Abstract
The effect of azadirachtin on the development and mortality of the scuttle fly, Megaselia scalaris (Loew) (Diptera: Phoridae) was investigated in the laboratory by using neem extract, Achook®, containing 0.15% azadirachtin. Different biological changes were recorded after treatment 1st larval instar with different concentrations of azadirachtin as larval mortality, pupation rate and adult emergence of. Azadirachtin-LC50 against the 1st instar larvae of M. scalaris was 13.79 mg/L. Exposing larvae to LC50 of azadirachtin caused many changes in the puparia such as having folded cuticle and swelling of the integument compared to control. Distortion of the anterior spiracle and papillae found on respiratory horns were also observed. The present study suggests that azadirachtin hampers the development rate of M. scalaris by reducing the insect population and causing several scanning electron microscopic changes in the puparia of the insect.
Highlights
Megaselia scalaris (Loew), scuttle fly or humpbacked fly, is a cosmopolitan insect with forensically importance (Disney 1994, Campobasso et al 2004, Reibe and Madea 2010)
The present study suggests that azadirachtin hampers the development rate of M. scalaris by reducing the insect population and causing several scanning electron microscopic changes in the puparia of the insect
The results showed that, azadirachtin have toxicity against the 1st instar larvae of M. scalaris. azadirachtin increased larval mortality and inhibited ecdysis
Summary
Megaselia scalaris (Loew), scuttle fly or humpbacked fly, is a cosmopolitan insect with forensically importance (Disney 1994, Campobasso et al 2004, Reibe and Madea 2010). It has a medical importance as a cause humans myiasis (Hira et al 2004, Mazayad and Rifaat 2005, Wakid 2008, Francesconi and Lupi 2012); vector of pathogens (Disney 2008) and contaminant of food products (Nickolls and Disney 2001, Brown and Oliver 2007). Botanical insecticides may serve as alternatives to synthetic chemicals to develop safer control agents of M
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