<p><strong>ROLE OF DIFFERENT TRICHOME STYLE IN THE RESISTANCE OF <em>LYCOPERSICON HIRSUTUM</em></strong> <strong>GENOTYPES TO<em> TUTA ABSOLUTA </em>(MEYRICK)<em> </em>(LEPIDOPTERA: GELECHIIDAE)<em> </em></strong></p>

Abstract

The tomato leaf miner (TLM), Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae), is one of the major pests that attacks commercial tomato. TLM is becoming resistant to many of the pesticides used in the tomato fields. A potential alternative method of control is host plant resistance, which may be mediated by glandular trichomes. We studied glandular and non-glandular trichomes potentially related to tomato resistance of nine tomato genotypes (Lycopersicon hirsutum Humb &amp; Bonpl), extensively cultivated in western Iran. The antixenosis and/or antibiosis effect of the genotypes Mobil, Falat 3, Cal J N3, Dehghan, Super Strain B, Río Grande, King Ston, Early Urbana and Peto Mech were evaluated under greenhouse conditions (25 ± 1°C, 65 ± 5% R.H., photoperiod of L16: D8 h). TLM elicited the lowest egg-laying response on Peto Mech, Río Grande and King Ston; and the highest one on Dehghan. King Ston and Mobil allowed the lowest and highest larvae density on the leaves, respectively. The highest preference was observed on Mobil and the lowest one on Río Grande and King Ston. Moreover, trichome type and density of the assayed genotypes appeared to be related to TLM population density: the most infested genotype (Mobil and Cal J N3) displayed the lowest IV and VI trichome style ranks of leaf blade, vein and domatia (glandular trichomes). Significant negative relations were found between egg and larvae density with leaf I style trichome; and also larvae and adult density with IV and V style trichome. Finally, this preliminary study screened two genotypes (Río Grande and King Ston) quite promising for developing resistance programs in western Iran against TLM.

Comparison of life‐history traits and oviposition preferences of Tuta absoluta for 12 common tomato varieties in Burkina Faso

“…They generally lay their eggs on the underside of the apical leaves because of their low calcium content (Proffit et al ., 2011; Cherif et al ., 2013). The number of eggs they lay are negatively correlated with the presence of compounds such as α‐pinene, β‐pinene, myrcene and limonene (Yarou et al ., 2017), trichome style I on the leaves (Khederi et al ., 2014), heptadecane (Suinaga et al ., 1999), and zingiberene (Azevedo et al ., 2003; Lima et al ., 2015). The density and diversity of glandular and nonglandular trichomes may also impact oviposition site preferences (Khederi et al ., 2014).…”

A review of Tuta absoluta (Lepidoptera: Gelechiidae) host plants and their impact on management strategies

“…In Lycopersicon hirsutum, the increase of glandular trichome density, especially the abundance of 2-TD, was linked with the reduction of the larval development rate and survival of T. absoluta (Leite et al, 1999a;Leite et al, 1999b;Leite et al, 2001). Khederi et al (2014) found that, under greenhouse conditions, the most infested tomato genotypes (Mobil and Cal J N3) displayed the lowest IV and VI trichome style ranks of leaf blade, vein and domatia (glandular trichomes). De Oliveira et al (2012) confirmed that genotypes with higher densities of glandular trichomes had higher resistance than the susceptible controls, with the strain BPX-367D-238-02 being particularly notable in its resistance.…”

“…However, many other studies showed differences among the tested cultivars (Table 2). Susceptible tomato cultivars tested under laboratory or field conditions were characterized by a high number of mined (with or without larvae) leaves, stems or fruits, as well as a better suitability for egg-laying (Oliveira et al, 2009;Cherif et al, 2013;Khederi et al, 2014;Darbain et al, 2016;Sohrabi et al, 2016a;Sohrabi et al, 2016b;Allache et al, 2017;Ghaderi et al, 2017). Tomato cultivar 'Bravo' is commonly classified as one of the most susceptible cultivars, and was shown to be a better host plant than cultivar 'Tex 317': the latter led to a longer development time and a lower emergence rate (Silva et al, 2015).…”

“…Tuta absoluta cultivar resistance is likely associated with the diversity and abundance of glandular trichomes (Campos et al, 2009;Khederi et al, 2014;Shahbaz et al, 2017). The length and density of glandular trichomes are negatively correlated with T. absoluta damage (Darbain et al, 2016).…”

Combining Host Plant Resistance, Selective Insecticides, and Biological Control Agents for Integrated Management of Tuta absoluta

“…In other studies, the insecticide thiacloprid (Calypso 480 SC ® -Bayer crop science, Leverkusen, Germany) was the least compatible with the zoophytophagous predator Macrolophus pygmaeus Rambur (Heteroptera: Miridae) [23]. Also, plant resistance using a high trichome density mechanism was found to reduce T. absoluta population density in some tomato cultivars tested for resistance [24,25]. Furthermore, tomato cultivars with high levels of Zingiberene were found to confer resistance to T. absoluta [26].…”