TY - JOUR
T1 - Patterns of egg mass deposition of platynota idaeusalis (Lepidoptera
T2 - Tortricidae) within an apple orchard
AU - Knight, Alan L.
AU - Hull, Larry A.
AU - Rajotte, Edwin G.
N1 - Funding Information:
We thank our summer student assistants and support staff for their help in collecting the data. We also thank Jim Brigman, Norm Suhr, and Henry Wong for their valuable assistance in preparing and analyzing the rubidium samples. We appreciate the helpful comments of Shelby Fleischer and Jane Hayes on an earlier draft. This project was funded with financial support from the Northeastern Regional Integrated App]e Pest Management Project (NE-156), and the State Horticultural Association of Pennsylvania. This paper was authorized 5 May 1989, as journal series paper 8190 of the Pennsylvania Agricultural Experiment Station.
Publisher Copyright:
© 1990 Entomological Society of America.
PY - 1990/12/1
Y1 - 1990/12/1
N2 - 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).
AB - 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).
UR - http://www.scopus.com/inward/record.url?scp=0004765316&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0004765316&partnerID=8YFLogxK
U2 - 10.1093/ee/19.3.648
DO - 10.1093/ee/19.3.648
M3 - Article
AN - SCOPUS:0004765316
VL - 19
SP - 648
EP - 655
JO - Environmental Entomology
JF - Environmental Entomology
SN - 0046-225X
IS - 6
ER -