Bottom-up effects of irrigation, fertilization and plant resistance on Tuta absoluta: implications for Integrated Pest Management

2018 ◽  
Vol 92 (4) ◽  
pp. 1359-1370 ◽  
Author(s):  
Peng Han ◽  
Nicolas Desneux ◽  
Christine Becker ◽  
Romain Larbat ◽  
Jacques Le Bot ◽  
...  
2019 ◽  
Vol 92 (4) ◽  
pp. 1371-1371 ◽  
Author(s):  
Peng Han ◽  
Nicolas Desneux ◽  
Christine Becker ◽  
Romain Larbat ◽  
Jacques Le Bot ◽  
...  

Insects ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 274
Author(s):  
Nomi Sarmah ◽  
Athanasios Kaldis ◽  
Clauvis Nji Tizi Taning ◽  
Dionysios Perdikis ◽  
Guy Smagghe ◽  
...  

RNAi-mediated insect pest management has recently shown promising results against the most serious pest of tomato, the tomato leafminer, Tuta absoluta. This study aimed to investigate whether dsRNA (dsTa-αCOP) designed to target the T. absoluta-αCOP gene could cause adverse effects to its biocontrol agent, the mirid predator, Nesidiocoris tenuis. Oral exposure of N. tenuis to dsRNA (dsNt-αCOP) designed to target N. tenuis-αCOP resulted in a 61%, 67% and 55% reduction in its transcript level in comparison to the sucrose, dsGFP and dsTa-αCOP treatments, respectively. In addition, significantly higher mortality of 57% was recorded in dsNt-αCOP-treated N. tenuis when compared to the sucrose (7%), dsGFP (10%) and dsTa-αCOP (10%) treatments. Moreover, the predation rate of ~33–39 Ephestia kuehniella eggs per N. tenuis adult dramatically reduced to almost half in the surviving dsNt-αCOP-treated N. tenuis. This worst-case exposure scenario confirmed for the first time that the RNAi machinery is functional in this species and that the risk of exposure through the oral route is possible. In contrast, dsTa-αCOP did not cause any sub-lethal effects to N. tenuis upon oral exposure. Oral exposure of T. absoluta to dsTa-αCOP resulted in 50% mortality. In the context of a biosafety risk assessment of RNAi-mediated insect management, investigating the effects on non-target organisms is essential in order to include this method as part of an integrated pest management strategy. Based on our laboratory assays, RNAi-mediated control is compatible with the biological control of T. absoluta by its natural enemy N. tenuis, adding the RNAi approach in the armoire of integrated pest management of T. absoluta.


2019 ◽  
Vol 33 (3) ◽  
pp. 264-270
Author(s):  
V Sridhar ◽  
S Onkara naik ◽  
K.S Nitin ◽  
R Ashokan ◽  
P Swathi ◽  
...  

2021 ◽  
Vol 49 (4) ◽  
pp. 12543
Author(s):  
Roxana CICEOI ◽  
Mihaela IORDĂCHESCU ◽  
Anca A. UDRIȘTE ◽  
Liliana A. BĂDULESCU

For integrated pest management (IPM) and organic farming, breeding resistant varieties is one of the most eco-friendly approaches, that goes along botanicals and other different cultural practices, as the use of companion plants. Among the many pest species that invaded the whole world in the last decades, one of the most frightening is the tomato leafminer, Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae), a devastating pest of cultivated tomato worldwide. Tomato is one of the most important agricultural commodities, including the main mean of subsistence in many countries from Africa and middle East. As chemical pesticides failed to control de pest spread and led to many reports of resistant populations, alternative methods for tomato leafminer management must be quickly developed. Many of such alternatives count on a wide range of chemical compounds. The chemical compounds most often responsible for “constitutive resistance”, synthetized by tomato are methyl-ketones (2-tridecanone), sesquiterpenes (zingiberene), and acyl sugars (acylglucose and acylsucrose) while the chemical compounds produced by other plants, used as isolated substances or mixtures, which have antifeedant, growth inhibiting, repellent, and insecticide effects, are azadirachtin, carvacrol, cinnamaldehyde, citronellal, eugenol, linalool, nicotine, pyrethrin, rotenone, thujone, thymol, α-terpineol, 1.8-cineol, etc. Many of them are already commercially available but their efficacy and use differ widely. Therefore, a deeper understanding of the resistance mechanism of solanaceous species related to chemical compounds and substances important for IPM plans developed against T. absoluta is required by the breeding programs.


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