Abstract
Various autodissemination devices, baited with Lurem-TR and methyl anthranilate, were compared for their effective control of Bean flower thrips (BFT) on cowpea crops. The BFT density in treatment plots with semiochemical-baited autodissemination devices was significantly different during the two evaluation seasons (P < 0.001). In the first season, plots treated with the fungus-free device recorded the lowest BFT density (12.1 ± 1.0 thrips), while those treated with the autodissemination baited with Lurem-TR recorded the highest BFT density (19.1 ± 1.5 thrips), which was significantly different from plots treated with the device baited with methyl anthranilate (16.4 ± 1.3 thrips). The same scenario was observed in the second season, corresponding to high infestation season, where the autodissemination devices baited with Lurem-TR and methyl anthranilate and the fungus-free device recorded 59.9 ± 3.5, 48.4 ± 3.5 and 27.6 ± 4.3 thrips, respectively. In all autoinoculation devices, at least 45% of M. anisopliae conidia remained viable 12–15 days post-exposure. No significant difference in M. anisopliae conidial persistence and acquisition was found between the two contamination devices baited with both semiochemicals. This study has demonstrated that methyl anthranilate could be used in autodissemination, as well as Lurem-TR, to control BFT.
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