Spring insecticide treatments control adelgids on Douglas fir

Spring insecticide treatments control adelgids on Douglas fir

Insecticide applications made to Douglas fir Christmas trees vary in their ability to suppress Cooley spruce gall adeigid, a sucking insect that causes needle distortion and discoloration. A field experiment in Napa County showed that organophosphate systemics are ineffective at controlling adelgids...

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Bibliographic Details
Main Authors: Lucia Varela, Richard S. Cowles, Dean Donaldson
Format: Article
Language:English
Published: University of California Agriculture and Natural Resources 1996-09-01
Series:California Agriculture
Online Access:http://calag.ucanr.edu/archive/?article=ca.v050n05p34
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spelling doaj-9844b0418ef74ca18cd0f4009f170c572020-11-24T21:57:45ZengUniversity of California Agriculture and Natural ResourcesCalifornia Agriculture0008-08452160-80911996-09-01505343710.3733/ca.v050n05p3410.3733/cav050n05_10Spring insecticide treatments control adelgids on Douglas firLucia Varela0Richard S. Cowles1Dean Donaldson2L.G. Varela is North Coast Integrated Pest Management Advisor, Sonoma County Cooperative Extension and Statewide IPM ProjectR.S. Cowles is former Assistant Entomologist, Department of Entomology, UC Riverside and current Assistant Entomologist, Connecticut Agricultural Experiment Station, Valley Laboratory, ConnecticutD.R. Donaldson is County Director, Napa County Cooperative ExtensionInsecticide applications made to Douglas fir Christmas trees vary in their ability to suppress Cooley spruce gall adeigid, a sucking insect that causes needle distortion and discoloration. A field experiment in Napa County showed that organophosphate systemics are ineffective at controlling adelgids, but imidacloprid, a newly registered systemic insecticide, is highly effective. Horticultural oil is effective, but causes slight needle yellowing. This side effect can be mitigated by precisely timing the oil application before bud break when the overwintering adelgids are transforming to adults but before they lay eggs.http://calag.ucanr.edu/archive/?article=ca.v050n05p34
collection DOAJ
language English
format Article
sources DOAJ
author Lucia Varela
Richard S. Cowles
Dean Donaldson
spellingShingle Lucia Varela
Richard S. Cowles
Dean Donaldson
Spring insecticide treatments control adelgids on Douglas fir
California Agriculture
author_facet Lucia Varela
Richard S. Cowles
Dean Donaldson
author_sort Lucia Varela
title Spring insecticide treatments control adelgids on Douglas fir
title_short Spring insecticide treatments control adelgids on Douglas fir
title_full Spring insecticide treatments control adelgids on Douglas fir
title_fullStr Spring insecticide treatments control adelgids on Douglas fir
title_full_unstemmed Spring insecticide treatments control adelgids on Douglas fir
title_sort spring insecticide treatments control adelgids on douglas fir
publisher University of California Agriculture and Natural Resources
series California Agriculture
issn 0008-0845
2160-8091
publishDate 1996-09-01
description Insecticide applications made to Douglas fir Christmas trees vary in their ability to suppress Cooley spruce gall adeigid, a sucking insect that causes needle distortion and discoloration. A field experiment in Napa County showed that organophosphate systemics are ineffective at controlling adelgids, but imidacloprid, a newly registered systemic insecticide, is highly effective. Horticultural oil is effective, but causes slight needle yellowing. This side effect can be mitigated by precisely timing the oil application before bud break when the overwintering adelgids are transforming to adults but before they lay eggs.
url http://calag.ucanr.edu/archive/?article=ca.v050n05p34
work_keys_str_mv AT luciavarela springinsecticidetreatmentscontroladelgidsondouglasfir
AT richardscowles springinsecticidetreatmentscontroladelgidsondouglasfir
AT deandonaldson springinsecticidetreatmentscontroladelgidsondouglasfir
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