Factors affecting the presence of Typhlodromus spp. (Acarina

Phytoseiidae) in the calyx cavities of apple fruits and implications for integrated pest management

G. M. Gurr, W. G. Thwaite, B. J. Valentine, H. I. Nicol

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Predatory mites of the family Phytoseiidae include several species of importance as biological control agents of phytophagous mites in various crops including apples. We report on the postharvest presence of the motiles of two species, Typhlodromus occidentalis and Typhlodromus pyri, in the calyx cavities of apple fruits of three cultivars. The mean numbers of motiles per fruit were as high as 6.10. The phytoseiid densities were lowest in cv. Bonza and tended to be greater in samples taken in late autumn, particularly in cv. Red Delicious. No significant effect (p > 0.05) was observed for different insecticide treatments. Phytoseiids remained present within fruits of cv. Granny Smith left on the orchard floor in winter. Together with an observed reduction in the numbers of T. occidentalis in the early spring, this suggests that fruits constitute an overwintering refuge. The findings are discussed in relation to the implications for biological control, in particular the minimization of the removal of natural enemies from orchards.

Original languageEnglish
Pages (from-to)357-364
Number of pages8
JournalExperimental and Applied Acarology
Volume21
Issue number6-7
Publication statusPublished - 1997

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Typhlodromus
integrated pest management
Phytoseiidae
calyx
Acari
cavity
fruit
apples
Metaseiulus occidentalis
fruits
orchard
mite
biological control
orchards
Typhlodromus pyri
phytophagous mites
predatory mites
overwintering
natural enemy
natural enemies

Cite this

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title = "Factors affecting the presence of Typhlodromus spp. (Acarina: Phytoseiidae) in the calyx cavities of apple fruits and implications for integrated pest management",
abstract = "Predatory mites of the family Phytoseiidae include several species of importance as biological control agents of phytophagous mites in various crops including apples. We report on the postharvest presence of the motiles of two species, Typhlodromus occidentalis and Typhlodromus pyri, in the calyx cavities of apple fruits of three cultivars. The mean numbers of motiles per fruit were as high as 6.10. The phytoseiid densities were lowest in cv. Bonza and tended to be greater in samples taken in late autumn, particularly in cv. Red Delicious. No significant effect (p > 0.05) was observed for different insecticide treatments. Phytoseiids remained present within fruits of cv. Granny Smith left on the orchard floor in winter. Together with an observed reduction in the numbers of T. occidentalis in the early spring, this suggests that fruits constitute an overwintering refuge. The findings are discussed in relation to the implications for biological control, in particular the minimization of the removal of natural enemies from orchards.",
keywords = "Apples, Overwintering, Phytoseiid mites, Typhlodromus occidentalis, Typhlodromus pyri",
author = "Gurr, {G. M.} and Thwaite, {W. G.} and Valentine, {B. J.} and Nicol, {H. I.}",
year = "1997",
language = "English",
volume = "21",
pages = "357--364",
journal = "Experimental and Applied Acarology",
issn = "0168-8162",
publisher = "Springer Netherlands",
number = "6-7",

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TY - JOUR

T1 - Factors affecting the presence of Typhlodromus spp. (Acarina

T2 - Phytoseiidae) in the calyx cavities of apple fruits and implications for integrated pest management

AU - Gurr, G. M.

AU - Thwaite, W. G.

AU - Valentine, B. J.

AU - Nicol, H. I.

PY - 1997

Y1 - 1997

N2 - Predatory mites of the family Phytoseiidae include several species of importance as biological control agents of phytophagous mites in various crops including apples. We report on the postharvest presence of the motiles of two species, Typhlodromus occidentalis and Typhlodromus pyri, in the calyx cavities of apple fruits of three cultivars. The mean numbers of motiles per fruit were as high as 6.10. The phytoseiid densities were lowest in cv. Bonza and tended to be greater in samples taken in late autumn, particularly in cv. Red Delicious. No significant effect (p > 0.05) was observed for different insecticide treatments. Phytoseiids remained present within fruits of cv. Granny Smith left on the orchard floor in winter. Together with an observed reduction in the numbers of T. occidentalis in the early spring, this suggests that fruits constitute an overwintering refuge. The findings are discussed in relation to the implications for biological control, in particular the minimization of the removal of natural enemies from orchards.

AB - Predatory mites of the family Phytoseiidae include several species of importance as biological control agents of phytophagous mites in various crops including apples. We report on the postharvest presence of the motiles of two species, Typhlodromus occidentalis and Typhlodromus pyri, in the calyx cavities of apple fruits of three cultivars. The mean numbers of motiles per fruit were as high as 6.10. The phytoseiid densities were lowest in cv. Bonza and tended to be greater in samples taken in late autumn, particularly in cv. Red Delicious. No significant effect (p > 0.05) was observed for different insecticide treatments. Phytoseiids remained present within fruits of cv. Granny Smith left on the orchard floor in winter. Together with an observed reduction in the numbers of T. occidentalis in the early spring, this suggests that fruits constitute an overwintering refuge. The findings are discussed in relation to the implications for biological control, in particular the minimization of the removal of natural enemies from orchards.

KW - Apples

KW - Overwintering

KW - Phytoseiid mites

KW - Typhlodromus occidentalis

KW - Typhlodromus pyri

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