Evaluation of new formulations of imidacloprid/tebuconazole and metalxyl M/ thiamethoxam mixtures for the control of cotton seedling pests and diseases
2007
Ahmed, N.E., Agricultural Research Corporation, Gezira Research Station, Wad Medani (Sudan) | Abdal-Gadir, H., Agricultural Research Corporation, Gezira Research Station, Wad Medani (Sudan) | Adam, S.M., Agricultural Research Corporation, Gezira Research Station, Wad Medani (Sudan) | Adam, Y.S., Agricultural Research Corporation, Gezira Research Station, Wad Medani (Sudan) | Amani, F., Agricultural Research Corporation, Gezira Research Station, Wad Medani (Sudan)
The efficacy of newly introduced mixtures of metalaxyl M and thiamethoxam (Apron star 42% WS and Apron XL 350 FS/Cruiser 350 FS) and new formulations of an already recommended mixture of tebuconazole (Raxil 2% WS) and the insecticide imidacloprid (Gaucho 70% WS); namely Tebicon 2% WS/Catch 70% WS, Tebizol 2% WS /Goulish70% WP, Tebucal 2% WS /Licol 70% WS and Raxil 2% WS/Imidoc70% WS were evaluated against the pre- and post- emergence damping- off diseases, bacterial blight and flea beetles in the commercial cotton cultivars, Barac (67) B and Barakat 90. In both cultivars, all tested rates and mixtures of Apron star and Apron XL/Cruiser considerably reduced damping- off diseases. Apron Star at 5 and 6 g/kg seeds resulted in significant reduction of bacterial blight disease compared to the untreated control in both varieties and seasons. In field experiments, Apron Star and Apron XL/Cruiser gave erratic control of flea beetles in both varieties and seasons and they were consistently less efficient than the standard treatment in controlling the pest. Under laboratory conditions, in season 2005/06 Apron Star and Apron XL/ cruiser at all rates gave significantly lower flea beetles' damage than the untreated control. However, in season 2006/07 Apron Star at all rates significantly reduced the number of shot holes, while Apron XL gave significantly higher flea beetles' damage compared to the untreated control. All new formulations of imidacloprid/tebuconazole resulted in comparable disease and flea beetles control to that of the counterpart and significantly better results than the untreated control. All treatments resulted in comparable seed cotton yield to that of the standard treatment and the counterpart. However, the seed cotton yield was increased by all mixtures compared to the untreated control. The yields obtained by the Metalaxyl M/Cruiser mixtures were lower than that of the standard treatment. The yield of Barakat 90 was increased by 19-41% and 8-48% over the untreated control by imidacloprid/tebuconazole and Metalaxyl M/thiomethoxam mixtures, respectively. The yield increase in Barac (67) B was 17-30% and 8-42%, respectively
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