高州市高空测报灯下草地贪夜蛾成虫数量动态

为了明确粤西草地贪夜蛾Spodoptera frugiperda(Smith)发生动态，在广东茂名高州设置了高空测报灯，2020年 5月-2021年12月连续观察了灯下该虫成虫数量及性比。研究结果表明高州地区草地贪夜蛾成虫全年均可发生，总体动态情况如下：（1）年度间蛾量消长动态（蛾量、盛期、高峰日等）均存在显著差异，其中日均蛾量2020年为18.58头，2021年为8.11头，降低了56.35%；（2）3-11月均可能出现盛期和高峰期，其中5-8月为全年盛期，蛾量较大、盛期明显，3-4月及9-11月蛾量较少、盛期不显著，12月-次年2月蛾量进入低谷期；（3）每个盛期均会出现多个发蛾高峰日，以2~3个为主；（4）发蛾盛期时间长度一般为7~17 d，平均13.2 d；（5）灯下以雄蛾为主，占总蛾量79.1%，且不同季节雄蛾比例不同，最高达98.9%；（6）灯下虫源性质是不断变化的，以混合型为主，典型的居留型（包括迁入型）和迁出型比例均较低；（7）全年本地成虫应可发生8个代次左右。

Dynamics of Spodoptera frugiperda (Smith) adults under vertical-pointing searchlight-trap in Gaozhou

In order to clarify the occurrence dynamics of the fall armyworm Spodoptera frugiperda (Smith) in western Guangdong, a vertical-pointing searchlight-trap was set up in Gaozhou, Maoming, Guangdong. The number and sex ratio of the adults under the trap were continuously collected and observed from May 2020 to December 2021. The results showed that fall armyworm adults can occur all year round in Gaozhou, and the overall dynamics were as follows: (1) there were significant difference in the dynamics of the adult number (peak period, peak day, moth number, etc.) in 2020 and 2021, in which the daily average moth number was 18.58 in 2020, and 8.11 in 2021 with decrease of 56.35%; (2) The peak period and peak day might occur from March to November. The peak period of the whole year with large quantity moths and obvious peaks was from May to August. On the contrary, the moth number was small and the peak period was not significant from March to April and September to November. The moth number entered the trough period from December to February of the next year; (3) There were more than one peak day for the moth in each peak period, mainly 2~3; (4) The peak period of the moth was generally 7~17 days, with an average of 13.2 days; (5) Under the lamp, male moths dominated, accounting for 79.1% of the total moths, and the proportion of male moths varied in different seasons, with the highest proportion of 98.9%; (6) The type of the moth source was constantly changing, mainly mixed type, and the proportion of typical residence type (including immigration type) and emigration type was low; (7) The local adults should have about 8 generations in the whole year in Gaozhou.