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1992年除稻瘟病偏重流行、棉铃虫大发生外,我国农作物主要病虫为中等发生年。根据越冬菌源、秋后残虫量,结合种植业结构调整情况和品种布局的变化,以及明年长期天气预报等综合分析,预计1993年农作物主要病虫的发生将重于1992年,总体将是一个偏重发生趋势。1 麦类病虫据中央气象台的长期天气预报,1992年长江流域气温接近常年,北方大部分地区气温偏高,加之近年麦类生产水平提高,灌溉田面积增加等原因,预计1993年白粉病在大部分冬麦区将达到中等以上流行程度,发病面积将超过1.5亿亩;小麦纹枯病近两年在江淮及黄淮麦区已上升成为主要病害之一,菌源较广,预计纹枯病1993年在常发区将中
In addition to the prevalence of rice blast in 1992, the occurrence of large bollworm, the main pests and diseases of crops in our country for the middle of the year. According to the overwintering bacteria sources, the quantity of the late autumn caterpillars, combined with the adjustment of the planting structure and variety distribution, as well as comprehensive analysis of the long-term weather forecast next year, it is estimated that the occurrence of main pests and diseases of crops in 1993 will be heavier than in 1992 and the overall will be A tendency to bias. 1 wheat pest and disease According to the long-term weather forecast of the Central Meteorological Observatory, the temperature in the Yangtze River Basin in 1992 nearly perennial, high temperatures in most parts of the north, coupled with increased wheat production in recent years, an increase in irrigated land and other reasons, is expected to powdery mildew in 1993 Most of the winter wheat area will reach above the average degree of prevalence, the incidence of area will be more than 150 million mu; wheat sheath blight nearly two years in the JAC and Huanghuai wheat area has risen to become one of the major diseases, a wide source of bacteria is expected to withered Illness in 1993 will be in the zone