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杂交水稻虽然具有丰产性能好,抗病能力强等优点,但须指出的是,它和多数常规水稻一样,在长期单一化种植的情况下,也容易出现抗病性下降的问题,本文根据本地区杂交水稻汕优6号稻瘟病逐渐加重的事实,通过田间调查,对采集的病穗标样进行分离测定,以及对汕优6号原种及两亲本材料:不育系珍汕97A和恢复系国际26,进行一系列的接种试验,明确导致本地区汕优6号抗性下降,稻瘟病发生严重的原因,是由于中B和中C群小种上升所致,并有针对性地提出了防治策略。现将调查及试验结果汇总如下。
Although hybrid rice has the advantages of good yield performance and strong resistance to disease, it should be pointed out that, like most conventional rice, it is easy to have the problem of decreased disease resistance under the condition of long-term monoculture. Based on this Regional hybrid rice Shanyou 6 rice blast gradually aggravating the fact that field samples collected from the ear disease samples were isolated and measured, as well as Shanyou 6 elite and amphiploid materials: sterile line Zhenshan 97A and recovery Department of International 26, conducted a series of inoculation experiments, clearly led to the decline of resistance in Shanyou 6 in this region, the reason for the serious occurrence of blast is due to the increase in the B and C group races caused by increased and targeted put forward Prevention and control strategy. Now the survey and test results are summarized below.