Attraction of female tomato leaf miner, Tuta absoluta (Meyrick, 1917) (Lepidoptera:Gelechiidae) to shared compounds from
- PDF / 616,404 Bytes
- 10 Pages / 547.087 x 737.008 pts Page_size
- 48 Downloads / 212 Views
ORIGINAL ARTICLE
Attraction of female tomato leaf miner, Tuta absoluta (Meyrick, 1917) (Lepidoptera:Gelechiidae) to shared compounds from hosts Davis Msisi & Nicodemus D. Matojo & Fikira Kimbokota
Received: 25 January 2020 / Accepted: 7 September 2020 # Springer Nature B.V. 2020
Abstract Tomato leaf miner, Tuta absoluta is a ravaging pest of tomato in many countries of the world including Tanzania. The pest inflicts substantial damage to tomato crop that causes a huge loss to farmers. This study focused on evaluating potentials of shared volatiles emanated from four hosts of the pest, namely tomato, aubergine, sweet pepper and watermelon in formulating attractant for female T. absoluta. Y-tube olfactometer was used to evaluate attractiveness of leaf volatiles from four hosts and a blend of shared compounds and GC-MS was used to identify volatile constituents of the four hosts. Results indicate that, female T. absoluta were attracted to volatiles of tomato volatiles (χ2 = 4.9, P < 0.05) and repelled by watermelon volatiles (χ2 = 6.4, P < 0.05). We further observed high composition of terpenes in tomatoes (70%) as compared to other hosts, which might have contribute to its observed attraction compared to the other hosts. On the other hand, watermelon was highly constituted by green leaves volatiles (GLVs) which is suggested to account for the observed repellency. Thus, shared compounds that do not contain GLVs significantly attracted female T. absoluta at a dose of 10 μl (χ2 = 8.1, P < 0.05). Our findings have revealed that, compounds shared by hosts attract females T. absoluta. Therefore, results from this study have laid groundwork in the development of attractant for management and monitoring of the pest. D. Msisi : N. D. Matojo : F. Kimbokota (*) University of Dar es Salaam, Mkwawa University College of Education, P.O. Box 2513, Iringa, Tanzania e-mail: [email protected]
Keywords Kairomones . Olfactometer . Shared compounds . Tomatoes . Tuta absoluta . Female attractant
Introduction Tomato leaf miner, Tuta absoluta (Meyrick, 1917) (Lepidoptera: Gelechiidae) is a threat to tomato production worldwide (Roditakis et al. 2015). T. absoluta is reported to originate from South America in the 1980’s (Desneux et al. 2010; Bawin et al. 2016; Fernandez and Montagne 1990; Guedes and Picanço 2012). It became prominent in 2006 after its invasion in Spain (Urbaneja et al. 2007). It then spread to Mediterranean countries, Africa, Middle East and Asia (Urbaneja et al. 2007; Desneux et al. 2010). The pest was reported for the first time in Africa in Tunisia in 2008 (Desneux et al. 2010) and currently is reported in 41 out of 54 African countries (Mansour et al. 2018). T. absoluta is an oligophagous pest that infests a wide range of Solanaceae crops including sweet pepper (Capsicum annuum L.), aubergine (Solanum melongena L.) and potato (Solanum tuberosum L.) (Desneux et al. 2010). Despite its oligophagous nature there is reported evidence that the pest is expanding its host range (Mohamed et al. 2015). T. absoluta has been
Data Loading...
