National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang 550025, China.
School of Plant Protection, Hainan University, Haikou 570228, China.
J Econ Entomol. 2023 Dec 11;116(6):2043-2051. doi: 10.1093/jee/toad180.
The thrips Megalurothrips usitatus Bagnall and Frankliniella intonsa Trybom (Thysanoptera: Thripidae) are important pests in cowpea-growing areas of south China. Parthenogenesis is an important reproductive form of thysanopterans, and plays an important role in maintaining population growth. To understand the developmental and reproductive characteristics of these 2 thrips species during parthenogenesis, we compared the age-stage life tables of M. usitatus and F. intonsa on cowpea pods under natural regimes during the summer and winter. The results showed that the total preadult period and total preoviposition period of M. usitatus were significantly longer than those of F. intonsa in both seasons. Moreover, longevity of adult M. usitatus (29.53 days) was shorter compared with adult F. intonsa (34.00 days) in summer, whereas higher fecundity (220.8 eggs/female) and more oviposition days (37.83 days) were observed in M. usitatus compared with F. intonsa in winter (fecundity = 179.83 eggs/female, oviposition days = 33.03 days). The net and gross reproductive rates of M. usitatus were significantly greater than those of F. intonsa during winter. In addition, the intrinsic and finite rates of increase of M. usitatus were significantly lower than those of F. intonsa, and the mean generation time of M. usitatus was significantly longer than that of F. intonsa both in summer and winter. These results indicated that parthenogenesis has species specificity among thrips, which in turn affects population development, especially under changing environments.
在中国南方的豇豆种植区，缨翅目蓟马 Megalurothrips usitatus Bagnall 和 Frankliniella intonsa Trybom 是重要的害虫。孤雌生殖是缨翅目昆虫的一种重要繁殖形式，对维持种群增长起着重要作用。为了了解这 2 种蓟马在孤雌生殖过程中的发育和繁殖特征，我们在夏季和冬季自然条件下比较了它们在豇豆荚上的年龄-阶段生命表。结果表明，在两个季节中，M. usitatus 的总预成虫期和总预产卵期都显著长于 F. intonsa。此外，M. usitatus 成虫的寿命（29.53 天）在夏季短于 F. intonsa（34.00 天），而在冬季，M. usitatus 的产卵量（220.8 枚/雌）和产卵日数（37.83 天）高于 F. intonsa（产卵量=179.83 枚/雌，产卵日数=33.03 天）。在冬季，M. usitatus 的净生殖率和总生殖率明显大于 F. intonsa。此外，M. usitatus 的内禀增长率和有限增长率明显低于 F. intonsa，在夏季和冬季，M. usitatus 的平均世代时间明显长于 F. intonsa。这些结果表明，孤雌生殖在蓟马中具有种特异性，这反过来又影响了种群的发展，特别是在环境变化的情况下。
