scholarly journals Functional response of Cydnodromus picanus (Acari: Phytoseiidae) on two-spotted spider mite, Tetranychus urticae (Acari: Tetranychidae)

2017 ◽  
Vol 66 (2) ◽  
Author(s):  
Víctor Ernesto Tello Mercado ◽  
Miguel Esteban Zarzar Maza ◽  
Angélica María Suarez Pantoja
Keyword(s):  
Functional Response ◽  
Tetranychus Urticae ◽  
Handling Time ◽  
Consumption Rates ◽  
65 H ◽  
Two Spotted Spider Mite ◽  
Tetranychus Urticae Koch ◽  
Range Of Variation ◽  
Average Consumption ◽  
Type Ii Functional Response

The functional response of adult females of predatory mite Cydnodromus picanus Ragusa (Acari: Phytoseiidae) was evaluated at different egg densities (5, 10, 20, 30, 40, 50, 60, 70, 80, 100 and 150 eggs per predator) of Tetranychus urticae Koch (Acari: Tetranychidae), which had 16, 42 and 65 h since oviposition. The experimental design was in a completely randomized blocks with five replicates per treatment. The environmental conditions of the trials were 25±2°C temperature, 50±2% of relative humidity and a photoperiod of 16:8 hours (light: dark). The average consumption rates for the three kinds of prey showed no significant differences (p>0.05) being 20.56±1.02, 18.59±0.79 and 18.38±0.94 prey/predator for eggs of 16, 42 and 65 h age, respectively. Using a logistic regression, a type II functional response on C. picanus females for the three kinds of eggs was determined. The values of response parameters for C. picanus females were as follows: Attack rate (a): 0.055±0.006, 0.076±0.009 and 0.073±0.016; Handling time (Th): 0.684±0.036, 0.894±0.034 and 0.898±0.062; for eggs of 16, 42 and 65 h age, respectively. These values are within the range of variation for different species of phytoseiids. These results suggest that C. picanus could effectively regulate populations of T. urticae in the field.  

THE FUNCTIONAL RESPONSE AND PREY PREFERENCE OF FELTIELLA ACARISUGA (VALLOT) (DIPTERA: CECIDOMYIIDAE) FOR TWO OF ITS PREY: MALE AND FEMALE TWOSPOTTED SPIDER MITES, TETRANYCHUS URTICAE KOCH (ACARI: TETRANYCHIIDAE)

1997 ◽  
Vol 129 (2) ◽  
pp. 221-227 ◽  
Author(s):  
G.P. Opit ◽  
B. Roitberg ◽  
D.R. Gillespie
Keyword(s):  
Functional Response ◽  
Tetranychus Urticae ◽  
Handling Time ◽  
Response Models ◽  
Male And Female ◽  
Functional Response Models ◽  
Prey Handling ◽  
Tetranychus Urticae Koch ◽  
Type Ii Functional Response ◽  
Twospotted Spider

AbstractThe preference of the predatory midge, Feltiella acarisuga (Vallot), for adult male and female twospotted spider mite, Tetranychus urticae Koch, was examined using functional response models. The midge exhibited a type-II functional response to each prey. Handling time was estimated to be much higher for the female mites than for the males (1.52 vs. 0.40 h). Estimated instantaneous search rates for the female and male mites were similar (1.32 vs. 1.28). A preference index of 1.03 was calculated using the ratio of the instantaneous search rates. Feltiella acarisuga was found to exhibit no preference for either female or male mites; when both prey were present in equal numbers, midge larvae killed as many females as males.

Age-Dependent Functional and Numerical Responses of Neoseiulus cucumeris (Acari: Phytoseiidae) on Two-Spotted Spider Mite (Acari: Tetranychidae)

2020 ◽  
Author(s):  
Sajjad Dalir ◽  
Hamidreza Hajiqanbar ◽  
Yaghoub Fathipour ◽  
Mostafa Khanamani
Keyword(s):  
Functional Response ◽  
Middle Ages ◽  
Spider Mite ◽  
Biological Control Agent ◽  
Handling Time ◽  
Control Agent ◽  
Neoseiulus Cucumeris ◽  
Predation Capacity ◽  
Two Spotted Spider Mite ◽  
Tetranychus Urticae Koch

