| 摘要: |
| 以1971～1987年陕西关中主要产棉县一类棉田棉铃虫系统观测资料为依据,对影响其发生的主要因素进行分析,提出将关中棉区棉铃虫发生期统计标准分为渭、洛河下游早发区和泾、渭、沣河迟发区两个类型,并分别制定了棉铃虫发生期、发生程度、为害损失的统计标准。经对大荔、泾阳棉铃虫测报资料检验,历史符合率为97.6％,与发生实际相吻合。 |
| 关键词: 棉铃虫,发生期,发生量预测,虫害测报/发生程度,测报资料,统计标准 |
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| Studies on the Statistical Standards for Forecasting Data of Cotton Bollworm in Quanzhong Cotton-producing Areas |
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Wang Yaowen Mong Weixiao Liu Junsheng
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| Abstract: |
| Based on the systematic observations on the cotton bollworms from the first class of cotton fields in the main cotton-producing counties of Guanzhong (the central part of Shaanxi Province) during 1971-1987, this\ paper analyses the principal meteorological factors affecting cotton bollworm'semergence, suggesting that the statistical standards for the date of the pest-outbreak be divided into two types, the lower reaches of Weihe and Luohe rivers are earlier emergence region,and the Jinghe,Weihe and Fenghe valleys are later emergence region. It also presents the statistical standards for pest-outbreak date, grade and yield loss caused by the pest-outbreak. Examination of all the data from the forecasting stations of Dali and Jingyang counties shows that the conformity with historical reality is as high as 97.6%. |
| Key words: cotton bollworm, emergence date, prediction of emergence size, forecast of pest-outbreak /emergence grade, forecasting data, statistical standard |
