A Survey of Damage by Hylobius abietis and Hylastes spp. in Britain : Insects Affecting Reforestation. Biology and Damage

1989

S. 36-42

1 Abb., 5 Tab., 4 Lit. Ang.

Unselbständiges Werk

200069370

Details are given of the results of a survey of insect damage on young planting stock over more than 10 000 ha of recently restocked areas in Britain. In 6019 ha which had been planted with untreated stock, 54% of the plants were subsequently sprayed with Lindane during the first year after planting. Nineteen percent of these plants were killed by insect attack compared with only 3% of plants that had been dipped before planting. Hylastes was generally less damaging than Hylobius, but was found to be locally important. Spraying container-grown stock with insecticide before planting was less effective than dipping transplants with the same concentration. The treatment of plants by spraying after planting does not give an acceptable level of protection. The total cost of Hylobius and Hylastes damage and protection in British state forests planted during the 1985-86 season is estimated at over 0.5 million Pfund.