THE INFLUENCE OF PREY DENSITY, RELATIVE HUMIDITY, AND STARVATION ON THE PREDACIOUS BEHAVIOR OF PHYTOSEIULUS PERSIMILIS ATHIAS-HENRIOT (ACARINA: PHYTOSEIIDAE)

1966 ◽  
Vol 44 (3) ◽  
pp. 483-491 ◽  
Author(s):  
Hans Mori ◽  
D. A. Chant
Keyword(s):  
Relative Humidity ◽  
Functional Response ◽  
Tetranychus Urticae ◽  
Prey Density ◽  
Prey Species ◽  
Phytoseiulus Persimilis ◽  
Predacious Mite ◽  
Egg Consumption ◽  
Tetranychus Urticae Koch

The functional response of the predacious mite Phytoseiulus persimilis Athias-Henriot was tested at various densities of Tetranychus urticae (Koch), a prey species, and at several levels of humidity and hunger. The consumption of adult prey per predator rose at first with increasing prey density, but significantly decreased at high densities. This phenomenon was caused by an increase in abandonment of captures resulting from disturbance by other prey at high prey densities. Egg consumption by the predator increased with prey density.Prey consumption was greater at low than at high humidities. A significant increase in the rate of repeat feeding was found at higher levels of predator hunger, but the differences in consumption of prey between the three levels of hunger were not significant.

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

THE INFLUENCE OF HUMIDITY ON THE ACTIVITY OF PHYTOSEIULUS PERSIMILIS ATHIAS-HENRIOT AND ITS PREY, TETRANYCHUS URTICAE (C. L. KOCH) (ACARINA: PHYTOSEIIDAE, TETRANYCHIDAE)

1966 ◽  
Vol 44 (5) ◽  
pp. 863-871 ◽  
Author(s):  
Hans Mori ◽  
D. A. Chant
Keyword(s):  
Tetranychus Urticae ◽  
Phytoseiulus Persimilis ◽  
High Water ◽  
Predacious Mite ◽  
Tetranychus Urticae Koch

The activity of the predacious mite Phytoseiulus persimilis Athias-Henriot and its prey, Tetranychus urticae (Koch), was studied at several humidity levels. The prey, but not the predator, continuously avoided high humidities. Both species were more active in low humidities than in high. Water available for drinking was important to the survival of P. persimilis.

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.

THE FUNCTIONAL RESPONSE OF PHYTOSEIULUS PERSIMILIS (ACARINA: PHYTOSEIIDAE) TO VARIOUS DENSITIES OF TETRANYCHUS URTICAE (ACARINA: TETRANYCHIDAE)

1979 ◽  
Vol 111 (1) ◽  
pp. 7-10 ◽  
Author(s):  
P. Everson
Keyword(s):  
Functional Response ◽  
Tetranychus Urticae ◽  
Adult Female ◽  
Response Curve ◽  
Prey Density ◽  
Handling Time ◽  
Phytoseiulus Persimilis ◽  
Activity Level ◽  
Artificial Substrates ◽  
Successful Search

AbstractThe functional response of the predacious mite Phytoseiulus persimilis Athias-Henriot to increases in the prey density of adult female Tetranychus urticae Koch was examined. Previous studies on artificial substrates have described the functional response curve of P. persimilis to adult female prey as dome-shaped, because as prey density increased the predator was disturbed by prey activity.An experiment to determine the effect of artificial and natural substrates on the activity level of T. urticae was conducted. T. urticae showed a significant increase in activity on artificial substrates of plastic and waterproof paper compared with a substrate of excised bean leaf (Phaseolus vulgaris L.). Since prey activity was significantly influenced by substrate, the functional response of P. persimilis to adult female T. urticae was re-examined. P. persimilis exposed to various densities of T. urticae on excised bean leaf disks (5 cm2) showed a functional response curve having a curvilinear rise to a plateau as prey densities increased from 0.2 to 10.0 prey/cm2.The functional response curve predicted by Holling’s disk equation did not differ significantly from the observed functional response curve.The rate of successful search and the handling time predicted by the disk equation were 0.194 and 10.34 h respectively.

