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29 September 2020 Resistance of Four Rose Varieties to Tetranychus urticae (Acari: Tetranychidae) under Greenhouse Conditions
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Abstract

The rose varieties (Rosa spp.; Rosaceae), widely used to decorate urban landscapes, are susceptible to attacks by arthropod pests. The twospotted spider mite Tetranychus urticae Koch (Acari: Tetranychidae) is one of the most economically important pests in roses. The study proposed to evaluate the resistance mechanisms (antixenosis, antibiosis, and tolerance) of 4 rose varieties (‘Ojo de Toro,' ‘Samuray,' ‘Virginia,’ and ‘Keiro') to twospotted spider mite under greenhouse conditions. The antixenosis was evaluated by non-preference of oviposition, and through the number of larvae, nymphs, and adults of twospotted spider mite; antibiosis by the growth rate (r); tolerance by chlorophyll loss and leaf damage index. Twospotted spider mite showed no preference to oviposit on plants of the Samuray variety (3 eggs per leaflet). Larvae, nymphs, and adults showed no preference to feed on Ojo de Toro and Samuray varieties. Twospotted spider mite recorded the lowest values in r (0.2047 d-1) and the percentage of chlorophyll loss (15.64%) in the Samuray variety. The damage caused by twospotted spider mite in the 4 rose varieties was similar. The Samuray variety was the most resistant to twospotted spider mite, whereas the most susceptible varieties were Keiro and Virginia.

The rose, Rosa hybrida L. (Rosaceae), are decorative plants of urban landscapes throughout the world (Jaskiewicz 2006; Bidarnamani et al. 2015). In Mexico, the production of the rose represents an annual economic benefit of around 2,163,000 Mexican pesos. In 2018, exports reached a value of US $6,555,000. The USA is the largest consumer, importing 99.41% of the production in Mexico (SAGARPA-SIAP 2019). The quality of the flowers of these ornamental plants is susceptible to attack by pests and diseases, principally because the pests reduce the plant growth (Golizadeh 2017). The twospotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae), is one of the most economically important pests in roses in both greenhouse and open field conditions, feeding on more than 1,100 plant species (Grbic et al. 2011; Khajehali et al. 2011). Control of the twospotted spider mite mostly has depended on the use of insecticides and acaricide chemicals, but due to the pest's short life cycle, abundant progeny, and arrenotic reproduction, it can quickly develop resistance to these compounds (Van Leeuwen et al. 2010). This reason brought about the study of host plants resistant to attack by these phytophagous mites. The resistance of a plant to a pest can be through various mechanisms such as antixenosis, antibiosis, tolerance, or combinations of these. Antixenosis is the non-preference of a phytophagous pest to a resistant plant, and directly affects both feeding and oviposition of the pest. Antibiosis occurs when the phytophagous pest is negatively affected, especially in its biology, by secondary metabolites produced by resistant host plants. Tolerance is a polygenic trait that allows a plant to resist or recover from damage caused by a phytophagous pest (Smith 2005; Smith & Clement 2012).

Host plants with resistance to twospotted spider mite attack have been recorded in crops such as soybeans, Glycine max (L.) Merrill (Fabaceae) (Sedaratian et al. 2009); melon, Cucumis melo L. (Cucurbitaceae) (Shoorooei et al. 2013); beans, Phaseolus vulgaris L. (Fabaceae) (Shoorooei et al. 2018); rose, Rosa spp. (Rosaceae), among others (Golizadeh et al. 2017). The intrinsic growth rate (rm) has been used as an indicator to assess the level of resistance of plants to attack of T. urticae in experiments performed under laboratory conditions (Sedaratian et al. 2009; Golizadeh et al. 2017; Shoorooei et al. 2018). This study proposed to evaluate the resistance mechanisms of 4 rose varieties to the attack of T. urticae under greenhouse conditions.

A twospotted spider mite colony was started with biological material obtained from the Laboratory of Acarology, Parasitology Department, Antonio Narro Agrarian Autonomous University, Saltillo, Couahuila, Mexico. Twospotted spider mite populations increased on bean plants that were maintained under laboratory conditions at 27 ± 2 °C, 60 ± 15% RH, and a 16:8 h (L: D) photoperiod.

