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Kari Löyttyniemi

Havupunkin, Oligonychus ununguis (Jacobi), aiheuttaman neulasvioituksen vaikutuksesta kuusen taimien kasvuun.

Löyttyniemi K. (1971). Havupunkin, Oligonychus ununguis (Jacobi), aiheuttaman neulasvioituksen vaikutuksesta kuusen taimien kasvuun. Silva Fennica vol. 5 no. 1 article id 4835. https://doi.org/10.14214/sf.a14624

English title: Influence of damage caused to needles of Norway spruce by spruce spider mite, Oligonychus ununguis, on seedling growth.

Abstract

The study was carried out in order to establish the possible influence of damage caused to the needles of Picea abies (L.) H. Karst. by the spruce spider mite, Oligonychus ununguis (Jacobi), and the growth of the damaged seedlings. The study was carried out in 1968–1970 by comparing growth of seedlings infected with spruce spider mite with that of seedlings where mites had been killed with acaricide (Eradex®). In the seedlings that had not been treated with acaricide, the number of wintering eggs were 60, 20 and 5 per shoot in the various years of the study. When the experiment was laid out, before planting and acaricide treatment, the seedlings were four years old, all seadlings were heavily infected, the number of wintering eggs being 100 per shoot. The growth of infected seedlings was 3, 20 and 15% smaller than that obtained for the seedlings which had been treated with acaricide.

The PDF includes a summary in English.

Original keywords
havupunkki; kuusi; neulasvauriot; taimituhot; pituuskasvu

English keywords
Norway spruce; Picea abies; spruce spider mite; Oligonychus ununguis; height growth; needle damages

Published in 1971

Available at https://doi.org/10.14214/sf.a14624 | Download PDF

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