Parasitic Behavior of <i>Coccophagus japonicus</i> Compere
Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2019, Vol. 40 ›› Issue (3): 535-540.DOI: 10.3969/j.issn.1000-2561.2019.03.017

• Crop Pests, Diseases and Their Control, Environmental Protection • Previous Articles     Next Articles

Parasitic Behavior of Coccophagus japonicus Compere

LI Xian1,2,FU Yueguan1,ZHU Junhong2,*(),WU Xiaoshuang1,2,CHEN Junyu1,LI Lei1,HAN Dongyin1,NIU Liming1,ZHANG Fangping1,*()   

  1. 1. Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China
    2. Institute of Tropical Agriculture and Forestry, Hainan University, Haikou, Hainan 570228, China
  • Received:2018-08-17 Revised:2019-01-06 Online:2019-03-15 Published:2019-03-15
  • Contact: ZHU Junhong,ZHANG Fangping

Abstract:

Coccophagus japonicus Compere is one of the important natural enemies of Parasaissetia nigra Nietner. In order to understand the parasitic behavior of the parasitic wasp and the effect of female body size on oviposition, the parasitic behavior of the parasite wasp and the oviposition of female wasps with different body sizes were observed in the laboratory. The results showed that the parasitic process of C. japonicus Compere consisted of five stages: searching for hosts, identifying hosts, probing by ovipositor, laying eggs and post-oviposition treatment. The parasitic duration, parasitic rate, and average egg numbers increased with the parasitic time. The coincidence ratio between parasitic frequency and egg number decreased with the parasitic time. When the wasps parasitized for the first time, the parasitic duration, the parasitism rate, the coincidence ratio between parasitic frequency and egg number, the average egg number was 19.75 s, 73.12%, 69.89% and 0.76, respectively; When the wasps parasitized the same hosts for the third time, the parasitic duration, the parasitism rate, the coincidence ratio between parasitic frequency and egg number and the average egg number was 24.37, 83.33%, 8.33% and 1.67, correspondingly. There was a positive correlation between the body size of female wasps and oviposition, and the daily fecundity and parasitic rate of female wasps increased with the body sizes of female wasps. When the body length of female wasps is less than 1.20 mm, the average fecundity and parasitic rate were relatively smaller, which was 16.83 and 49.4%, respectively. When the body length was between 1.40 mm and 1.50 mm, the average fecundity and parasitic rate was 33.06 and 72.3%, respectively. When the body length was longer than 1.50 mm, the average fecundity and parasitic rate was 37.5 and 72.2%, respectively; The length of the posterior tibia of female wasps had a similar effect on oviposition and parasitic rate. It is suggested that the larger female wasps should be used in the reproduction expansion.

Key words: Coccophagus japonicus Compere, parasitic behavior, body size, parasitic time, parasitism rate, daily eggs production