›› 2017, Vol. 29 ›› Issue (1): 106-112.DOI: 10.3969/j.issn.1004-1524.2017.01.15

• Plant Protection • Previous Articles     Next Articles

Feasibility of Trifolium repens and Oxalis corniculata as the nectar resource plant to Trichogramma chilonis

ZHAO Yanyan1, 2, TIAN Junce1, ZHENG Xusong1, XU Hongxing1, LU Yanhui1, YANG Yajun1, ZANG Liansheng3, LYU Zhongxian1, 2, *   

  1. 1. Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China;
    2.College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China;
    3. Insititute of Biological Control, Jilin Agricultural University, Changchun 130118, China
  • Received:2016-03-23 Online:2017-01-15 Published:2017-02-23

Abstract: As an effective way to improve biological control, nectar resource plant has been widely used in agro-ecosystem. Our previous experiment proved that planting nectar resource plant (Sesamum indicum) around the rice paddy field had made a great success in enhancing biological control of rice insect pests. However, due to the cultivation limitations of S. indicum, it is necessary to screening more acceptable, alternative nectar resource plants for different rice growing regions. Clovers, including Trifolium repens with white flower and Oxalis corniculata with red flower, are perennial plants with long florescence and easy to cultivate around rice paddy fields, and are potential candidates as nectar resource plants. In present study, we surveyed whether these two kinds of clover could prolong longevity and improve fecundity of Trichogramma chilonis, the dominant egg parasitoid of Lepidoptera pests. We also analyzed the nectar content of O. corniculata flowers in different time and the nectar compositions. The results showed that O. corniculata could extend longevity and improve fecundity of T. chilonis significantly. T. repens could extend longevity and improve fecundity of T. chilonis, but there was no significant difference between T. repens-fed treatment and water-fed treatment. The test of nectar content showed that O. corniculata flowers had the highest nectar content from 14:00 to 16:00. T. repens flowers were basically in bloom for 24 h, but O. corniculata flowers were only open in the daytime. After 20:00, O. corniculata flowers were all closed. O. corniculata flowers contained a mass of nectar content and could significantly improve parasitic wasp biological fitness. Furthermore, O. corniculata flowers were only blooming during the daytime, which indicated that O. corniculata does not benefit moths. In conclusion, O. corniculata could be utilized as a potential nectar resource plant in rice-based agroecosystem.

Key words: clover, nectar resource plant, Trichogramma chilonis, biological control

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