米象成虫触角感器及其取食偏好性

米象Sitophilus oryzae(L.)是重要的储粮害虫,如何有效防控仍是世界性的研究难题.应用扫描电镜研究了米象成虫触角感器的超微结构,证实了米象触角上仅分布3种感器,分别为毛形感器、刺形感器及锥形感器;采用嗅觉行为仪测定了米象对5种粮食的取食偏好性,结果表明:粮食对米象的引诱由强至弱依次为:燕麦湖北丁优大米黑米莲子薏米;同时观察了5种粮食对米象F1代种群生长发育的影响,发现在莲子中米象F1代发育历期最长,米象F1代种群数量在供试粮食中由多到少依次为:黑米燕麦薏米湖北丁优大米莲子.研究其触角感器与取食偏好可为探索米象防治新途径提供理论依据.

Ultrastructure of antennal sensilla and host preference of adult rice weevil

Rice weevil, Sitophilus oryzae ( L.) is one of the most destructive pests to stored products. To develop an effective S.oryzae management, ultrastructure of antennal sensilla of adult rice weevil was investigated by scanning electronic microscopy (SEM), and followed by observation on behavioral responses of adult S.oryzae to five common types of grain by Y-tube olfactometer and influences of feed on population development. Antennal sensilla observations were in accordance with previous study that there were only three types of antennal sensilla, including sensilla trichodea, sensilla basiconica and sensilla chaetica in S.oryzae. Oat was significantly more attractive to adult S.oryzae than other types of grain, which was followed by Hubei Dingyou rice, black rice, lotus seed and pearl barley in a descending order. S.oryzae F1 generation needed the longest time for developmental period in lotus seed. Furthermore, population of F1 generation varied among different types of grain, with the largest population in black rice, followed by in oat, pearl barley, Hubei Dingyou rice and lotus seed in a descending order. The findings were attributed to the development of comprehensive pest prevention and management.