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EFFICACY OF ESFENVALERATE FOR CONTROL OF INSECTS HARMFUL TO SEED PRODUCTION IN DISEASE-RESISTANT WESTERN WHITE PINES

Published online by Cambridge University Press:  31 May 2012

N.G. Rappaport ,
M.I. Haverty ,
P.J. Shea  and
R.E. Sandquist
N.G. Rappaport
Affiliation:
USDA Forest Service, Pacific Southwest Research Station, PO Box 245, Berkeley, California, USA 94701
M.I. Haverty
Affiliation:
USDA Forest Service, Pacific Southwest Research Station, PO Box 245, Berkeley, California, USA 94701
P.J. Shea
Affiliation:
USDA Forest Service, Pacific Southwest Research Station, PO Box 245, Berkeley, California, USA 94701
R.E. Sandquist
Affiliation:
USDA Forest Service, Pacific Northwest Region, Forest Pest Management, PO Box 3623, Portland, Oregon, USA 97208
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Abstract

We tested the pyrethroid insecticide esfenvalerate in single, double, and triple applications for control of insects affecting seed production of blister rust-resistant western white pine, Pinus monticola Douglas. All treatments increased the proportion of normal seed produced and reduced the proportion of seed damaged by the western conifer seed bug, Leptoglossus occidentalis Heidemann. Only the triple application reduced the proportion of cones killed by the pine cone beetle, Conophthorus ponderosae Hopkins. Other seed-damaging insect species [seed chalcids, Megastigmus sp.; the fir coneworm, Dioryctria abietivorella (Grote); and seedworms, Cydia sp.] were present but in numbers too low to test for insecticide efficacy.

Résumé

On a constaté l’efficace de l’esfenvalérate avec des traitements simples, doubles, et triples contre les insectes nuisibles des cônes et graines de Pinus monticola Douglas amélioré de résistance contre la rouille. Tous les traitements ont augmenté la proportion des graines saines et tous les trois ont réduit la proportion de graines endommagées par la punaise à pattes feuilleuses, Leptoglossus occidentalis Heidemann. Uniquement le traitement triple a réduit la proportion des cônes tuée par le scolyte des cônes du pin, Conophthorus ponderosae Hopkins. Les autres espèces d’insectes nuisibles présentes à ce verger à graines [chalcidiens, Megastigmus sp.; la pyrale des cônes du sapin, Dioryctria abietivorella (Grote); et la pyrale des graines, Cydia sp.] ont été présentes aux niveaux trop bas d’essayer l’efficace de l’insecticide.

Type
Articles
Information
The Canadian Entomologist , Volume 126 , Issue 1 , February 1994 , pp. 1 - 5
Copyright
Copyright © Entomological Society of Canada 1994

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