A new species of Anastatus Motschulsky, 1859 （Hymenoptera： Eupelmidae）, A. orientalis Yang ＆ Choi, sp. nov. is described from China. It is a solitary endo-parasitoid in egg of the spotted lanternfly, Lycorma delic...A new species of Anastatus Motschulsky, 1859 （Hymenoptera： Eupelmidae）, A. orientalis Yang ＆ Choi, sp. nov. is described from China. It is a solitary endo-parasitoid in egg of the spotted lanternfly, Lycorma delicatula （White） （Homoptera： Fulgoridae）, which causes damages to many ornamental and fruit trees in China. The brief biology of the new parasitoid is also mentioned. The new species has high potential as a biocontrol agent for suppression of the pest because of its parasitism rates of egg masses 30.4% and of eggs 40.2% respectively with sex ratio of female to male 1.9：1.0, as well as the relative easiness for mass rearing. The detailed feature characters and photos of the new species are supplied. Meanwhile, a key to distinguish the present new species from the other close two （A. japonicus and A. bifasciatus） in the genus is provided. Type specimens are deposited in the Insect Museum, Chinese Academy of Forestry, Beijing, China.展开更多
We show that induced synomones, emitted as a consequence of Murgantia histrionica activity on Brassica oleracea, are adsorbed by the epicuticular waxes of leaves and perceived by the egg parasitoid Trissolcus brochyme...We show that induced synomones, emitted as a consequence of Murgantia histrionica activity on Brassica oleracea, are adsorbed by the epicuticular waxes of leaves and perceived by the egg parasitoid Trissolcus brochymenae. Leaves were exposed to M. histrionica females placed on the abaxial leaf surface. After 24 h, the leaves were treated mechanically using gum arabic, or chemically using chloroform, on the adaxial surface, and finally the adaxial surface was assayed with T. brochymenae by two-choice tests in a closed arena. Wasp females responded to mechanically dewaxed cabbage leaf portions with feeding punctures and footprints （Ff） and with feeding punctures, oviposition and footprints （FOr）, showing no effect of wax removal. In contrast, the removal of the epicuticular waxes from leaf portions close to FOf, and from leaves with oviposition and footprints （Of）, determined the lack of responses by T. brochymenae. Solvent extracts of different treatments were bioassayed, but only FOr triggered parasitoid response. Thus the detection of oviposition-induced synomones by the parasitoid depends on their adsorption by the epicuticular waxes. Mechanical wax removal from leaf portions contaminated with host footprints （f） also determined a lack of wasp responses, suggesting that the footprints might trigger the induction of a ＂footprint-induced synomone＂ adsorbed onto the epicuticular waxes and exploited by the parasitoid. Leaf portions with the abaxial lamina previously dewaxed and then contaminated by footprints （D＋f） of M. histrionica did not affect the parasitoid response, indicating that the abaxial epicuticular waxes are not directly involved in the chemicals induced by M. histrionica footprints.展开更多
Hopper egg parasitoid communities in rice field were made up of Mymaridae and Trichogrammatidae. Anagrus ,which belonged to Mymaridae was the most numerous genus in the communities.In order of number: Anagrus>Gonat...Hopper egg parasitoid communities in rice field were made up of Mymaridae and Trichogrammatidae. Anagrus ,which belonged to Mymaridae was the most numerous genus in the communities.In order of number: Anagrus>Gonatocerus>Neurotes>Mymar .The percentage of Trichogrammatidae was always low.The parasitiods of Mymaridae were the dominant natural enemies to rice hoppers,and had higher percentage in IPM rice fields than that in non IPM ones.The dynamics of the communities had close relationship with the growth of rice,and could be divided into three steps: reestablishment,development and collapse.The hopper egg parasitoid communities in IPM rice fields reestablished more quickly,developed more steadily,and collapsed more gently than those in non IPM ones.展开更多
文摘A new species of Anastatus Motschulsky, 1859 （Hymenoptera： Eupelmidae）, A. orientalis Yang ＆ Choi, sp. nov. is described from China. It is a solitary endo-parasitoid in egg of the spotted lanternfly, Lycorma delicatula （White） （Homoptera： Fulgoridae）, which causes damages to many ornamental and fruit trees in China. The brief biology of the new parasitoid is also mentioned. The new species has high potential as a biocontrol agent for suppression of the pest because of its parasitism rates of egg masses 30.4% and of eggs 40.2% respectively with sex ratio of female to male 1.9：1.0, as well as the relative easiness for mass rearing. The detailed feature characters and photos of the new species are supplied. Meanwhile, a key to distinguish the present new species from the other close two （A. japonicus and A. bifasciatus） in the genus is provided. Type specimens are deposited in the Insect Museum, Chinese Academy of Forestry, Beijing, China.
文摘We show that induced synomones, emitted as a consequence of Murgantia histrionica activity on Brassica oleracea, are adsorbed by the epicuticular waxes of leaves and perceived by the egg parasitoid Trissolcus brochymenae. Leaves were exposed to M. histrionica females placed on the abaxial leaf surface. After 24 h, the leaves were treated mechanically using gum arabic, or chemically using chloroform, on the adaxial surface, and finally the adaxial surface was assayed with T. brochymenae by two-choice tests in a closed arena. Wasp females responded to mechanically dewaxed cabbage leaf portions with feeding punctures and footprints （Ff） and with feeding punctures, oviposition and footprints （FOr）, showing no effect of wax removal. In contrast, the removal of the epicuticular waxes from leaf portions close to FOf, and from leaves with oviposition and footprints （Of）, determined the lack of responses by T. brochymenae. Solvent extracts of different treatments were bioassayed, but only FOr triggered parasitoid response. Thus the detection of oviposition-induced synomones by the parasitoid depends on their adsorption by the epicuticular waxes. Mechanical wax removal from leaf portions contaminated with host footprints （f） also determined a lack of wasp responses, suggesting that the footprints might trigger the induction of a ＂footprint-induced synomone＂ adsorbed onto the epicuticular waxes and exploited by the parasitoid. Leaf portions with the abaxial lamina previously dewaxed and then contaminated by footprints （D＋f） of M. histrionica did not affect the parasitoid response, indicating that the abaxial epicuticular waxes are not directly involved in the chemicals induced by M. histrionica footprints.
文摘Hopper egg parasitoid communities in rice field were made up of Mymaridae and Trichogrammatidae. Anagrus ,which belonged to Mymaridae was the most numerous genus in the communities.In order of number: Anagrus>Gonatocerus>Neurotes>Mymar .The percentage of Trichogrammatidae was always low.The parasitiods of Mymaridae were the dominant natural enemies to rice hoppers,and had higher percentage in IPM rice fields than that in non IPM ones.The dynamics of the communities had close relationship with the growth of rice,and could be divided into three steps: reestablishment,development and collapse.The hopper egg parasitoid communities in IPM rice fields reestablished more quickly,developed more steadily,and collapsed more gently than those in non IPM ones.
