Predation, reproduction, and impact of phytoseiid mites (Acari: Phytoseiidae) on cyclamen mite (Acari: Tarsonemidae) on strawberry.

  • Croft B. A
  • Pratt P. D
  • Koskela G
 et al. 
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Abilities of phytoseiid mites to attack, reproduce, and control Phytonemus
pallidus on strawberry were assessed. In laboratory feeding tests,
Typhlodromus pyri, Neoseiulus fallacis [Amblyseius fallacis] and
N. californicus attacked P. pallidus most often; Amblyseius andersoni
fed on the cyclamen mite most successfully, and Galendromus occidentalis
[Metaseiulus occidentalis] had difficulty piercing the hardened body
of adults. Net predation was T. pyri > N. fallacis > N. californicus
> A. andersoni > G. occidentalis. Although several species fed on
P. pallidus, some are more common on strawberry or are more proven
as effective predators of P. pallidus and thus later reproduction
and pest control tests were conducted with only 2 species. When held
with excess cyclamen mites, survival and immature production of N.
fallacis were approx equal to 50% of when feeding on a more preferred
prey, Tetranychus urticae and like levels for N. cucumeris, a proven
effective predator of P. pallidus. When releases of N. fallacis or
N. cucumeris were made to plants with moderate densities of cyclamen
mites and T. urticae, pests were controlled sooner and damage to
plants was less with N. fallacis than N. cucumeris. Releases of both
phytoseiids to plants infested with high densities of only cyclamen
mites produced fewer of either N. fallacis or N. cucumeris than when
both pests were present, but there was better pest control (less
plant damage) and again, N. fallacis gave slightly better control
than N. cucumeris. Although N. fallacis gave more rapid control of
both pests, N. cucumeris may give longer- term regulation at lower
densities. Differences in life histories may dictate that unique
methods of release are needed for N. fallacis versus N. cucumeris
and mixed releases of both may be effective.

Author-supplied keywords

  • strawberries biological control feeding life histo

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  • a Croft B.

  • D Pratt P.

  • G Koskela

  • D Kaufman

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