The population trend index reflects the suitability of the plant, and so sweetpotato was the best, Chinese kale and tobacoo were the better, and tobacco and cotton were the least suitable.

• 以种群趋势指数作为衡量寄主植物对B型烟粉虱的适宜度指标，甘薯为最适寄主植物，芥蓝和番茄次之，烟草和棉花较差。