The influence of relative humidity on egg hatch in Euseius finlandicus, Typhlodromus pyri and Kampimodromus aberrans (Acari, Phytoseiidae)

Author(s)
P Schausberger
Abstract

The effects of different relative humidities (50%, 55%, 65%, 75%, 85% and 100% RH) on egg hatch were tested at 25 +/- 1 degrees C for three strains of Euseius finlandicus Oudemans, two strains of Typhlodromus pyri Scheuten and two strains of Kampimodromus aberrans Oudemans. At decreasing humidity, egg mortality increased earlier in K. aberrans than in E, finlandicus and T. pyri. E. finlandicus and T. pyri had similar humidity responses. Differences between strains within each species were small. RH50 values (relative humidity at which 50% of eggs hatch) were 50.4%, 52.4% and 53.1% for strains of E. finlandicus, 51.8% and 53.3% for strains of T. pyri, and 55.3% and 57.5% for strains of K. aberrans, respectively. Eggs of the Finnish E. finlandicus strain were most drought resistant (50.4% RH50), eggs of the French K. aberrans strain were most sensitive (57.5% RH,,). The results are discussed in relation to the abundance of these species on certain plants and to the humidity responses of other phytoseiids.

Organisation(s)
External organisation(s)
Fed Off & Res Ctr Agr, Inst Phytomed
Journal
Journal of Applied Entomology
Volume
122
Pages
497-500
No. of pages
4
ISSN
0931-2048
Publication date
12-1998
Peer reviewed
Yes
Austrian Fields of Science 2012
106047 Animal ecology, 106048 Animal physiology
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/the-influence-of-relative-humidity-on-egg-hatch-in-euseius-finlandicus-typhlodromus-pyri-and-kampimodromus-aberrans-acari-phytoseiidae(9d9fbea6-5ae8-497b-a004-f5ea82faf2d1).html