United Kingdom field trials with Gaucho(R) for pest and virus control in sugar beet, 1989-1991
1992
Heatherington, P.J. (Bayer plc, Bury St. Edmunds, Sulffolk (United Kingdom). Crop Protection Business Group) | Meredith, R.H.
1. Imidacloprid (coded NTN 33893), a new nitroguanidine insecticide from Bayer AG, was tested in the United Kingdom as a seed pellet treatment for the control of pests and virus yellows in sugar beet. Field trials were carried out over the three year period from 1989 to 1991. 2. Imidacloprid was safe to the crop and in the absence of soil pests treated seed produced plant populations no different from untreated seed or standard treatments. 3. Imidacloprid at all rates gave high levels of control against a range of the most important foliar and soil arthropod pests. Control of the soil pests was equal to all standard materials used, and imidacloprid at 70 and 90 g a.i./100 000 seeds often achieved superior control of the leaf feeding pests Chaetocnema concinna, Pegomya hyoscyami and Atomaria linearis. 4. Imidacloprid gave excellent reductions in the main vector of virus yellows, Myzus persicae and this was generally reflected in disease control. Other aphid species Aphis fabae and Macrosiphum euphorbiae were also well controlled. Against aphids and virus yellows, 90 g a.i./100000 seeds was most effective. 5. Yield data was obtained from eight sites. Significant increases in yield from the use of imidacloprid were achieved at two sites with soil pests. There is also evidence that yield and sugar content are slightly increased through control of virus yellows by imidacloprid. 6. Long term field trials results with imidacloprid as a sugar beet seed treatment in the UK are extremely good. Environmental benefits from better targetting and less active ingredient are achieved and through its systemic properties, it can not only control soil pests but also foliar pests and infection by virus yellows
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