Rahman M Mahbubur, Kim Eunmok, Lim Un Taek
Regional Agricultural Research Station, Bangladesh Agricultural Research Institute, Rahmatpur, Barisal, Bangladesh.
Department of Plant Medicals, Andong National University, Andong, Republic of Korea.
J Econ Entomol. 2018 May 28;111(3):1202-1209. doi: 10.1093/jee/toy101.
Two unexplained phenomena are found in Riptortus pedestris (Fabricius) (Hemiptera: Alydidae): the first is that it tends to enter reproductive diapause much earlier in the season and to occur on host plants until late fall before finding hibernation site. The second is that they emerge in early spring when primary food sources such as leguminous plants are unavailable. To understand these phenological trends, the reproductive seasonality of both field-collected and laboratory-reared R. pedestris were compared under conditions of with/without food or access to mates. Females collected in spring or fall produced very few eggs in laboratory. But, when food sources were provided, all the bugs produced more eggs. Eggs also hatched normally except those produced by the females collected in fall. This indicates that females collected in the spring were already mated while those collected in the fall were not, most likely because they were in reproductive diapause. Similarly, when food was provided, all laboratory-reared bugs produced eggs, regardless of diapause status, with longer preoviposition period in diapausing bugs which might be due to the termination of reproductive diapause, but only eggs from mated females hatched. In conclusion, while spring reproduction (oviposition and egg hatch) of R. pedestris can occur in the presence of food resources, any lack of food can be limiting factor impeding these activities. In fall, reproduction is greatly reduced even when food resources are available, and under these conditions failure of females to become mated, due to reproductive diapause, is likely the limiting factor.
在稻绿蝽（稻绿蝽（Fabricius），半翅目：缘蝽科）中发现了两种无法解释的现象：第一种是它在季节早期往往更早进入生殖滞育，并在寄主植物上一直待到深秋才寻找冬眠地点。第二种是它们在早春出现，而此时豆科植物等主要食物来源尚未可得。为了理解这些物候趋势，在有/无食物或接触配偶的条件下，对野外采集和实验室饲养的稻绿蝽的繁殖季节性进行了比较。春季或秋季采集的雌性在实验室中产下的卵很少。但是，当提供食物来源时，所有的虫子都产下了更多的卵。除了秋季采集的雌性所产的卵外，其他卵也正常孵化。这表明春季采集的雌性已经交配，而秋季采集的雌性没有，很可能是因为它们处于生殖滞育状态。同样，当提供食物时，所有实验室饲养的虫子都产了卵，无论滞育状态如何，滞育虫子的产卵前期更长，这可能是由于生殖滞育的终止，但只有交配雌性的卵孵化。总之，虽然稻绿蝽在有食物资源的情况下可以进行春季繁殖（产卵和卵孵化），但任何食物短缺都可能成为阻碍这些活动的限制因素。在秋季，即使有食物资源，繁殖也会大大减少，在这些条件下，由于生殖滞育，雌性未能交配可能是限制因素。
