Agnieszka Jasinska
Forsker
(+47) 911 43 013
agnieszka.jasinska@nibio.no
Sted
Ås - Bygg H7
Besøksadresse
Høgskoleveien 7, 1433 Ås
Sammendrag
Weed management in the apple orchard is crucial to maintain a high fruit yield and quality. Glyphosate applied twice is the usual strategy in apple orchards in Norway. Due to a recurring debate about the future of glyphosate use and a target in the Farm to Fork strategy of a 50% reduction in pesticide use by 2030, alternative solutions are needed. Two field trials conducted in 2023 in orchards (two- and eleven-year-old trees) are presented here. Six alternative strategies were tested: 1) hot water at 3 L m-2 x 3 (spring, early summer, summer), 2) hot water at 6 L m-2 x 3 (times as previous), 3) pelargonic acid at full dose (10.9 kg a.s. ha-1) x 2 (early summer, summer), 4) pelargonic acid at half dose (5.44 kg a.s. ha-1) x 2 (spring, summer), 5) acetic acid 10% at 25 kg a.s. ha-1 x 2 (early summer, summer) and 6) rotary hoe x 3 (spring, early summer, summer). Glyphosate at 1.08 kg a.s. ha-1 x 2 (early summer, summer) was included as a reference strategy. Hot water (±80 C, 0.1 bar) was applied with a commercial machine (Heatweed Technologies, Norway). For mechanical treatment “Orizzonti Mira” rotary hoe was used. Dry biomass and visual assessments of a percentage of ground covered by living vegetation were used to estimate weed control efficacy. Dominating species were Epilobium sp., Taraxacum officinale, Rumex longifolius in both fields, Aegopodium podagraria and Senecio vulgaris in the two-year-old field and Geranium sp. in the eleven-year-old field. Visual assessed in mid-July, i.e. about 3 weeks after the last application of the treatments, 3 hot water strategies with 6 L m-2 resulted in the highest level of weed control, i.e. 6 and 9% total weed cover in the eleven-year-old field and the two-year-old field, respectively. 3 L m-2 resulted in 16% and 20% total weed cover in the two-year-old field and the eleven-year-old field, respectively. This was better than the glyphosate strategy (23% and 55% total weed cover in eleven-year-old field and two-year-old field, respectively) and much better than pelargonic acid (both treatments), acetic acid 10% and rotary hoe strategy. The results of these trials showed very good efficacy of hot water, especially against annual weeds. No significant benefit of doubling hot water from 3 to 6 L ha L ha-1. Dry biomass was in the same order as visual assessments.
Sammendrag
I denne rapporten presenteres resultater fra biologisk veiledningsprøving av ugrasmidler mot ugras i potet på friland, i gulrot under plast og på friland og i pastinakk. I tillegg er VIPS-Ugras i vårkorn testet.
Sammendrag
Det er ikke registrert sammendrag