Abstract
The effect of a chitin synthesis inhibitor (Lufenuron) on the antennal segements and their sensilla of cowpea beetle, Callosobruchus maculatus(Fabricius) was studied by using scanning electron microscope. Seven types of sensilla were recognized on both untreated and treated antennae with 9 ppm of lufenuron, including Bohm bristles (BB), two types of sensilla trichodea (ST1, ST2), sensilla chaetica (SC), two types of sensilla basiconica (SB 1, SB2) and grooved peg (GP). The functions of these sensilla were discussed in relation to their position on the antenna. Significant difference in lengths of most segments of the antennae between untreated and treated beetles was observed. A significant difference in lengths and diameters of nearly all types of sensilla was recorded. The highest increase in length of sensilla was noticed for the sensilla chaetica followed by sensilla trichodea. These types are used by insects as mechanosensory, sex pheromone and gustatory receptors that help them to make a decision to select their food and oviposition sites.
Highlights
Callosobruchus maculatus is a cosmopolitan pest of stored grain legumes (Fabaceae) of the genus Vigna (Cope and Fox, 2003)
The morphology and distribution of various types of antennal sensilla in untreated and F1 adults of Callosobruchus maculatus resulting from adults treated with 9 ppm Lufenuron were studied by using scanning electron microscope
The antennae of Callosobruchus maculatus is serrate in shape
Summary
Callosobruchus maculatus is a cosmopolitan pest of stored grain legumes (Fabaceae) of the genus Vigna (Cope and Fox, 2003). As a consequence of infestation, seed lots become warm resulting in quality loss and mould growth (Rees, 2004). In contrast to traditional insecticides are generally non to slightly toxic to higher animals. They inhibit the synthesis of chitin of insects by causing abnormal endocuticular deposition and absorptive moulting (Post and Vincent, 1973). Lufenuron (chitin synthesis inhibitor) is one of the most newly introduced synthetic insect growth regulators. It is used for controlling lepidopterous and Coleopterous larvae on cotton, maize, vegetables, citrus white fly and rust mites on citrus fruits
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