scholarly journals Sublethal Effects of Atropa belladonna Herbal Extract on Biological Performance of the Two-Spotted Spider Mite Tetranychus urticae Koch (Acari: Tetranychidae)

2018 ◽  
Vol 10 (7) ◽  
pp. 230
Author(s):  
Ayad Alsendi ◽  
Mohammadreza Havasi ◽  
Niloufar Sangak Sani Bozhgani
Keyword(s):  
Tetranychus Urticae ◽  
Spider Mite ◽  
Herbal Extract ◽  
Control Treatment ◽  
Intrinsic Rate Of Increase ◽  
Atropa Belladonna ◽  
Net Reproductive Rate ◽  
Rate Of Increase ◽  
Two Spotted Spider Mite ◽  
Tetranychus Urticae Koch

The two-spotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae) is one of the most important pests of agricultural products. Using chemical pesticides is one of the main methods for its management. Due to undesirable effects of synthetic pesticides, this research was conducted to achieve alternative safe compounds. In this study sublethal effect of Atropa belladonna herbal extract including LC10, LC20, LC30 and distilled water were evaluated on biological parameters (such as r, λ, GRR, R0 and T) of T. urticae. The experiments were done under laboratory condition at 25±2 °C, 60±5% RH, and a photoperiod of 16:8 (L: D) hours. The crude data were analyzed based on age-stage, two-sex life table analysis. The results indicated significant reduction in female’s duration of maturation, oviposition period and total fecundity by increasing examined dose. The highest and lowest values of the net reproductive rate (R0) were obtained 38.41 and 18.08 offspring/individual in control and LC30, respectively. The maximum values of intrinsic rate of increase (r) was 0.2201 day-1that occurred on control treatment while the minimum values was obtained 0.1937 day-1 in LC30 concentration. Finite rate of increase (λ) had significantly descended with concentration enhancing from LC20 to LC30, compared with the control. The results demonstrated that Atropa belladonna herbal extract could be incorporated in integrated pest management (IPM) programs of T. urticae.

scholarly journals Resistance of New Strawberry Genotypes to the Two-Spotted Spider Mite (Acari: Tetranychidae)

2017 ◽  
Vol 9 (8) ◽  
pp. 119
Author(s):  
Fernanda De Cássia Neves Esteca ◽  
Camila Do Nascimento Dainese ◽  
Luis Rodolfo Rodrigues ◽  
André Luiz Lourenção ◽  
Francisco Antonio Passos ◽  
...  
Keyword(s):  
Spider Mite ◽  
Intrinsic Rate ◽  
Reproductive Rate ◽  
Intrinsic Rate Of Increase ◽  
Net Reproductive Rate ◽  
Artificial Infestation ◽  
Rate Of Increase ◽  
Two Spotted Spider Mite ◽  
Tetranychus Urticae Koch ◽  
Moderately Resistant

The two-spotted spider mite, Tetranychus urticae Koch, is one of the main strawberry pests in Brazil and many other countries. The objective of this study was to compare the resistance of eight strawberry genotypes (‘Albion’, ‘IAC Guarani’, ‘IAC Princesa Isabel’, ‘Oso Grande’, IAC T-0104, IAC 12, IAC 4 and IAC 1.13) to the two-spotted spider mite, by assessing injury level, biological parameters and host preference of the mite. To facilitate the interpretation of the results, leaf trichomes of each genotype were quantified. Thirty days after the artificial infestation of the genotypes with the mite, IAC T-0104, IAC 12 and ‘IAC Princesa Isabel’ showed the lowest injury levels. ‘IAC Princesa Isabel’, IAC 4 and IAC T-0104 were distinguished from other genotypes by the highest mean generation time (T) of the mite, while ‘IAC Guarani’ was distinguished by the lowest T value. Significantly lower values of intrinsic rate of increase (rm), finite rate of increase (λ) and net reproductive rate (Ro) were determined on ‘IAC Princesa Isabel’ and IAC 1.13. The mite showed preference for ‘IAC Guarani’, as inferred by the larger number of females when offered the chance to select the detached host leaflets. Trichome density was highest on IAC 1.13 and lowest on IAC T-0104, IAC 12, ‘Albion’ and ‘Oso Grande’. The results suggested that ‘IAC Princesa Isabel’, IAC T-0104 and IAC 12 are resistant, IAC 4 and IAC 1.13 are moderately resistant, and ‘IAC Guarani’, ‘Oso Grande’ and ‘Albion’ are susceptible to the mite.

scholarly journals Effects of B-azolemiteacrylic on life-history traits and demographic parameters of two-spotted spider mite, Tetranychus urticae (Acari: Tetranychidae)

2021 ◽  
Author(s):  
Suqin Shang ◽  
Yun Chang ◽  
Wei-Zhen Li ◽  
Wang Chang-Qing ◽  
Nie Peng-Cheng
Keyword(s):  
Tetranychus Urticae ◽  
Spider Mite ◽  
Sublethal Effects ◽  
Oviposition Period ◽  
Population Doubling ◽  
Intrinsic Rate Of Increase ◽  
Population Doubling Time ◽  
Developmental Duration ◽  
Rate Of Increase ◽  
Two Spotted Spider Mite