Four rose varieties were used: ‘Ojo de Toro,' ‘Virginia,' ‘Samuray,' and ‘Keiro.’ Ojo de Toro, Samuray, and Keiro are new varieties introduced and cultivated in Mexico, and Virginia is a variety known for its resistance to the attack of T. urticae (Flores-Canales et al. 2011). Ten 1-yr-old plants per variety were used, which were planted at a distance of 10 cm in a greenhouse. The plants were fertilized with NPK once a wk for 8 consecutive wk, and mono-ammonium phosphate (12-61-0) (36.10 g), ammonium nitrate (12-00-46) (35.16 g), and urea (46-00-00) (13.75 g) diluted in 20 L of water. From the ninth wk, fertilization was suspended to avoid the possible effect of macroelements on twospotted spider mite (Ribeiro et al. 2012; Alizade et al. 2016). Twenty-five d before the infestation of the plants with twospotted spider mite, the insecticide Dibrol® 2.5 EC was applied (1 mL of the product with L-1 of water, to eliminate the presence of other phytophagous pests. The study was conducted at 28 ± 4 °C and RH of 60 ± 15%. Seven d after the fertilization was suspended, each plant was infested randomly with 100 newly mated T. urticae adult females. Seven d after the infestation, a random sampling of the twospotted spider mite population was carried out on 9 leaflets per variety. The samples were processed in the laboratory, and after counting the twospotted spider mites, the leaflets were destroyed.

Antixenosis was evaluated by the non-preference of twospotted spider mite. The number of eggs, larvae, nymphs, and adults were counted under a stereo microscope (UNICO Stereo & Zoom Microscopes ZM180, Dayton, New Jersey, USA).

The growth rate was used as the parameter to determine the antibiosis.

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Where Nt corresponds to the number of individuals at time t (d), and N0 is the number of individuals at time 0 (initial cohort = 100 T. urticae adult females) (Birch 1948; Simoni et al. 2018).

Tolerance was determined in 2 ways: (1) leaf damage index, which was estimated visually on each leaflet by an arbitrary scale proposed by Nachman and Zemek (2002), where 0 = 0% damage (no feeding damage) and 5 = 81% to 100% feeding damage (a dense mark or wilt per whole bean disc consumption), and (2) through the estimation of chlorophyll loss, expressed as a percentage (Smith 2005). A Spad 502 chlorophyll meter (Konica Minolta, Osaka, Japan) was used to measure the amount of chlorophyll: (SPADC – SPADT) / SPADC) × 100, where SPADC represents the reading of the SPAD in the control plant (without twospotted spider mite) and SPADT is the reading of the SPAD in the treated plant (infested with twospotted spider mite).

Normality and homogeneity of variance tests were used to apply the analysis of variance (ANOVA) of 1-way or its equivalent (the Kruskal-Wallis test). The significant differences were analyzed with the Tukey or Nemenyi multiple comparison tests (P ≤ 0.05) (Wheater & Cook 2005; Pohlert 2014). Significance tests for the parameter among rose varieties was conducted using the jackknife procedure (Meyer et al. 1986). The R-project program (R Core Team 2018) was used for all analyses.

Antixenosis: The number of eggs laid, larvae, nymphs, and adults of twospotted spider mite were significantly different in the 4 rose varieties (Ojo de Toro – χ2 = 12.341; df = 3; P = 0.0063; Samuray – χ2 = 12.944; df = 3; P = 0.0047; Keiro – χ2 = 24.733; df = 3; P = 1.756e-06; Virginia – χ2 = 21.026; df = 3; P = 0.0001), respectively. Oviposition non-preference was observed on leaflets of the Samuray variety (Table 1), and the number of larvae, nymphs, and adults were fewer in Ojo de Toro and Samuray varieties.

Antibiosis: Twospotted spider mite went through their development until becoming adults in the 4 rose varieties. There were significant differences among varieties for growth rate (r) (χ2 = 20.274; df = 3; P = 0.0001). The highest (median) r of the twospotted spider mite was observed in the Keiro variety (0.3765), followed by the varieties Virginia (0.3289), Ojo de Toro (0.2440), and Samuray (0.2047) (Fig. 1). These values suggest that the Samuray variety showed the greatest resistance to the growing population of twospotted spider mite.

Tolerance: The damage caused by the twospotted spider mite was similar in the 4 varieties (χ2 = 5.82; df = 3; P = 0.1207). In 7 d of interaction between the varieties and twospotted spider mite, the leaf damage index medians were 1 for the Ojo de Toro, Samuray, and Keiro varieties, and 2 for Virginia variety.

Chlorophyll loss percentage in the 4 varieties was significantly different from the control plants (F = 21.749; df = 3, 32; P = 7.25e-08). The greatest chlorophyll loss was recorded in the Virginia variety (x̄ ± SD = 45.50 ± 4.74%), followed by Keiro (x̄ ± SD = 30.44 ± 12.09%), Ojo de Toro (x̄ ± SD = 23.74 ± 7.25%), and Samuray (x̄ ± SD = 15.64 ± 6.59%) (Fig. 2). Therefore, Virginia was the most susceptible and Samuray the most resistant.

