Objective  A high-yield, high-starch, wide-adaptability cassava cultivar was bred in Guangxi province for fresh consumption or further processing.

  Method   A newly bred F1 progeny of crossing between the high-yield, low-starch Xinxuan 048 as female parent and the high-yield, high-starch, 1ow-hydrocyanic acid Guire 891 as male parent was generated by artificial pollination and induction. After seedling selection and a series of primary, intermediate, and advanced tests as well as regional and production trials, Guire No. 11 (GR11) was selected.

  Result  As shown in the production trial, GR11 delivered an average tuber yield of 39.68 t·hm⁻², which was 28.38% and 52.03% higher than SC No. 205 and SC No. 9, respectively. The tubers had a starch content of 32.4%, which was 3.7% higher than SC No. 205 and same as SC No. 9; a dry matters content of 40.7%, which was 4.7% higher than SC No. 205; an HCN content of 22.2 mg·kg⁻¹ (based on FW); a rich content of nutrients (based on FW), such as 0.75 g·hg⁻¹ on protein, 1.5 g·hg⁻¹ on total sugar, 1.0% on crude fiber, 37.2 mg·hg⁻¹ on vitamin C, and 123 μg·hg⁻¹ on carotene. The new cultivar received the tropical crop variety certification on November 3, 2020.

  Conclusion  The high and stable yield GR11 with wide adaptability was resistant to drought, cold, and mites, and its leaves did not fall off easily. It could be adequately cultivated in current cassava-producing areas in Guangxi, Hainan, and Jiangxi provinces for either fresh consumption, further processing, or as a raw material for manufacturing starch products.