# The status of the predatory mite Neoseiuluscalifornicus (McGregor) (Acari: Phytoseiidae) in the UK, and its potential as a biocontrol agent of Panonychus ulmi (Koch) (Acari: Tetranychidae)

Jolly, Rebecca Louise (2001). The status of the predatory mite Neoseiuluscalifornicus (McGregor) (Acari: Phytoseiidae) in the UK, and its potential as a biocontrol agent of Panonychus ulmi (Koch) (Acari: Tetranychidae). University of Birmingham. Ph.D.

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## Abstract

The non-native predatory phytoseiid mite $$Neoseiulus$$ $$californicus$$ has been found in recent years in UK apple orchards. The aims of this study were to determine whether this mite could establish in the UK and its potential as a biocontrol agent for $$Panonychus$$ $$ulmi$$.

By reviewing the literature and examining specimens of $$N. californicus.$$ it was concluded that taxonomic synonymies with $$Amblyseius$$ $$californicus.$$ $$Amblyseius$$ $$chilenensis$$ and $$Typhlodromus$$ $$mungeri$$ could be supported, but those with $$Typhlodromus$$ $$marinus$$ and $$Neoseiulus$$ $$fallacis$$ could not.

$$Neoseiulus$$ $$californicus$$ was found in strawberry, hop, blackcurrant and apple plantations in the main fruit growing regions of the UK. Field and laboratory studies showed that $$N.californicus$$ possesses the ability to diapause, is a chill tolerant species and can survive winter field conditions in the UK.

$$Neoseiulus$$ $$californicus$$ was found to readily consume both $$Panonychus$$ $$ulmi$$ and $$Tetranychus$$ $$urticae$$ and consumed greater numbers of prey than the native phytoseiid $$Typhlodromus$$ $$pyri$$. Deutonymphs consumed an average of 1.8 and 1.6 immature $$P. ulmi$$ stages per day respectively and an average of 2.6 and 1.4 $$T. urticae$$ respectively. The total mean development time for $$N. californicus$$ was 7.47 days and for $$T. pyri$$ was 12.45, feeding on $$P.ulmi$$.

$$Neoseiulus$$ $$californicus$$ from USA, Spain and UK displayed differences in measurements of a selection of morphological characteristics, diapause ability (16, 0 and 960/0 diapause respectively), development times (shortest for USA and longest for UK), fecundity (0.82-0.97 eggs per day) and esterase banding patterns, indicating the existence of different detectable strains.

In conclusion, $$N. californicus$$ was found to be a component of fruit plantation fauna in the UK, has the potential to survive winter field conditions and readily consumes $$P. ulmi$$ and $$T.urticae$$.

Type of Work: Thesis (Doctorates > Ph.D.)
Award Type: Doctorates > Ph.D.
Supervisor(s):
Supervisor(s)EmailORCID
Bale, Jeffrey SUNSPECIFIEDUNSPECIFIED
Licence:
College/Faculty: Schools (1998 to 2008) > School of Biosciences
School or Department: School of Biosciences
Funders: Other
Other Funders: East Malling Trust
Subjects: Q Science > QH Natural history > QH301 Biology
Q Science > QK Botany
URI: http://etheses.bham.ac.uk/id/eprint/5259

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