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153 results for “Tetranychus urticae”
Figure 1 in Effects of temperature on a Chinese population ofAmblyseius andersoni (Acari: Phytoseiidae) fed with Tetranychus urticae
Figure 1 Age-specific survival rate (lx) and age-specific fecundity ratem(x) curves of female Ambl- yseius andersoni at five different temperatures. —▲— Age-specific survival rate (lx). —■— Age- specific fecundity rate (mx).
Figure 2 in Effect of the essential oil from the latex of the fruit Mangifera indica L. on Tetranychus urticae Koch (Acari, Tetranychidae)
Figure 2 Egg laying preference (mean ± SE) ofTetranychus urticaeexposed toMangifera indica oils and selected constituents for 48 hours. *significantly different (p<0.05).
Figure 3 in Suitability of different pollen grains and Tetranychus urticae as food for the predatory mite, Amblyseius swirskii (Acari: Phytoseiidae)
Figure 3. Pollen shape of eight different plant pollens prepared using a Scanning Electron Microscopy (SEM).
Figure 2 in Suitability of different pollen grains and Tetranychus urticae as food for the predatory mite, Amblyseius swirskii (Acari: Phytoseiidae)
Figure 2. Age-specific survivorship (lx), and age-stage-specific fecundity (fxj) of Ambluseius swirskii fed on Tetranychus urticae and seven different plant pollen grains.
Figure 1 in Biological effects of three bacterial species on Tetranychus urticae (Acari: Tetranychidae) infesting eggplant under laboratory and greenhouse conditions
Figure 1 Pictures of dead mite individuals after spray with the pathogenic bacteria: A – Acinetobacter sp.; B –B. subtilis and C –B. qassimus
Figure 2 in Silicon derivatives induced host plant resistance against Tetranychus urticae (Acari: Tetranychidae) in eggplants farms
Figure 2. (A) Silicon leaf, total protein and phenol contents, (B) Activity of POD, CAT, and PPO of S. melongena- treated plants. Means followed by the same letter are not significantly different using Tukey's HSD Test at P <0.05. T1 = Control, T2 = OSAB 2 mL L−1, T3= OSAB 4 mL L−1, T4= Silica K 2 mL L−1, and T5 = Silica K 4 mL L−1.
Figure 1 in Silicon derivatives induced host plant resistance against Tetranychus urticae (Acari: Tetranychidae) in eggplants farms
Figure 1. Mean number ± SE of the different stages of T. urticae on S. melongena leaves 10, 30 and 50 days after spraying (DAS). Means followed by the same letter are not significantly different using Tukey's HSD at P <0.05. T1 = Control, T2 = OSAB 2 mL L−1, T3 = OSAB 4 mL L−1, T4 = Silica K 2 mL L−1, and T5 = Silica K 4 mL L−1.
Figure 1 in Alfalfa responses to drought, salinity, and herbivory by Tetranychus urticae (Acari: Tetranychidae) and performance of the pest on water-stressed plants
Figure 1. Effects of drought stress on proline content of alfalfa plants before and after Tetranychus urticae feeding. Within each column mean (± SE) followed by the same letter(s) are not significantly different. Capital letters show the effect of drought.
Figure 2 in Alfalfa responses to drought, salinity, and herbivory by Tetranychus urticae (Acari: Tetranychidae) and performance of the pest on water-stressed plants
Figure 2. Effects of salinity stress on proline content of alfalfa plants before and after Tetranychus urticae feeding. Within each column mean (± SE) followed by the same letter(s) are not significantly different. Capital letters show the effect of salinity.
Figure 1 in Life table parameters of Tetranychus urticae (Trombidiformes: Tetranychidae) on four strawberry cultivars
Figure 1. Age-stage survival rate (Sxj) of Tetranychus urticae on four strawberry cultivars.
