Browsing by Author "1fd59521-ee24-4db0-95b1-591275ec2f1b"
Now showing items 21-35 of 35
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Pritschow, P.; Jakupovic, J.; Bohlmann, F.; Bittner, M.; Niemeyer, H. M. (1991)The aerial parts of Polyachyrus sphaerocephalus gave seven new eudesmane derivatives and a germacra-dien-diol while a reinvestigation of P. fuscus afforded a new caryophyllene, two nerolidolglycosides, a curcumene and two ...
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Zdero, C.; Bohlmann, F.; Niemeyer, H. M. (1988)The aerial parts of Oxyphyllum ulicinum afforded, in addition to known compounds, 15 new germacrane derivatives with a 1β, 10α-epoxide, a carboxyl group at C-4, and different ester groups at C-9 and C-14. From the aerial ...
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Gonzáles, W. L.; Ramírez, C. C.; Olea, N.; Niemeyer, H. M. (2002)Induced plant responses may affect the behaviour and growth of the attacking herbivore insect. The aphid Sipha flava (Forbes) produces reddish spots on the infested leaf of its host plant Sorghum halepense (L.). In order ...
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Givovich, A.; Morse, S.; Cerda, H.; Niemeyer, H. M.; Wratten, S. D.; Edwards, P. J. (Kluwer Academic Publishers-Plenum Publishers, 1992)DIMBOA glucoside (2-O-/gb-D-glucopyranosyl-4-hydroxy-7-meth-oxy-1,4-benzoxazin-3-one), the main hydroxamic acid (Hx) in intact wheat plants, was detected in the honey dew of Rhopalosiphum padi feeding on seedlings of six ...
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Fuentes-Contreras, J. E.; Powell, W.; Wadhams, L. J.; Pickett, J. A.; Niemeyer, H. M. (Blackwell Publishing Ltd, 1996)The effects of three wheat cultivars and two oat cultivars on the development of the cereal aphid parasitoid Aphidius rhopalosiphi De Steph, and the generalist aphid parasitoid Ephedrus plagiator (Nees) (Hymenoptera: ...
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Zdero, C.; Bohlmann, F.; Niemeyer, H. M. (1988)A reinvestigation of the aerial parts of Pleocarphus revolutus afforded, in addi tion to sesquiterpenes isolated previously, four new guaiane derivatives and four isocedrene derivatives, one of which is new. Furthermore, ...
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Villagra, C. A.; Pinto, C. F.; Penna Varela, Mario; Niemeyer, H. M. (2011)We, herein, report evidence that wing fanning by the aphid parasitoid Aphidius ervi Haliday (Hymenoptera: Braconidae) constitutes a courtship song. Complete removal of the forewings or only the distal half of them reduced ...
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Russell, G. B.; Bowers, W. S.; Keesing, V.; Niemeyer, H. M.; Sevenet, T.; Vasanthaverni, S.; Wratten, S. D. (2000)Nothofagus species from Chile and New Zealand were surveyed in the field for invertebrate abundance and leaf feeding damage and in the laboratory for antifeedant activity against leafrollers (Ctenopsteustis obliquana, ...
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Possible involvement of the phloem sealing system in the acceptance of a plant as host by an aphid Caillaud, C. M.; Niemeyer, H. M. (Birkhauser Verlag AG, 1996)Possible reasons for the rejection of some lines of Triticum monococcum (Tm44 and Tm46) by the aphid Sitobion avenae were explored. In all T. monococcum lines studied, whether unfavourable (non-host/resistant plant) or ...
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Givovich, A.; Sandström, J.; Niemeyer, H. M.; Pettersson, J. (Kluwer Academic Publishers-Plenum Publishers, 1994)Phloem sap of wheat seedlings differing in whole leaf hydroxamic acid (Hx) concentrations was collected by cutting stylets of feeding aphids. DIMBOA-glucoside was the only Hx-related product found. Concentration of ...
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THACKRAY, D. J.; WRATTENT, S. D.; EDWARDS, P. J.; NIEMEYER, H. M. (1990)Aribiotic resistance to the aphid Sitobion avenae was assessed in relation to levels of hydroxamic acids (Hx) in a wide genetic range of cultivars and species of Triticum. Within hexaploid and tetraploid Triticum material, ...
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Zdero, C.; Bohlmann, F.; Niemeyer, H. M. (1991)The aerial parts of Haplopappus parvifolius afforded 30 new diterpenes including 21 labdane derivatives, four nor-diterpenes, three rearranged ones, four seco-labdanes and one with a new carbon skeleton whose structure was ...
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Zdero, C.; Bohlmann, F.; Niemeyer, H. M. (1990)The extract of the aerial parts ofO. floribundus afforded in addition to known compounds 17 new diterpenes, including eightseco-ent-labdanes with a very rare carbon skeleton. The structures were elucidated by high field ...
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Quiroz, A.; Pettersson, J.; Pickett, J. A.; Wadhams, L. J.; Niemeyer, H. M. (Springer New York LLC, 1997)Olfactometry using an apterous individual of Rhopalosiphum padi (L.) showed an arresting effect by volatiles from a wheat seedling and a repellent effect by volatiles from a wheat seedling infested with aphids at a high ...
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Zdero, C.; Bohlmann, F.; Niemeyer, H. M. (1990)The extract of the aerial parts of Perityle emoryi gave, in addition to seven known sesquiterpene lactones, six new germacranolides and a guaianolide as well as a further thymol derivative together with several known ones ...