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Scientia Silvae Sinicae ›› 2019, Vol. 55 ›› Issue (2): 137-142.doi: 10.11707/j.1001-7488.20190214

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Survey of Natural Enemies in Gall of Trichagalma acutissimae (Hymenoptera: Cynipidae) and Biological of Its Predominant Parasitoids

Zhang Yuanchen1, Su Shanyu2, Liu Ping3, Zhang Yuxiao3, Zhang Kunpeng1, Wang Jingshun1   

  1. 1. College of Biological and Food Engineering, Anyang Institute of Technology Anyang 455000;
    2. Forestry Disease and Pest Control Station of Anyang, Henan Province Anyang 455000;
    3. Forestry Bureau of Linzhou, Henan Province Linzhou 456550
  • Received:2018-08-07 Revised:2018-09-14 Online:2019-02-25 Published:2019-03-20

Abstract: [Objective] Trichagalma acutissimae(Hymenoptera:Cynipidae) is one of the important pests harming afforestation plants Quercus variabilis and Q.acutissima(Fagaceae).The pest forms galls and feeds in galls,which is hidden,thus it is very difficult to control the pest by chemical pesticide.However the pest may be effectively controlled by using natural enemies.The present study aimed to determine the species and biological characteristics of natural enemies in the galls of T.acutissimae and provide a scientific basis for the prevention and control of the gall wasp with natural enemies.[Method] In this study,field investigation and indoor anatomy of the galls during wintering and gall growing period were carried out to investigate the species of natural enemies in the galls and their life history and behavioral characteristics of dominant natural enemies.[Result] There were three dominant natural enemies in the gall of T.acutissimae:Torymus sp.(Hymenoptera:Torymidae),Eurytoma sp.(Hymenoptera:Eurytomidae) and Pteromalus sp.(Hymenoptera:Pteromalidae).They all overwintered with larva in the gall of asexual insects.Torymus sp.had two generations a year.The overwintering adults began to appear in early May and oviposited in the asexual galls.The first generation of adults emerged in early July.Eurytoma sp.occurred two generations yearly,overwintered generation adult emerged in early June and laid eggs in the asexual galls.After those eggs developed,the first generation of adults turned up in middle June.Pteromalus sp.had three generations a year.The overwintered generation began eclosion in early April and laid eggs in gall of sexual generation.The first generation of adults arose in the middle of May,and then laid eggs in gall of asexual generation.Afterwards,the second generation of adults began to appear in late June.[Conclusion] The dominant natural enemies in T.acutissimae are Torymus sp.,Eurytoma sp.and Pteromalus sp.,which can be used as biocontrol agents for biological control of larva of T.acutissimae.

Key words: aboveground biomass, belowground biomass, dummy variable, error-in-variable, simultaneous equations

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