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四年的调查表明,幼虫在青铃中的累计增长曲线呈 S 型,说明为害青铃的幼虫全年有两个增长期,一个是从7月下旬到9月初,另一个是从9月中、下旬到10月初,基本上代表了2代和3代的为害,据此估计的2代和3代在全年为害中所占的比例分别是62%和38%。分析表明,早期虫量和全年最终虫量显著线性相关,据此建立了预测式:Y=0.655+8.8852x,对预测式进行了验证,结果表明,预测误差是可以接受的,进而讨论了它在防治指标中的应用。
Four-year survey showed that the cumulative growth curve of larvae in the Cymbidium was S-shaped, indicating that the larvae that harm Cyanobacteria have two growth periods throughout the year, one from late July to early September and the other from mid-September From late October to early October, basically representing the second and third generations of victims, the estimated second and third generation share of the annual damage were 62% and 38% respectively. The analysis showed that there was a significant linear correlation between the amount of early worms and the final amount of pests in the whole year. Based on this, the predictive formula was established: Y = 0.655 + 8.8852x, and the predictive formula was verified. The results showed that the prediction error was acceptable and then discussed Its application in prevention and control index.