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Collaborative project: Rapeseed cultivation with mixcropping systems for repelling insects and reducing insecticides - subproject A (Raps-OP)
Project
Project code: 281C308A19
Contract period: 01.07.2021
- 31.12.2024
Budget: 312,841 Euro
Purpose of research: Applied research
Keywords: seed and planting material, crop protection, plant health, biological plant protection, bees, rape seed, crop production, biological diversity
The long-term treatment index (BI) for insecticides in oilseed rape was 2.75 between 2011 and 2017 and is therefore relatively high (PAPA JKI 2019). Nevertheless, yields and acreage are decreasing in Germany (UFOP 2018). In addition to the physiological bud wilt and insufficient rainfall, insects are an important influencing factor (ISIP 2019). Increasing resistance and the limited choice of insecticides exacerbate the problem. An innovative solution would be to grow plants in a mixture or next to the rapeseed that are more attractive for rapeseed pests than the rapeseed itself, so-called "catch crops" for "diversionary feeding" of various rapeseed pests. This could be, for example, an admixture of turnips or earlier flowering rapeseed. Stripes on the edge or in the tramline, e.g. from marrow trunk cabbage, would also be conceivable. The pests could then be concentrated and tolerated in a targeted manner on such "attraction strips" or controlled mechanically or chemically ("attract and kill"). By not using insecticides, natural predators could also have a greater effect. Another option would be to undersow white clover, which could make it more difficult for insect pests to find the oilseed rape. At the same time, the added plants lengthen the flowering period and increase the flowering aspect, which, together with a significant reduction in the use of insecticides, should have a positive effect on biodiversity and insect diversity. The addition of flowering plants represents valuable sources of pollen and nectar for honey bees, wild bees and pollinators. Habitat can also be created for beneficial insects, which colonize the cultivated plant stocks from there and exterminate pests. The additional sowing of catch plants in tramlines means that nectar and pollen can be available to the pollinator insects even before the main bloom.
Section overview
Subjects
- Beekeeping and health
