【摘要】 以云南烟草丛枝症病株为毒源， 通过蚜虫传染接种不同生育期的烤烟， 测定烟株的发病率， 以及烤烟生物学性状和产量产值的变化． 结果表明： 烤烟整个生育期都会感染烟草丛枝症病害， 感染时期与发病率相关性不显著， 但与潜育期相关性极显著， 烟叶产量田间损失率取决于感病时期， 相关方程为： Ｙ＝ １２９４１９ － １７１７ Ｘ （ Ｘ 为假植至接种的天数） ． 由此可确定适宜的防治时间， 测定防治效果， 对提高防效和增加效益具有重要意义．更多还原

【Abstract】 By using the tobacco witches’ broom symptom disease as the virus source, The tobacco has been vaccinated by the aphid infection during the different growing period. The disease rate, the tobacco biological character, and the change of the yield and the production value have been measured. Consequently, tobacco can be infected by the tobacco witches’ broom symptom disease during the whole growing period. The correlation between the infection period and the disease rate is not obvious. However, it is evident that there is a correlation between the infection period and the seedling cultivating period. The yield loss of the tobacco leaf directly results from the infection period. The correlation equation is Y =129 419-1 717 X ( X is the days from the artificial planting to the vaccinating). Therefore, the proper prevention time and the prevention efficacy can be determined. This is very important to improve the prevention efficacy and promote the economic value.更多还原