Augmentation and conservation biological control of Tetranychus urticae on hops in Ohio
<p class="MsoNormal"></p> <p class="MsoNormal">The twospotted spider mite, <em>Tetranychus urticae </em>Koch<em> </em>(Acari: Tetranychidae),<em> </em>is a key pest on hops grown in the Midwestern USA, where hop production is a new industry, and little research has been done on the management of <em>T. urticae</em>.<span> </span>In 2016 and 2017, we conducted an experiment to determine the efficacy of augmentative biological control of <em>T. urticae</em> populations on the cultivar 'Cascade' at four hop yards. <span> </span>In both years, treatments compared <em>Neoseiulus fallacis</em> Garman (Acari: Phytoseiidae), released at a high rate and a low rate, and an untreated control, with eight replicates in 2016 and 17 replicates in 2017. <span> </span>Additional treatments in 2016 evaluated <em>Galendromus</em> <em>occidentalis </em>Nesbitt<em> </em>(Acari: Phytoseiidae) released at a high and a low rate. The target low rate in both years was one predator per ten <em>T. urticae</em>. The target high rate was one predator per five <em>T. urticae</em> in 2016, and one predator per two <em>T. urticae</em> in 2017. <span> </span>When weekly monitoring showed that the population reached an action threshold of one <em>T. urticae</em> per ten leaves, predatory mites were released. <span> </span>If the <em>T. urticae</em> population continued to increase, a second release was made. <span> </span>By the time of harvest, the cumulative number of mite-days for <em>T. urticae</em> did not differ significantly among treatments in either year.<span> </span>Hop yields showed a significant treatment effect in 2016, with higher yield where the high rate of <em>G. occidentalis</em> was released than in other treatments, but yields did not show any significant treatment effect in 2017.<span> </span>In 2017, we also conducted an exclusion experiment at four hop yards in Ohio, to determine the services provided by predators already present in hop yards, as well as the ability of the combination of predatory mites, <em>N. fallacis</em> and <em>Neoseiulus californicus </em><span>McGregor</span><em> </em>(Acari: Phytoseiidae), to suppress <em>T. urticae </em>by augmentative releases at three different predator to prey ratios: zero to ten, one to ten, and two to ten.<span> </span>Samples were paired; one leaf was covered with a fine mesh bag and one leaf was left uncovered, in each of 50 replicates.<span> </span>After two weeks, the average number of <em>T. urticae</em> motiles on the open leaves that received zero phytoseiids was significantly less than the starting number of ten, suggesting that ambient predation is capable of suppressing <em>T. urticae</em> populations.<span> </span>The average number of <em>T. urticae</em> motiles on the enclosed leaves that received two phytoseiids was also significantly less than the starting number of ten, while the average number of <em>T. urticae</em> motiles on the enclosed leaf that received one phytoseiid was not, showing that a ratio of one phytoseiid to five <em>T. urticae</em> is effective at reducing <em>T. urticae</em> populations.<span> </span>Our experiments showed that when <em>T. urticae </em><span>is </span>found at low to moderate densities, naturally occurring predators are able to suppress their populations in Ohio hop yards.<span> </span>Augmentation using phytoseiid mites did not have a consistent beneficial effect on yields.<span> </span>Given that naturally occurring predators are important in the suppression of <em>T. urticae</em> populations, future studies thus might concentrate on conservation biological control.</p> <p> </p>
Figure 6 in Evaluation of geostatistical method and hybrid Artificial Neural Network with imperialist competitive algorithm for predicting distribution pattern of Tetranychus urticae (Acari: Tetranychidae) in cucumber field of Behbahan, Iran
Figure 6. Motion of colonies toward their relevant imperialist (AtashpazGargari 2009).
Figure 4 in Evaluation of geostatistical method and hybrid Artificial Neural Network with imperialist competitive algorithm for predicting distribution pattern of Tetranychus urticae (Acari: Tetranychidae) in cucumber field of Behbahan, Iran
Figure 4. Flowchart of Imperialist Competitive Algorithm (AtashpazGargari 2009).
Figure 7 in Evaluation of geostatistical method and hybrid Artificial Neural Network with imperialist competitive algorithm for predicting distribution pattern of Tetranychus urticae (Acari: Tetranychidae) in cucumber field of Behbahan, Iran
Figure 7. Distribution of T. urticae in different stages of sampling.
Figure 2 in A population growth model of Tetranychus urticae Koch (Acari: Tetranychidae)
Figure 2. Growth of total population of T. urticae on two bean fitted to logistic curve.
Figure 1 in A population growth model of Tetranychus urticae Koch (Acari: Tetranychidae)
Figure 1. Population fluctuation of total population of T. urticae on two bean fields in 2016.
Figure 1 in Effect of the essential oil from the latex of the fruit Mangifera indica L. on Tetranychus urticae Koch (Acari, Tetranychidae)
Figure 1 Feeding preference (mean ± SE) ofTetranychus urticaeexposed toMangifera indicaoils
Figure 4 in Suitability of different pollen grains and Tetranychus urticae as food for the predatory mite, Amblyseius swirskii (Acari: Phytoseiidae)
Figure 4. Exine patterns of four plant pollens prepared using a Scanning Electron Microscopy (SEM).
FIGURE 1 in The Impact Of Cucumber Nitrogen Nutrition On Life History Traits Of Tetranychus Urticae (Koch) (Acari: Tetranychidae)
FIGURE 1: Age specific survival rate (lx) and fecundity (mx) of Tetranychus urticae on four nitrogen treatments
FIGURE 1 in Population Growth Parameters Of The Two-Spotted Spider Mite, Tetranychus Urticae, On Three Peach Varieties In Iran
FIGURE 1: Survival rate for life stages of T. urticae, from egg to adult emergence, on three peach varieties, Redtap, G.H.Hale and Kardi, under 27 ± 1 °C, 50 ± 10 % humidity and photoperiod of 12:12 (L:D) conditions.
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