| The objective of this study is to define the occurrence, distribution biological characteristics of weedy rice in Guangdong province, and to provide basic information on the prevention of weedy rice in Guangdong Province.The occurrence and hazard situation of weedy rice with cultivated rice in Guangdong province was investigated through visual scoring of the level of weed infestation on a seven-class scale. The biological characteristics, incidence, density and harmfulness of weedy rice in rice fields was analysis. The proportion of weedy rice occurrence ranged from 0.00% to 33.11% in Guangdong province. The weedy rice seriously infested the paddy field in Leizhou, Huidong, Fengkai and Enping by 18.10, 2.52, 1.60, 0.96 plant/m2, separately, and the value of weedy rice was 56%, 45.00%, 29.20%, 15.80%.The weedy rice was taller than cultivated rice, the weedy rice produced more tillers than cultivated rice at seedling stage,the leaf color was lighting, the weedy rice was earlier matured compared with cultivated rice, the weedy rice seed shattering was easier than cultivated rice, the testa of weedy rice was red, the weedy rice was more like Indica Rice. The distribution for the occurrence of weedy rice in Guangdong province was southwestern rice planting area> mid-southern rice planting area> mid-northern rice planting area> northern rice planting area, and the incidence of weedy rice is direct rice field >throwing field> transplanting field. |
