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Comparative analysis of leaf spot disease in Rice Belt of Punjab, Pakistan

机译：巴基斯坦旁遮普邦水稻带叶斑病的比较分析

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Background: Brown leaf spot (BLS) caused by Bipolaris oryzae (Breda de Haan) Shoemaker, is a chronic disease of rice that infects millions of hectares worldwide each year. In this study, a total of 18 rice growing districts of Punjab, Pakistan were surveyed during cropping season in 2014-17 for the incidence of BLS disease. Methods: The survey method was used to gather the data of BLS incidence during 2014-2017 in 18 districts of rice growing areas of Punjab, Pakistan. Meteorological data was collected from the weather stations of each surveyed district and co-related with BLS incidence. Results: The findings of the study revealed that quantitative relationship exists between meteorological variables and BLS incidence. The incidence of disease in the field was at peak during the month of October. The disease incidence varied from 1.12% to 14.37% over a period of study i.e. from 2014-2017. However, the role of relative humidity (RH) was highly positively correlated with the incidence of disease. Relative humidity showed a positive correlation with the incidence of disease as indicated by the year in which it was towards the high values. The highest disease incidence was observed in district Sargodha whereas the minimum in district Okara. The highest incidence of BLS disease was found in variety Basmati Super (51.43%) and the minimum in Basmati 386 (6.57%). Conclusion: Our study revealed that the fluctuations in temperature did not depict an appreciable impact on the incidence of BLS as indicated by the statistical coefficient, whereas RH strongly influenced the incidence of BLS incidence.
机译：背景：由双极米（Bpolara de Haan）制鞋商引起的褐斑病（BLS）是一种水稻的慢性病，​​每年感染全球数百万公顷。在这项研究中，在2014-17年度的种植季节期间，对巴基斯坦Punjab的18个水稻种植区进行了调查，调查了BLS病的发生率。方法：采用调查方法收集了巴基斯坦旁遮普邦18个水稻种植区2014- 2017年BLS发病率的数据。气象数据是从每个被调查地区的气象站收集的，并与BLS发生率相关。结果：研究结果表明，气象变量与BLS发生率之间存在定量关系。十月份该领域的疾病发病高峰。在一段时间内（从2014-2017年开始），该疾病的发病率从1.12％到14.37％不等。但是，相对湿度（RH）的作用与疾病的发病率高度正相关。相对湿度与疾病发生率呈正相关，正如该年份接近高值所表明的那样。在Sargodha地区观察到最高的疾病发生率，而在Okara地区观察到最低的发病率。 BLS疾病发生率最高的是巴斯马蒂超级品种（51.43％），最低的是巴斯马蒂386（6.57％）。结论：我们的研究表明，温度的波动对统计学意义上的BLS发病率没有明显的影响，而RH强烈影响BLS发病率。

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