Patterns of egg mass deposition of platynota idaeusalis (Lepidoptera: Tortricidae) within an apple orchard

Alan L. Knight, Larry A. Hull, Edwin G. Rajotte

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Two field releases of rubidium (Rb)-labeled, laboratory-reared adult Platynota idaeusalis (Walker) were conducted to measure female adult dispersal and egg mass deposition patterns within a 33-ha (about 7,450 trees) apple orchard in Adams County, Pa. In both studies >3,200 virgin male and female adults (♂:♀ ratio = 1.1:1.0) were reared from rubidium-incorporated diet (3 g Rb/liter) and released on four center trees. Trees were randomly sampled for hatched and unhatched egg masses up to 500 m from the release sites. Atomic absorption spectrophotometry was used to detect rubidium in egg masses, and masses were considered marked if concentrations were > 10 ppb. Following the first release, 417 trees were sampled and 39% of the 222 egg masses collected were marked. Following the second release, 260 trees were sampled and 67% of the 346 egg masses collected were marked. The distribution of rubidium-labeled egg masses demonstrated that spatial patterns of egg mass deposition are primarily local and are affected by ambient air temperatures. For example, 90% of all recovered rubidium-labeled egg masses were found within 65 and 45 m of the release sites, and the most distant labeled egg mass was found at 250 and 170 m, respectively, following adult releases during a warm period in July (daily minimum temperatures, > 16°C) and a cooler period in September (daily minimum temperatures, <12°C).

Original languageEnglish (US)
Pages (from-to)648-655
Number of pages8
JournalEnvironmental entomology
Issue number6
StatePublished - Dec 1 1990

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Insect Science


Dive into the research topics of 'Patterns of egg mass deposition of platynota idaeusalis (Lepidoptera: Tortricidae) within an apple orchard'. Together they form a unique fingerprint.

Cite this