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Memórias do Instituto Oswaldo Cruz

Print version ISSN 0074-0276On-line version ISSN 1678-8060

Mem. Inst. Oswaldo Cruz vol.85 no.1 Rio de Janeiro Jan./Mar. 1990

http://dx.doi.org/10.1590/S0074-02761990000100002 

Short and long-term effects of azadirachtin A on development and egg production of Rhodnius prolixus

Eloi S. Garcia1 

Denise Feder1 

José Eugênio P. Lima Gomes1 

Heinz Rembold2 

Instituto Oswaldo Cruz, Departamento de Bioquimica e Biologia Molecular, Rio de Janeiro, Brasil

Max-Planck-Institut für Biochemie, München, Germany


ABSTRACT

Azadirachtin A was given through a blood meal to 4th-instar larvae and to adult females of Rhodnius prolixus. Development (ecdysis) and egg production were inhibited in a dose-dependent manner. Long-term experiments with subsequent four feedings on azadirachtin-free blood were performed with 4th-instar larvae and with adult females. Only in the low-dose azadirachtin larval groups (0.01 and 0.1 microng/ml of blood), development was partially restored; after a single 1.0 microng/ml treatment about 50% of the treated larvae were still alive 120 days later without any adult emergence. Similarly fed females had a dose-dependent lower survival and egg deposition rate. The results are discussed in relation to the mode of azadirachtin A action.

 

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