Abstract The age-specific functional and numerical responses of Neoseiulus cucumeris Oudemans (Mesostigmata: Phytoseiidae) on eggs of the two-spotted spider mite, Tetranychus urticae Koch (Prostigmata: Tetranychidae), were assessed in the laboratory using bean leaf discs. Densities of 2, 4, 8, 16, 32, 64, and 128 prey were provided to 4- (protonymph), 6- (deutonymph), 8-, 13-, 18-, 23-, 28-, 33-, and 40-d-old N. cucumeris individuals. The functional response of 28- and 40-d-old N. cucumeris fitted type II, whereas the other ages displayed a type III functional response. The longest handling time observed at the age of 4 d was 0.515 h, whereas the shortest handling time and highest value of maximum attack rate (T/Th) were associated with the age of the 28-d-old treatment (0.261 h and 91.95 prey/d, respectively). The numerical response of N. cucumeris showed a significant increase with increasing prey density, but its rate gradually decreased at higher densities. Therefore, the efficiency of conversion of ingested food was relatively higher at low two-spotted spider mite densities, whereas it was reduced at high two-spotted spider mite densities. The stronger functional response and predation capacity of N. cucumeris on two-spotted spider mite eggs indicated the high potential of this predatory mite as an effective biological control agent against two-spotted spider mite especially at its early and middle ages and also when higher prey densities are present.

Age-specific functional response and predation rate of Amblyseius swirskii (Phytoseiidae) on two-spotted spider mite

2017 ◽  
Vol 22 (2) ◽  
pp. 159 ◽  
Author(s):  
Yaghoub Fathipour ◽  
Maryam Karimi ◽  
Azadeh Farazmand ◽  
Ali Asghar Talebi
Keyword(s):  
Functional Response ◽  
Spider Mite ◽  
Biological Control Agent ◽  
Handling Time ◽  
Predation Rate ◽  
Control Agent ◽  
Type Ii ◽  
Amblyseius Swirskii ◽  
Two Spotted Spider Mite ◽  
Tetranychus Urticae Koch

The lifetime functional response and predation rate of Amblyseius swirskii Athias-Henriot on eggs of the two-spotted spider mite, Tetranychus urticae Koch were determined under laboratory conditions using cucumber leaf discs. Densities of 2, 4, 8, 16, 32, 64 and 128 prey were offered to 3, 4, 5, 6, 7, 12, 17, 22 and 27-day-old A. swirskii individuals. Based on the logistic regression, the functional response of twelve-day-old A. swirskii was type III, while the other ages showed type II. The Rogers model was used to estimate searching efficiency (a) and handling time (Th). The longest handling time (1.387±0.315 h) was observed in the protonymphal stage, while the shortest handling time and highest maximum attack rate (T/Th) were estimated at the age of seven-days (0.396±0.057 h and 60.67 prey/day, respectively). In the functional response experiments, results of the highest prey density used (128 eggs) showed that the highest number of prey consumed by A. swirskii individuals aged twelve and seventeen-days old (35.6 and 43.1 eggs, respectively). It is concluded that A. swirskii could be an efficient biological control agent of T. urticae at the middle-age of its life and at higher prey densities. 

scholarly journals Sublethal effect of Abamectin in the functional response of the predator Phytoseiulus persimilis (Athias-Henriot) on Tetranychus urticae (Koch) (Acari: Phytoseiidae, Tetranychidae)

2019 ◽  
Vol 79 (2) ◽  
pp. 273-277 ◽  
Author(s):  
J. I. Monjarás-Barrera ◽  
J. C. Chacón-Hernández ◽  
E. Cerna-Chávez ◽  
Y. M. Ochoa-Fuentes ◽  
L. A. Aguirre-Uribe ◽  
...  
Keyword(s):  
Functional Response ◽  
Tetranychus Urticae ◽  
Handling Time ◽  
Sublethal Effect ◽  
Phytoseiulus Persimilis ◽  
Biological Behavior ◽  
Search Efficiency ◽  
Type Ii ◽  
Tetranychus Urticae Koch ◽  
Predator Mite

Abstract The biological control used for the control of Tetranychus urticae (Koch) is the predator mite Phytoseiulus persimilis (Athias-Henriot). It is important to the know the effects of acaricides on the biological behavior the Abamectin on the functional response of P. persimilis. The functional response of the predator was of type II exposed to concentration of Abamectin, the functional response parameters: successful attack rate (a’), handling time (Th), search efficiency and the maximum predation theory (T/Th) were affected by the acaricide. The predator spends more time in persecute, dominate, consume and prepair it self to the next searching comparing with the proof subject an the predation ability was affected.

