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Full text of this article is only available in PDF format.

Erkki Annila (email), Kari Heliövaara

Chemical control of cone pests in a Norway spruce seed orchard.

Annila E., Heliövaara K. (1991). Chemical control of cone pests in a Norway spruce seed orchard. Silva Fennica vol. 25 no. 2 article id 5442. https://doi.org/10.14214/sf.a15596

Abstract

The effect of three pesticides containing either dimethoate (0.5% a.i.), permitrin (0.5%) or triadimephon (0.5%) on the cone pests and flowering biology of Norway spruce (Picea abies (L.) H. Karst.) was tested in a seed orchard in mid-May or in the beginning of June. The pesticide treatments significantly reduced infestation by Laspeyresia strobiella and Kaltenbachiella strobi only. Variation in the number of cones infested by both insects and cone rusts was high between the spruce clones. Generally, the pesticides did not affect flower viability, seed quality or seed germination, but reduced drastically the germination capacity of pollen in vitro. In practice, sufficient control cannot be achieved with concentrations or methods used in the present study.

The PDF includes an abstract in Finnish.

Keywords
Norway spruce; Picea abies; seed orchards; seed quality; pollen; chemical control; pesticides; cone pests; cone rust; pest control

Published in 1991

Views 8429

Available at https://doi.org/10.14214/sf.a15596 | Download PDF

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