Six chemicals with animal repellent or insecticide properties are screened for phytotoxic effects on the germination and viability of ash, birch, Corsican pine and sycamore seeds
Source: Forestry, Volume 77, Number 5, 2004 , pp. 397-403(7)
Publisher: Oxford University Press
Abstract:As a prelude to direct sowing experiments, a laboratory study was carried out to determine whether six chemicals with insect and/or rodent repellent properties (Aaprotect, Capsaicin, Guardsman, Hallmark, Scuttle, Treeguard) affected the germination capacities and/or viability percentages of European ash (Fraxinus excelsior L.), silver birch (Betula pendula L.), Corsican pine (Pinus nigra ssp. laricio L.) and sycamore (Acer pseudoplatanus L.) seeds. None of the chemical repellents had a significant effect on either the germination capacity or viability of ash or birch seeds. One repellent (Guardsman) significantly reduced the germination capacity of sycamore from 49 to 32 per cent (P 0.01). Two repellents (Aaprotect and Scuttle) significantly reduced the germination capacity of Corsican pine from 74 to 62 per cent (P 0.05) and 11 per cent (P 0.001), respectively. Corsican pine was therefore the most sensitive of the species investigated to phytotoxic effects. Viability percentages (at the end of germination tests on repellent-treated seeds) showed that virtually all ungerminated seeds were dead. Greater phytotoxicity was observed for small-seeded species when they were incubated on a substrate of moist filter paper than when they were sown in moist peat + sand. One explanation is that the larger volume of peat + sand in the seed-tray allowed the chemicals to leach away from the seeds more quickly. Alternatively, perhaps the peat inactivated the chemicals through adsorption. The results are used to exclude certain chemical and tree seed combinations from future seed predation studies associated with direct sowing.
Document Type: Research Article
Publication date: 2004
- Forestry publishes refereed papers on all aspects of research, practice and policy that promote the sustainable development of forests, woodlands and trees. In considering suitability for publication attention is given to both the originality of contributions and their practical application. Preference is usually given to work undertaken in the temperate and/or boreal zones; only articles of exceptional merit from tropical zones will also be considered.