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Green Lacewings and Water Sprays for Azalea Lace Bug Control1

Authors :
Barry Finley
J. Megan Woltz
Jana C. Lee
Jessica S. Wong
Katerina Velasco Graham
S. Michael Flores
Robin L. Rosetta
Source :
Journal of Environmental Horticulture. 36:119-125
Publication Year :
2018
Publisher :
Horticultural Research Institute, 2018.

Abstract

The azalea lace bug, Stephanitis pyrioides, is a serious pest of azaleas and rhododendrons which is often controlled by systemic insecticides. However, the efficacy of softer approaches such as biological control and water sprays against this pest on rhododendrons is unknown. Therefore, we tested the commercially available green lacewing predator, Chrysoperla rufilabris, and water sprays on lace bug infestation in one laboratory and four field trials. First, 2nd instar predator larvae were confirmed to consume lace bug nymphs and sometimes adults. Second, tapping predator larvae from hexcel units over dry leaves of potted rhododendrons and shaking loose eggs over wet leaves were reliable application methods. Third, predator larvae released onto potted rhododendrons lowered lace bug counts for two weeks. Fourth, after four bi-weekly applications, plants receiving egg cards or water-sprays had reduced lace bug counts and fewer damaged leaves than control plants. Fifth, landscape plants receiving the sequential combination of water spray followed by predator egg releases had 44 to 90% lower lace bug abundance and fewer damaged leaves than the control. After lace bugs were initially dislodged, hatching predators might have consumed hatching lace bugs. Index words: biological control, Chrysoperla rufilabris (Burmeister), mechanical control, rhododendron, Stephanitis pyrioides (Scott) Species used in this study: Azalea lace bug (Stephanitis pyrioides Scott), green lacewing (Chrysoperla rufilabris Burmeister), Rhododendron (Rhododendron spp.)

Details

ISSN :
25735586 and 07382898
Volume :
36
Database :
OpenAIRE
Journal :
Journal of Environmental Horticulture
Accession number :
edsair.doi...........653c28e935a829d00449b13ef9aab7a6
Full Text :
https://doi.org/10.24266/0738-2898-36.4.119