马铃薯块茎蛾的交配行为

在温度为(24±2)℃、光周期为L∶D=14∶10、相对湿度为50%～70%环境条件下观察了马铃薯块茎蛾Phthorimaea operculella(Zeller)交配行为。结果表明,1～2日龄、3～4日龄成虫交配高峰期分别发生在进入暗期后的8.0～10.0h、6.5～8.0h内。两性交配率随日龄的增加显著下降。马铃薯块茎蛾雄成虫具有多次交配能力,在连续发生2次以上行为交配时会导致雄蛾有效交配率下降。雄蛾平均有效交配次数可达3.8次/头,最高达6次。增加雄性比例不会显著提高单雌产卵量,但将性比(♀:♂)由1∶1升至2∶1时即可显著降低单雌产卵量。

Mating behavior of potato tuber moth, Phthorimaea operculella

Mating behavior of the potato tuber moth,Phthorimaea operculella（Zeller）,was investigated under laboratory conditions（24 ± 2） ℃,L：D = 14：10,RH（50% —70%）.The mating peak of adults from the first to second instar occurred from the 8.0 hour to the end of scotophase,whereas that of adults from the third to the forth instar was from the 6.5 to 8.0 hour after the onset of scotophase.The mating rate of both sexes decreased significantly in successive instars and the effective mating rate decreased significantly when males had mated more than two times.The effective mating frequency of males ranged from 0—6 with an average of 3.8.The number of eggs deposited per female was not significantly increased by increasing the proportion of males in the population and was significantly reduced when the sex ratio（♀：♂） changed from 1：1 to 2：1.