Effective Control of a New Woolly White Fir Nursery Aphid (Homoptera: Aphididae)


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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Publication Forest Nursery Proceedings
Event Fallen Leaf Lake, CA - 1992
Author John D. Stein and Canine R. Trummer
Published 1992/09/14
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