Rhythm of Chilo suppressalis for overwintering generation to the search light traps

doi:10.16178/j.issn.0528-9017.20230751

Abstract

Abstract:

Chilo suppressalis is a major pest in rice. In order to determine the rhythm of the overwintering generation of Chilo suppressalis to the search light traps, we divided the night into 11 time points (19:00-20:00、20:00-21:00、21:00-22:00、22:00-23:00、23:00-0:00、0:00-1:00、1:00-2:00、2:00-3:00、3:00-4:00、4:00-5:00和5:00-6:00) from April 1 to May 31, and used four intelligent light to investigate the number of Chilo suppressalis at each time point respectively, at Chongfu Town, Shimen Town, Wuzhen town and Tudian Town, respectively. Four chronological peaks of the moth populations in different periods of the overwintering generation differed greatly. The first peak obviously occurred only at Chongfu during 20:00-21:00, with the trapped number accounting for 19.48% of the first peak. The second peak attracted the largest amount of moths in overwintering generation, reaching the climax during 20:00-21:00 that took up 19.67%, 20.42% and 19.31% of the second peak respectively in Chongfu, Shimen and Tudian town. According to the third and forth peak, it got to the climax during 22:00-23:00, 23:00-0:00, 1:00-2:00 and 1:00-3:00, 1:00-2:00, 21:00-22:00, respectively in Chongfu, Shimen and Tudian. No obvious moth peaks was detected at the Wuzhen. On the whole, the peak amount of the trapped moths appeared during 20:00-21:00, and the trapped amount in the first half of the night was close to 60%. The first peak was similar to the second one in terms of the rhythm of response to search light trap of the moths in overwintering generation, meanwhile, the rhythms of the two peaks above differed greatly from those of the third and the forth one. We found that the rhythm of Chilo suppressalis in different overwintering places is different, which can provide a theoretical basis for the local rice green control and ecological management of the moths.

Key words: Chilo suppressalis, search light trap, rhythm to the search light trap, overwintering

CLC Number:

S435

YAO Zhangliang, SHEN Yuejun, XU Weidong, LU Qiang. Rhythm of Chilo suppressalis for overwintering generation to the search light traps[J]. Journal of Zhejiang Agricultural Sciences, 2024, 65(11): 2636-2640.

Figures/Tables 4

Table 1 Basic information of the four intelligent monitoring and reporting points

测报站点	地理坐标	始见蛾期 (月-日)	诱蛾量/ 头
崇福	120°24'7″E,30°33'52″N	04-06	825
石门	120°25'59″E,30°40'53″N	04-06	340
乌镇	120°31'44″E,30°42'43″N	04-07	139
屠甸	120°36'23″E,30°33'39″N	04-07	430

Fig.1 The amount of overwintering Chilo suppressalis under search light traps

Fig.2 Proportion of hourly amount of Chilo suppressalis under the search light traps in the three monitoring and reporting points

Fig.3 Proportion of hourly amount of Chilo suppressalis under the search light traps in the overwintering generation and the second peak

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