美国白蛾于1995年在塘沽区发现。为了解美国白蛾在当地的发生规律，笔者从1995年秋季采蛹饲养开始，连续进行饲养观察和实地调查，基本掌握了此虫在本地的发生特点。 　　1)发生世代和时期。美国白蛾在塘沽地区每年发生3代。越冬蛹─般在 5月中旬羽化，第─代卵在 5月中、下旬 American white moth found in Tanggu District in 1995. In order to understand the occurrence rule of the American white moth in the local area, the author started from keeping the pupae in the autumn of 1995 and conducted continuous feeding observation and field investigation to basically grasp the peculiarities of this worm in the local area. 1) Generations and periods occur. American white moth occurs in Tanggu area 3 times a year. Overwintering pupae-like emergence in mid-May, the first generation of eggs in mid-May, late