Biological Control of the Spruce Coneworm Dioryatria abietella: Spraying with Bacillus thuringiensis Reduced Damage in a Seed Orchard

Author: Weslien, Jan

Source: Scandinavian Journal of Forest Research, Volume 14, Number 2, 1 May 1999 , pp. 127-130(4)

Publisher: Taylor and Francis Ltd

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Spraying of cones with Bacillus thuringiensis var. Kurstaki × Aizawa in a Norway spruce (Picea abies (L.) Karst.) seed orchard reduced damage by Dioryctria abietella Den. et Schiff. (Lepidoptera, Pyralidae). The incidence of D. abietella attacks was about 80% among unsprayed cones, but less than 15% showed attacks among cones that had been sprayed three times at 9-day intervals with a 0.2% suspension (weight/weight) of the B. thuringiensis preparation in water (Turex 50 WP, 25000 IU/mg). Attacked, sprayed cones had fewer D. abietella larvae per cone than attacked, unsprayed cones. Spraying did not reduce the damage by Cydia strobilella (L.) (Lepidoptera, Tortricidae) or by Strobilomyia anthracina Czerny (Diptera, Anthomyiidae).

Document Type: Regular Paper


Publication date: May 1, 1999

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