Scientia Agricultura Sinica ›› 2016, Vol. 49 ›› Issue (23): 4669-4676.doi: 10.3864/j.issn.0578-1752.2016.23.019

• RESEARCH NOTES • Previous Articles    

Functional Response and Numerical Response of Two Geographic Populations of Trichogramma dendrolimi to the Eggs of Rice Moth, Corcyra cephalonica

DU Wen-mei1, ZANG Lian-sheng1, ZHANG Jun-jie1, QI Ying-hui2, RUAN Chang-chun1   

  1. 1Institute of Biological Control, Jilin Agricultural University/Engineering Research Center of Natural Enemy Insects, Changchun 130118
    2Jilin Provincial Agro-Tech Extension Center, Changchun 130021)
  • Received:2016-05-04 Online:2016-12-01 Published:2016-12-01

Abstract: 【Objective】 Trichogramma dendrolimi is a widely used parasitoid in biological control. There are some differences in different geographic populations of T. dendrolimi and its biological characteristics. This study aimed at understanding the parasitic functional response and numerical response of two typical geographic populations to eggs of the rice moth, Corcyra cephalonica so that provided a reference for the application of different geographical populations of the parasitic wasp species.【Method】 C. cephalonica eggs were used as the host, and the functional response and numerical response of two geographic populations of T. dendrolimi from Heilongjiang and Jiangsu parasitizing were investigated. The species flocks of trend index (I) and index of population control (IIPC) of the two different geographical populations were compared and analyzed.【Result】 The parasitic functional responses of Heilongjiang population (TD-HLJ) and Jiangsu population (TD-JS) of T. dendrolimi fitted in with HollingⅡ equation. The daily maximum parasitic number of TD-HLJ was 186.78 eggs, more 75.68 eggs than that of TD-JS. The density of 1 grain of C. cephalonica egg was the critical value of TD-HLJ and TD-JS populations of eclosion. The density of C. cephalonica eggs had significant impact on parasitism, development and reproduction of both populations. 5 and 10 eggs of C. cephalonica were the critical values of TD-HLJ and TD-JS population reproduction. The population trend index (I) of both populations increased with the increase of host egg density. Generally, both of populations had the values of I under the control density with 68.70 for TD-HLJ and 49.20 for TD-JS, which indicated that the number of offsprings of TD-HLJ was 19.5 times of that of TD-JS. Similarly, interference of index of population control (IIPC) of both populations increased with the increase of host egg density, indicating that the biological control effectiveness of T. dendrolimi against hosts decreased with egg density increasing.【Conclusion】 Based on the comprehensive analysis on the results of functional response and numerical response, TD-HLJ exhibits better biological control potential than TD-JS in the insect pest management.

Key words: Trichogramma dendrolimi, geographic populations, Corcyra cephalonica egg, functional response, numerical response

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