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Proceedings of Past Forest Nursery Association Meetings:

Effective Control of a New Woolly White Fir Nursery Aphid (Homoptera: Aphididae)
John D. Stein and Canine R. Trummer
1992: Fallen Leaf Lake, CA
Damage by a woolly fir aphid (Mindarus
sp. nr. victoria Essig [Homoptera: Aphididae]) was first
reported in white fir (Abies concolor [Gord. & Glend.]
Lindl.) nursery beds at Placerville, California, in 1987.
The 47% cull rate attributed to this aphid resulted in a to-
tal loss of $204,000 (nursery plus site preparation cost). To
reduce aphid damage to nursery seedlings, 11 different in-
secticide formulations were tested for aphid control during
1988 and 1989. One application of acephate, chlorpyrifos,
diazinon, dimethoate, esfenvalerate, cyfluthrin and fluval-
inate in the Spring significantly reduced aphid infestations
until midsummer. Two applications of acephate, chlor-
pyrifos, diazinon, dimethoate, and fluvalinate were effect-
tive in reducing aphid populations throughout the growing
season. Carbaryl, azadirachtin, and soap were apparently
not effective against this aphid in the nursery environment.
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