Parasitization of beet leafhopper eggs, Circulifer tenellus, in California

Parasitoids attacking eggs of beet leafhopper, Circulifer tenellus (Baker) (Hemiptera: Cicadellidae), were surveyed at eight sites in southern and central California for 2 years. One site was an insecticide‐free sugar beet field, and the remaining sites were all uncultivated and supported weedy vegetation. At each site, host plants of beet leafhopper were collected and stored until parasitoids emerged from the leafhopper eggs in the vegetation. Vegetation samples included both naturally occurring host plants and sugar beet outplants that were first infested with beet leafhopper eggs in the laboratory and then placed in the field for 2 days. Parasitism generally was highest in summer and lowest in winter. Beet leafhopper eggs were parasitized by the mymarids (Hymenoptera: Mymaridae) Anagrus nigriventris Girault, Polynema eutettexi Girault, P. longipes (Ashmead), Polynema sp., Gonatocerus capitatus Gahan and two Gonatocerus spp. from the litoralis species group, and the trichogrammatids (Hymenoptera: Trichogrammatidae) Aphelinoidea zarehi Triapitsyn, Walker and Bayoun, A. turanica Trjapitzin, A. roja Triapitsyn, Walker and Bayoun, A. anatolica Nowicki and Paracentrobia sp. near P. subflava (Girault). The most dominant were A. nigriventris, A. zarehi and Paracentrobia sp. The intensity of parasitism varied greatly among the sites with peak levels ranging from 13% to 82%. Species composition also varied among sites, especially between the sugar beet field where A. nigriventris was by far the most dominant parasitoid and the uncultivated sites where A. zarehi and/or Paracentrobia sp. usually dominated. Within the uncultivated sites, parasitoid species composition also varied between the sugar beet outplants and the naturally occurring vegetation; A. nigriventris was much more common in the former than in the latter.     

几种具纤毛分生孢子的腔孢菌

本文报道了河北省具纤毛(setulae)分生孢子的腔孢菌(Coelomycetes)5种,它们隶属于多毛孢属(Polynema Lev.),星毛孢属(Stauronema H.Sydow,Sydow ＆Butler),刺杯毛孢属(Dinemasporium Lev.)和双毛壳孢属(Discosia Lib.)。其中多毛孢属和星毛孢属系国内新记录属。记载了一新种中国多毛孢(Polynema sinense w.-P.Wu)和一中国新记录种甘蔗星毛孢(Stauronema sacchari H.Sydow,Sydow ＆Butler)。在刺杯毛孢属和双毛壳孢属内共鉴定出3个种,它们是槭刺杯毛孢(Dinemasporium acerinum Peck),刚毛刺杯毛孢(Dinemasporium strigosum(Pets.:Ft.)Sate.)和双毛壳孢(Discosia artocreas(Tode:Fr。)Ff.)。文中对这些种进行了详细描述,新种有拉丁文描述。研究标本保藏于河北省科学院生物研究所。