The effect of antixenosis was observed in the Samuray variety. The phytochemical (alkaloids, flavonoids, terpenes, and phenols) and morphological (trichomes, leaf thickness) factors of the plants adversely affect the behavior of the arthropods, leading them to late acceptance and possible rejection of a plant as a host (Smith 2005; Smith & Clement 2012). Flores-Canales et al. (2011) documented differences in the content of terpenes, essential oils, nitrogen, and in the leaf thickness of 13 rose varieties. These factors influence the suitability of plants to be used as hosts of different arthropods (Smith 2005; Flores-Canales et al. 2011, 2014; Golizadeh 2016; Golizadeh et al. 2017). The allelo-chemicals (alkaloids, flavonoids, terpenes, and phenols) produced by many plants and stored in cell walls of the leaves deter feeding and oviposition of arthropods (Smith 2005). The diversity and quantity of these metabolites in plants that affect the herbivory (e.g., oviposition, mate selection, and feeding) generally are due to their genetics and environmental influence (Städler 2002; Chapman 2003; Smith & Clement 2012).

Table 1.

Descriptive statistics of 4 stages of Tetranychus urticae development on 4 rose varieties.

img-z2-15_404.gif

In this study, the antibiosis of rose varieties on the twospotted spider mite was indicated by the growth rate (r). The highest values of r were found in the Keiro and Virginia varieties due to the higher survival of a significant number of eggs, larvae, nymphs, and adults; therefore, the probability of passing from one development stage to another is higher. Whereas in Ojo de Toro and Samuray varieties, r values were low due to lower fecundity (antixenosis); consequently, a smaller number of larvae, nymphs, and adults were recorded. The differences among r values of twospotted spider mite on rose varieties could be attributed to the levels of secondary metabolite produced by each of them, making them susceptible or resistant (Flores-Canales et al. 2011, 2014; Golizadeh 2016; Golizadeh et al. 2017). Flores-Canales et al. (2014) demonstrated that terpenes and tannins (secondary metabolites) extracted from rose varieties negatively impacted twospotted spider mite populations.

Chlorophyll loss in plant tissues (especially in leaves) is an indicator that allows one to determine the tolerance of a plant to attack by phytophagous pests (Smith 2005). Chlorophyll values in the 4 rose varieties were different; the Samuray variety showed the lowest values (resistant), whereas the Virginia variety showed the highest (susceptible) (Fig. 2). The Kruskal-Wallis test did not show significant differences by the leaf damage index in the 4 varieties studied, but the most considerable damage was observed in the Virginia variety (median = 2). These results are consistent with the values of chlorophyll loss caused by the feeding of twospotted spider mite (Fig. 2). In varieties Samuray, Ojo de Toro, and Keiro, the values of leaf damage index were equal (median = 1), indicating only initial damage in the leaflet due to the feeding of the larvae, nymphs, and adults of twospotted spider mite after 7 d of interaction. In the Virginia variety, feeding patches tended to coalesce, but only two-thirds of the leaflet was affected. The Samuray variety was the one that showed the least loss of chlorophyll and damage; therefore, it was the one that most tolerated the twospotted spider mite attack, showing excellent response to the injury caused by the mite. This response does not cause the evolution of resistance in target pest populations by involving only one plant response to phytophagous pests; therefore, an integrated pest management scheme may be included (Peterson et al. 2017).

In conclusion, the data obtained allow us to attribute the resistance of the rose varieties to attack of the twospotted spider mite to antibiosis, antixenosis, and tolerance. The Samuray variety was the most resistant to the mite, and Keiro and Virginia varieties were the most susceptible. These results are promising; however, further research on the morphology, detection, and quantification of secondary metabolites produced by the roses is required to be able to correlate them with their antibiotic, antixenotic, and tolerance effects to twospotted spider mite.

Fig. 1.

Box-plot comparing growth rate (r) of Tetranychus urticae on 4 rose varieties. Varieties with different letters were significantly different (Nemenyi test, P < 0.05).

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Fig. 2.

Average (± SE) of the percentage of chlorophyll loss caused by the feeding of Tetranychus urticae. Varieties with different letters were significantly different (Tukey test, P < 0.05).

img-z3-6_404.jpg

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Julio C. Chacón-Hernández, Ernesto Cerna-Chávez, Luis A. Aguirre-Uribe, Yisa M. Ochoa-Fuentes, Carlos E. Ail-Catzim, and Jerónimo Landeros-Flores "Resistance of Four Rose Varieties to Tetranychus urticae (Acari: Tetranychidae) under Greenhouse Conditions," Florida Entomologist 103(3), 404-407, (29 September 2020). https://doi.org/10.1653/024.103.0315
Published: 29 September 2020
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