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以郑单958、辽单565和丹玉39为试材接种玉米纹枯病菌,对玉米纹枯病的流行动态进行系统调查,应用SPSS11.5软件将3年数据进行分析拟合。结果表明,与Logistic模型相比,脉冲Logistic模型可更直观、明确地反映年度间玉米纹枯病的周期性流行动态情况且符合该病发展的生物学意义;通过脉冲Logistic模型可以发现,年度间同一品种玉米纹枯病的最大病情指数(KN)和初始病情指数(dN)存在较大差异,表观侵染速率(rN)的差异较小;经Lo-gistic模型推导,明确沈阳地区玉米纹枯病指数增长期为玉米出苗至7月上旬,逻辑斯蒂增长期为7月上旬到8月末或9月初,衰退期为8月末或9月初到玉米生育后期。
Zhengdan 958, Liao Dang 565 and Dan 39 were inoculated with Rhizoctonia solani to systematically investigate the prevalence of sheath blight in maize. SPSS 11.5 software was used to analyze and fit the data of three years. The results showed that compared with Logistic model, the Logistic model can be more intuitive and clearly reflect the annual epidemic of corn sheath blight epidemiological situation and in line with the biological significance of the disease development; by Logistic Logistic model can be found in the year The maximum disease index (KN) and initial disease index (dN) of the same varieties of corn sheath blight showed a large difference, and the difference of apparent infection rate (rN) was small. Derived from the Lo-gistic model, The season of blight index increased from emergence of maize to early July, and the period of logistic increase was from early July to the end of August or early September. The decline period was late August or early September.