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Home → Publications → Tree Planters' Notes → Tree Planters' Notes Volume 41, Number 4 (1990) → Insecticides Effectively Control an Aphid Pest of White Fir Seedlings

Insecticides Effectively Control an Aphid Pest of White Fir Seedlings

Severe damage from a fir aphid (Mindarus victoria Essig) was first reported for white fir (Abies concolor (Gord. & Glend.) Lindl.) bareroot nursery seedlings at Placerville, CA, in 1987. One and two applications of acephate, chloropyrifos, diazinon, dimethoate, or fluvalinate were tested for control of this fir aphid on white fir seedlings in 1988. One application of one of these insecticides significantly reduced aphid infestations for at least 73 days; two applications significantly reduced aphid populations throughout the growing season. All insecticide treatments significantly reduced the occurrence of dead apical buds on seedlings ready to be harvested for outplanting. Two applications of acephate produced side effects that significantly reduced the height and increased diameter growth of white fir seedlings.


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Author(s): John D. Stein, Michael I. Haverty

Publication: Tree Planters' Notes - Volume 41, Number 4 (1990)

Volume: 41

Number: 4