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Effect of forest fertilization on the spruce spider mite Oligonychus ununguis (Jacobi) (Acarina, Tetranychidae)

Loyttyniemi, K. and Heliovaara, K.

1991 - Volume: 32 Issue: 2 pages: 139-143


Oligonyghus ununguis Pigea abies nitrogen pest control Finland


Egg number of Oligonychus ununguis on Norway spruce (Picea abies) needles was investigated in a fertilization experiment in southern Finland. The highest number of winter eggs was recorded on the plots treated with a combination of nitrogen and phosphorus. According to needle nutrient analysis, the number of eggs was positively correlated with needle nitrogen concentrations, but not with those of phosphorus, potassium or calcium.

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1991 Loyttyniemi, K. and Heliovaara, K.
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