AbstractThe present study was conducted to evaluate sublethal effects of B-azolemiteacrylic on the two-spotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae). Female adults of T. urticae were exposed to LC10 and LC30 of the acaricide, and the effects on treated females and their offspring were evaluated. The results showed that the fecundity of F0 female adults treated with LC10 and LC30 of B-azolemiteacrylic was reduced by 30.9 and 39.2%, respectively. Longevity and oviposition period of the females were significantly reduced as well. The developmental duration of egg and deutonymph stage of the F1 generation were not significantly different from that of the control. The protonymph stage after LC30 treatment lasted significantly longer, whereas the larva, deutonymph and female stage were significantly shorter than the control. The oviposition period of the F1 generation was significantly shortened, the fecundity of each female decreased significantly, and the ratio of female-to-male was reduced too. Moreover, the average generation period of T. urticae after LC10 and LC30 treatments was shorter than that of the control, and the net production rate (R0), intrinsic rate of increase (rm) and finite rate of increase (λ) were all reduced by 33.3, 7.5 and 1.9% (LC10 treatment) and by 51.3, 14.8 and 3.6% (LC30 treatment), respectively. The population doubling time was prolonged by 7.5 and 14.8% after LC10 and LC30 treatments, respectively, compared with the control. These results indicate that B-azolemiteacrylic may effectively inhibit the development rate of the F0 and F1 populations of T. urticae, which will help design integrated strategies for the comprehensive control of T. urticae and rational use of pesticides in the field.

scholarly journals Comparative life table analysis of Tetranychus urticae Koch (Acari: Tetranychidae) on ten rose cultivars

Acarologia ◽  
2017 ◽  
Vol 57 (3) ◽  
pp. 607-616
Author(s):  
Ali Golizadeh ◽  
Samira Ghavidel ◽  
Jabraeil Razmjou ◽  
Syed Ali Asghar Fathi ◽  
Mahdi Hassanpour
Keyword(s):  
Population Growth ◽  
Tetranychus Urticae ◽  
Orange Juice ◽  
Growth Parameters ◽  
Intrinsic Rate Of Increase ◽  
Net Reproductive Rate ◽  
Cool Water ◽  
Rate Of Increase ◽  
Population Growth Parameters ◽  
Tetranychus Urticae Koch

Life history parameters of plant feeders are useful tools to evaluate resistance or susceptibility of host plants including different cultivars. This study compared population growth parameters of Tetranychus urticae Koch on 10 rose cultivars, including Bella Vita, Cool Water, Dolce Vita, Maroussia, Orange Juice, Pink Promise, Roulette, Tea, Valentine, and Persian yellow in laboratory conditions at 24+/-1°C, 65+/-5% relative humidity, and a photoperiod of 16:8 (L:D) h. The results revealed that mite survival rate varied from 66.5% on Bella Vita to 85.9% on Persian yellow. The immature development time was different among the tested rose cultivars and ranged from 9.35 days on Orange Juice to 12.30 days on Bella Vita. The highest fecundity rate was recorded on Pink Promise. Consequently, population growth parameters were also significantly affected. The lowest intrinsic rate of increase (rm) was recorded on Roulette and this parameter was relatively higher on Cool Water, Orange Juice, and Persian yellow. In addition, the highest net reproductive rate (R0) was observed on Pink Promise, which was significantly higher than Roulette, Tea, and Valentine cultivars. The longest mean generation time (T) was calculated on Roulette and the shortest on Cool Water, Tea, and Orange Juice. The lowest performance of the two-spotted mite on Roulette could indicate that this is a suitable cultivar against mite infestation. Differences in mite susceptibility of tested rose cultivars here highlighted have the potential to be used for integrated pest management of T. urticae in ornamental rosa cultivations.

scholarly journals Effects of local isolates of Beauveria bassiana (Balsamo) Vuillemin on the two-spotted spider mite, Tetranychus urticae (Koch) (Acari: Tetranychidae)

2021 ◽  
Vol 31 (1) ◽  
Author(s):  
Cenk Yucel
Keyword(s):  
Tetranychus Urticae ◽  
Beauveria Bassiana ◽  
Spider Mite ◽  
Lethal Effect ◽  
Probit Analysis ◽  
Plant Feeding ◽  
Wide Range ◽  
Two Spotted Spider Mite ◽  
Short Time ◽  
Tetranychus Urticae Koch

Abstract Background The two-spotted spider mite, Tetranychus urticae (Koch) (Acari: Tetranychidae), is a widely distributed plant-feeding pest that causes significant yield losses in a wide range of crops. Newly developed or improved environmentally friendly biocontrol agents serve as an alternative to traditional pest control tools. Experiment of the effects of 2 local fungal isolates of Beauveria bassiana (BGF14 and BCA32) was carried out against T. urticae under laboratory conditions. Results Both tested isolates had lethal effect in a short time after application, and this effect increased as time progressed. BGF14 and BCA32 isolates caused T. urticae mortality rates ranging from 25.88 to 61.92 and 32.36 to 62.03% when applied at the concentrations between 1×105 and 1×108 conidia/ml, respectively. According to the Probit analysis performed on the effect of fungi on T. urticae adults, the LC50 values of BGF14 and BCA32 isolates on the 7th day after inoculation were 2.6×106 and 6.3×104 conidia/ml, respectively, and the LT50 values for both fungi applied at a concentration of 108 conidia/ml were 2.14 and 2.23 days, respectively. Conclusions The 2 isolates of B. bassiana (BGF14 and BCA32) had the potentials to suppress T. urticae population and can be recommended as promising biocontrol agent candidates for control of T. urticae.

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