mealybug PachecKaKo2022
• Cochinilla rayada de Gill PachecKaKo2022

Ecological Associates

Hosts:

Families: 16 | Genera: 19

Foes:

Families: 1 | Genera: 1

Associates:

Families: 2 | Genera: 2

Geographic Distribution

Keys

• KaydanGu2012: pp.11-12 ( Adult (F) ) [Key to species of Ferrisia based on adult females]

Remarks

• Systematics: Kaydan & Gullen, 2012, felt that the status of F. gilli as a species distinct from F. quaintancii required confirmation even though the adult females differ substantially in morphology. For example, the adult female of F. gilli is distinguished readily from that of F. quaintancii by the presence of more than 90 enlarged tubular ducts on the dorsum, compared with 0-2 ducts on F. quaintancii. However seven samples (six from California and one from Alabama) of F. gilli that were sequenced for the study of Gullan et al. (2010) formed a group with a single immature specimen of putative F. quaintancii (from the roots of Rhus copallina in Florida) in all data partitions and analyses.
• Structure: Ferrisia gilli can be diagnosed by having the following combination of features: absence of anterior ostioles; ventral oral-collar tubular ducts of more than one size; clusters of small oral-collar tubular ducts on ventral margins of at least the posterior abdominal segments, sometimes on all body segments; ventral oral-collar tubular ducts generally associated with 1 or 2 minute discoidal pores around duct rim (never touching rim), each pore 2.5-3.5 ìm in diameter; dorsal enlarged tubular ducts totalling 90–144 on dorsum, with 1 or 2 oval discoidal pores usually associated with rim of each duct opening; number of multilocular disc pores on venter of abdominal segments as follows: 5-20 on segment VII, and 6-23 on segment VIII + IX; anterior pair of ostioles absent, posterior pairs well developed. (Kaydan & Gullan, 2012)
• Biology: Infestations of F. gilli are a problem in orchards and vineyards in California. (Kaydan & Gullan, 2012) It developed annually at least three synchronous generations in San Joaquin Valley, California, USA (Gullan et al, 2003). Mercer, et al. (2023) found that the first generation was synchronous, but occurred 3 weeks earlier than previously reported and subsequent generations are now smeared. Increased yearly temperatures are a likely explanation for the changes observed in phenology. Infestations of F. gilli are a problem in orchards and vineyards in California. (Kaydan & Gullan, 2012)
• Economic Importance: Symptoms are not a reliable indicator of the presence or absence of GLRaV-3. Interveinal discoloration and curly leaves can be caused by factors that are not related to infection by GLRaV-3 such as nutrient deficiencies, environment, and other diseases. Conversely, asymptomatic vines may also be infected by GLRaV-3. The choice and timing of applications of insecticide is critical for mealybug control, and systemic insecticides applied in-season (early summer) as a foliar application showed promising results on mealybugs control. (Jones & Nita, 2016)
• General Remarks: Description and illustration of adult femal, third instar female, first and second instar nymph by Gullan et al. (2003). Molecular diagnosis of this species by Gullan et al. (2003).

Illustrations

Citations