１９９４～１９９５年采用小区试验和大田验证相结合的方法，研究了蔗田杂草两个主要优势种鼠曲和马唐的危害损失率及防治指标。两种草杂的种群密度（Ｘ）与甘蔗产量损失率（ｙ）之间的关系呈双曲线关系。鼠曲的危害损失估计模型为ｙ＝防治指标模型为．马唐的危害损失估计模型为；防治指标模型为。在目前前条件下，鼠曲和马唐的防治指标分别为每平方米有杂草２５株和２７株。 From 1994 to 1995, the harm loss rate and control index of the two main dominant species of caterpillar fungus, Curcuma longa and Crabgrass, were studied by the combination of plot test and field validation. The relationship between population density (X) and yield loss (y) of two kinds of grassy hybrids is hyperbolic. The harm loss estimation model of rat is as follows: y = control index model. Crab loss estimates of damage as a model; Under the current pre-conditions, the control indexes for the rat and crabgrass were 25 and 27 weeds per square meter, respectively.