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'Azadirachta indica' in keywords Facet   section ZfN Section C  [X]
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1984 (1)
1981 (1)
1Author    Heinz Rem, K. Laus-, Peter SieberRequires cookie*
 Title    Inhibition of Oogenesis and Ovarian Ecdysteroid Synthesis by Azadirachtin in Locusta migratoria migratorioides (R. & F.)  
 Abstract    The sterilizing effect of azadirachtin, an insect growth regulator from the neem tree, Azadirachta indica A. Juss, was tested with mature females o f Locusta migratoria. After a single injection of 10 |ig into females between 2 and 13 days after emergence, about 60% died during the following four days and all lost weight in the range of about 50%. If the compound was injected into animals of an age between 2 and 10 days, no maturation o f the terminal oocytes could be observed. Injection at an age between 10 and 13 days after adult emergence resulted in ovaries which contained almost mature oocytes. Most o f the treated locusts had no oviposition and only traces of ecdysteroids were present in their ovaries, as quantified by radioimmunoassay. The inhibition of oogenesis and o f ovarian ecdysteroid synthesis by azadirachtin is discussed on the basis of its interference with the neuroendocrine control of hormone synthesis. 
  Reference    Z. Naturforsch. 36c, 466 (1981); received November 10 1980/February 23 1981 
  Published    1981 
  Keywords    Locusta migratoria, Azadirachta indica, Ecdysteroids, Azadirachtin, Ovary 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0466.pdf 
 Identifier    ZNC-1981-36c-0466 
 Volume    36 
2Author    EloiS. Garcia, Patricia De Azambuja, Hans Forster, Heinz RemboldRequires cookie*
 Title    Feeding and Molt Inhibition by Azadirachtins A, B, and 7-Acetyl-azadirachtin A in Rhodnius prolixus Nymphs  
 Abstract    Development The antifeedant and antimolting effects of azadirachtins A and B, and of a synthetic derivative, 7-acetyl-azadirachtin A were examined. Given through a blood meal, the effective dose (E D 50) for the antifeedant effect ranged from 25 to 30 ng/ml of blood for the three compounds. ATP, a phagostimulant, also given orally, reversed the antifeedant action of azadirachtin A. The ED50 values for molt inhibition were 0.04, 0.015, and 0.45 (ig/ml of blood for azadirachtins A, B, and 7-acetyl-azadirachtin A, respectively. The mechanisms of feeding and molt inhibitions by azadirachtin A B, and its 7-acetyl-azadirachtin A derivative are discussed. 
  Reference    Z. Naturforsch. 39c, 1155—1158 (1984); received July 5/September 5 1984 
  Published    1984 
  Keywords    Rhodnius prolixus, Azadirachta indica, Azadirachtin, Antifeedant, Molt Inhibition, Ecdysis 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-1155.pdf 
 Identifier    ZNC-1984-39c-1155 
 Volume    39