scholarly journals Functional response of Phytoseiulus persimilis Athias-Henriot to Tetranychus urticae Koch: effects of prey life stages and temperature

1970 ◽  
Vol 29 ◽  
pp. 1-8 ◽  
Author(s):  
Md Fazlul Hoque ◽  
Md Wahedul Islam ◽  
M Khalequzzaman
Keyword(s):  
Functional Response ◽  
Tetranychus Urticae ◽  
Adult Female ◽  
Prey Density ◽  
Nonlinear Least Squares ◽  
Handling Time ◽  
Phytoseiulus Persimilis ◽  
Life Stages ◽  
Least Squares Regression ◽  
Tetranychus Urticae Koch

This paper examines the effect of density and temperature on the functional response of adult female Phytoseiulus persimilis to different life stages of the spider mite, Tetranychus urticae. The functional response was determined using functional response assay technique with plant leaf discs an arena. We conducted a logistic regression of the proportion of prey consumed as a function of initial prey density to identify functional response types, and used nonlinear least-squares regression and the random predator equation to estimate attack rates and handling times. In all the cases number of adult male prey attacked by female predator were greater than adult female prey. P. persimilis consumed more eggs and larvae than other stages of prey. Female predator consumed adult prey at each temperature which generally increased with prey density initially but leveled off at higher prey densities. The highest number of eggs, larvae and nymphs consumed by predator in 24 hours was 16.3 ± 0.42, 9.9 ± 0.59 and 9.5 ± 0.40 respectively whereas the highest number of eggs, larvae and nymphs consumed by a single female in 48 hours was 19.5 ± 1.15, 18.6 ± 0.62 and 13.3 ± 0.65 respectively. Handling time generally decreased with temperature whereas successful attack rate increased with temperature except at 30º C. Judging by a/Th values, P. persimilis was most efficient against T. urticae at 30-35ºC, about half as efficient at 25 ºC and performed poorly at 20º C. Again, from a/Th values, P. persimilis was most efficient against T. urticae in egg stage, about half as efficient at larva and nymph stages and performed poorly at adult stage.   Key words: Phytoseiulus persimilis; Tetranychus urticae; functional response; predation; temperature.DOI: http://dx.doi.org/10.3329/ujzru.v29i1.9458 UJZRU 2010; 29(1): 1-8

scholarly journals Age-specific functional response and predation capacity of Phytoseiulus persimilis (Phytoseiidae) on the two-spotted spider mite

Acarologia ◽  
2017 ◽  
Vol 58 (1) ◽  
pp. 31-40
Author(s):  
Yaghoub Fathipour ◽  
Maryam Karimi ◽  
Azadeh Farazmand ◽  
Ali Asghar Talebi
Keyword(s):  
Functional Response ◽  
Spider Mite ◽  
Handling Time ◽  
Phytoseiulus Persimilis ◽  
Predation Rate ◽  
Type Ii ◽  
Predation Capacity ◽  
Old Adult ◽  
Two Spotted Spider Mite ◽  
Tetranychus Urticae Koch

The lifetime-dependent functional response and predation rate of Phytoseiulus persimilis Athias-Henriot on eggs of the two-spotted spider mite, Tetranychus urticae Koch was determined under laboratory conditions using cucumber leaf discs. Densities of 2, 4, 8, 16, 32, 64 and 128 prey were offered to 4 (protonymph), 5 (deutonymph), 6 (1-day-old adult), 10 (5-day-old adult), 15 (10-day-old adult), 20 (15-day-old adult), 25 (20-day-old adult), 30 (25-day-old adult), 35 (30-day-old adult) and 40 (35-day-old adult) P. persimilis individuals. The results of logistic regression analyses showed that on the 15th, 35th and 40th days of predator age, predation rate of T. urticae eggs increased, resulting in the type III functional response, while at the other ages, the functional response was type II. The Rogers model was used to estimate searching efficiency (a) and handling time (Th). The longest handling time was obtained in the protonymphal stage with 2.377 +/- 0.192 h. The shortest handling time and the highest value of estimated maximum attack rate (T/Th) were estimated at the age of 20 days (0.494 +/- 0.009 h and 48.57prey/day). At the highest prey density used (128 eggs), our findings showed that the highest number of prey was eaten by 15, 20, 25 and 30 days old P. persimilis (39.3, 41.7, 39.3 and 38.1 eggs per day, respectively). The results of this study revealed that P. persimilis especially at the middle and late ages has a good predation potential on T. urticae eggs at higher prey densities.

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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