Relative Toxicity of Parathion and Kelthane to the Predacious Mite Phytoseiulus persimilis Athias-Henriot and its Prey, Tetranychus urticae Koch, (Acarina: Phytoseiidae, Tetranychidae) in the Laboratory

1965 ◽  
Vol 97 (2) ◽  
pp. 172-176 ◽  
Author(s):  
D. C. Herne ◽  
D. A. Chant
Keyword(s):  
Tetranychus Urticae ◽  
Phytoseiulus Persimilis ◽  
Test Method ◽  
Similar Relationship ◽  
Relative Toxicity ◽  
Predacious Mite ◽  
Spray Tower ◽  
Tetranychus Urticae Koch

AbstractThe relative toxicity of Kelthane (1,1-bis (p-chlorophenyl) -2,2,2-trichloroethanol), and parathion to Phytoseiulus persimilis Athias-Henriot and its prey, Tetranychus urticae K. (= telarius (L.)), was determined using a Potter Spray Tower. Parathion was found to be far more toxic to P. persimilis than was Kelthane. The LD50 values for Kelthane were 0.051% and 0.29% for T. urticae and P. persimilis respectively, and for parathion were 0.050% and 0.0044% respectively. The LD95 values bore a similar relationship to each other. The two materials were equally toxic to T. urticae. Therefore, use of Kelthane rather than parathion in an environment where P. persimilis and T. urticae were interacting would favour the beneficial species. The statistical aspects of the test method are discussed.

ВИРОЩУВАННЯ ХИЖОГО КЛІЩА ФІТОСЕЙУЛЮСА

2021 ◽  
Vol 1 (23) ◽  
pp. 28-33
Author(s):  
О. Д. Молчанова ◽  
В. П. Баркар ◽  
О. Б. Трібунцова
Keyword(s):  
Tetranychus Urticae ◽  
Phytoseiulus Persimilis ◽  
Tetranychus Urticae Koch

Світова практика свідчить про наявність значного попиту на таких агентів біологічної боротьби як хижі кліщі. Їх широко використовують у тепличних господарствах для захисту овочевих та декоративних культур. При застосуванні в захищеному ґрунті в якості одного з найбільш ефективних засобів боротьби зі звичайним павутинним кліщем (Tetranychus urticae Koch, 1836) добре зарекомендував себе хижий кліщ фітосейулюс (Phytoseiulus persimilis Athias-Henriot, 1957). Автооорами розроблено спосіб розведення фітосейулюса. Технологічний цикл включає напрацювання природного корму фітосейулюса – звичайного павутинного кліща та безпосередньо хижака. Створено пристрій для вирощування хижого кліща фітосейулюса, що складається з двох боксів. В кожному боксі модуля для розведення фітосейулюса можливе автономне вирощування хижака. Кожен бокс розподілений перфорованими полицями на три однакових частини. Пристрій оснащений системою примусової вентиляції, що попереджає злипання та загнивання рослин, в яких мешкають кліщі. Принцип роботи модуля базується на негативному геотаксисі хижака. По мірі знищення павутинного кліща, субстрат переміщують на нижні полиці, а хижак мігрує в верхні відсіки де знаходяться свіжіші рослини з павутинним кліщем. Вивчено процес вирощування хижака в модулі для масового розведення фітосейулюса. Вирощування кліща здійснювали за температури повітря +26 – 28 °С та відносної вологості 70 – 80 %. Визначена динаміка збирання та кількість отриманого хижого кліща. Для збирання використовували ємності, які закріплені зверху боксів. Ємності для збирання міняли з інтервалом в 1,5 години. Найбільша кількість кліща зібрано на 6 годину збирання та складала в середньому 44,0 тис. з двох ємностей. Загальна кількість зібраного кліща за 12 годин складала 225,5 тис. Визначено, що в пристрої залишалися яйця фітосейулюса. В результаті, технологічні втрати складали 9 – 11 %. Тому після збирання здійснювали додаткове завантаження на верхню полицю зрізаних рослин з павутинним кліщем та через три доби здійснювали повторне збирання кліща. Використовуючи додаткове годування та збирання хижого кліща за цикл вирощування було отримано майже 242,2 тис. особин фітосейулюса у рухомих стадіях розвитку.

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.  

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