Hostname: page-component-586b7cd67f-2plfb Total loading time: 0 Render date: 2024-11-27T19:22:47.042Z Has data issue: false hasContentIssue false
  • English
  • Français

The Relation of Thrips to Pansy Spot on Apples1

Published online by Cambridge University Press:  31 May 2012

Harold F. Madsen  and
Ian D. Jack
Harold F. Madsen
Affiliation:
Research Station, Summerland, British Columbia
Get access Rights & Permissions [Opens in a new window]

Abstract

Pansy spot, a discoloration of the skin of McIntosh and Spartan apples, was shown to be a reaction of the apples to the egg punctures of thrips. Periodic sampling of apple blossoms and native hosts associated with apple orchards showed that Frankliniella occidentalis (Pergande) was the dominant species. The adult thrips moved from host to host as each came into flower, and apples were but one of several hosts attacked during the early spring.

The thrips were most numerous in apple blossoms during the bloom period, and oviposited in the flower parts. The adult thrips left the apples after the bloom period, and the nymphs that hatched from the eggs developed in the calyx end of the young fruit. When the nymphs matured they oviposited in the young apple before leaving for other hosts. The area of apple skin surrounding the thrips egg developed the typical pansy spot symptoms. Other apple varieties were also attacked, but did not develop pansy spots.

It was evident that the best time to apply control measures was at the petal fall period, when nymphal thrips were present but before damage was caused to the young apples.

Type
Articles
Information
The Canadian Entomologist , Volume 98 , Issue 9 , September 1966 , pp. 903 - 908
Copyright
Copyright © Entomological Society of Canada 1966

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Beirne, B. P. 1955. Collecting, preparing and preserving insects. Can. Dep. Agric. Publ. 932, 133 pp.Google Scholar
Boyce, H. R. 1955. Notes on injury to tree fruits by Frankliniella tritici (Fitch) (Thysanoptera: Thripidae). Canad. Ent. 87: 238–239.CrossRefGoogle Scholar
Marshall, J. 1953. Unpublished Report, Ent. Lab., Summerland, B.C.Google Scholar
Marshall, J. 1961. Unpublished Report, Ent. Lab., Summerland, B.C.Google Scholar
Newcomer, E. J. 1921. A thrips injury to apple. Better Fruit 16: 10.Google Scholar
Peterson, A. 1937. A manual of entomological equipment and methods. Edwards Bros. Inc., Part 1, 21 pp., 138 plates.Google Scholar
Sharma, P. L., and Bhalla, O. P.. 1963. Occurrence of the thrips damaging apple blossoms in Himachal Prodesh. Indian J. Ent. 25: 85–86.Google Scholar
Swift, J. E., and Madsen, H. F.. 1956. Thrips damage to apple. J. econ. Ent. 49: 398–399.CrossRefGoogle Scholar
Venables, E. P. 1925. Pansy spots on apple (a peculiar form of thrips injury). Proc. ent. Soc. B.C. 22: 9–12.Google Scholar