A laboratory study on the predatory mite,Typhlodromus pyri (Acarina: Phytoseiidae). II The effect of temperature and prey consumption on the numerical reponse of adult females

1988 ◽  
Vol 30 (1) ◽  
pp. 13-24 ◽  
Author(s):  
A. J. Hayes
Keyword(s):  
Laboratory Study ◽  
Predatory Mite ◽  
Prey Consumption ◽  
Typhlodromus Pyri ◽  
Effect Of Temperature ◽  
Adult Females

scholarly journals Influence of leaf trichomes on predatory mite (Typhlodromus pyri) abundance in grape varieties

2008 ◽  
Vol 45 (3-4) ◽  
pp. 111-122 ◽  
Author(s):  
R. Loughner ◽  
K. Goldman ◽  
G. Loeb ◽  
J. Nyrop
Keyword(s):  
Predatory Mite ◽  
Typhlodromus Pyri ◽  
Leaf Trichomes ◽  
Grape Varieties

Effects of short-term heat stress on the development and reproduction of predatory mite Neoseiulus barkeri (Acari, Phytoseiidae)

2021 ◽  
Vol 26 (4) ◽  
pp. 713-723
Author(s):  
Wei Zhen Li ◽  
Hao Long Li ◽  
Zi Kun Guo ◽  
Su Qin Shang
Keyword(s):  
Heat Stress ◽  
Life Span ◽  
Treatment Time ◽  
Predatory Mite ◽  
Immature Stage ◽  
Oviposition Period ◽  
Hatching Rate ◽  
Short Term ◽  
Developmental Duration ◽  
Adult Females

The predatory mite Neoseiulus barkeri (Acari: Phytoseiidae), which is one of the best natural enemies, has been used as a biological control agent against multiple insect pests, such as spider mite, Tetranychus urticae and thrips. Its growth and development were affected by the environmental temperature changes. This study was conducted to evaluate the hatching rate of the eggs and the immature developmental times of N. barkeri after incubation of the eggs under heat stress at 38, 40 and 42℃, 85% ± 5% RH and a 16h:8h light: dark (L:D) photoperiod for 2, 4 and 6h. After adult females emerged, they were treated under the same conditions again, and the parameters such as oviposition period, fecundity and female longevity were observed. The results showed that with the increase of the temperature and the extension of the duration of the heat stress, the hatching rate was lower. The eggs treated at 42℃ for 2h or more could not hatch, and the developmental duration of each immature stage showed a trend of decreasing at first and then increasing. The fastest development was observed after incubation of eggs at 40℃ for 2h, and the shortest developmental duration was 4.60d. Under the condition of 38℃, the oviposition period and life span of adult females were shortened with the extension of treatment time, and the fecundity decreased at first and then increased. At 40℃, the fecundity, oviposition period and longevity of adult females showed a trend of gradual increase with the extension of treatment time. The shortest oviposition period, the lowest fecundity and the shortest life span of adult females were 12.14d, 18.92 eggs and 16.65d, respectively after incubation of eggs at 40℃, for 2h. Therefore, the short-term heat stress had a significant effect on the hatching rate and the duration of the immature stage, and also had a negative effect on the fecundity, oviposition period and longevity of adult females. In rearing and field release, heat stress should be avoided as much as possible to achieve the best predation and control effect of N. barkeri.

The predatory mite Typhlodromus pyri (Acari: Phytoseiidae) as a biocontrol agent of Eriophyes pyri (Acari: Eriophyidae) on pear

Biologia ◽  
2011 ◽  
Vol 66 (1) ◽  
Author(s):  
Ján Praslička ◽  
Janka Schlarmannová ◽  
Barbora Matejovičová ◽  
Ján Tancík
Keyword(s):  
Biological Activity ◽  
Untreated Control ◽  
Biocontrol Agent ◽  
Predatory Mite ◽  
Typhlodromus Pyri ◽  
The Other ◽  
Control Group ◽  
Untreated Control Group ◽  
Other Hand

AbstractThe effectiveness of the predatory mite Typhlodromus pyri and of an application of Polysulphide-Ca was compared during 2006–2008. The experiment showed differences in infestation levels of pear leaves caused by Eriophyes pyri. The highest percentage of leaves with symptoms was found in untreated control group (⊘ 20.9%); the lowest percentage was found in plots treated with T. pyri (⊘ 3.7%); and a slightly higher percentage was found in plots treated with Polysulphide-Ca (⊘ 8.6%). During 2006–2008 the percentage of leaves with symptoms was approximately the same only in the untreated control plots (from 20.3% to 21.5%). The percentage of leaves with characteristic symptoms in plots treated with T. pyri decreased from 5.5% in 2006 to 4.3% in 2007, and to 1.3% in 2008. On the other hand, the percentage of leaves with symptoms in plots treated with Polysulphide-Ca increased from 5.5% in 2006 to 8.5% in 2007, and to 11.8% in 2008. The intensity of symptoms on infested leaves was also different depending on treatments and years. The average biological activity was 82.4% in plots receiving releases of T. pyri and 58.8% in plots treated with Polysulphide-Ca.

Overwintering Females and the Number of Generations of Typhlodromus (T.) pyri Scheuten (Acarina: Phytoseiidae) in Nova Scotia

1962 ◽  
Vol 94 (3) ◽  
pp. 233-242 ◽  
Author(s):  
H. J. Herbert
Keyword(s):  
Life History ◽  
Nova Scotia ◽  
Laboratory Study ◽  
Life Histories ◽  
Prey Species ◽  
Typhlodromus Pyri ◽  
Predacious Mite ◽  
Predominant Species ◽  
Laboratory Conditions ◽  
Wide Range

Typhlodromus pyri Scheuten (= T. tiliae Oudms.) is the predominant species of predacious mite on apples in Nova Scotia. It feeds on a wide range of prey species (Herbert, 1959). Chant (1960) investigated the life-history and habits of this species in southeastern England and Herbert (1956) studied its life-history under controlled laboratory conditions. A knowledge of the life-histories of various components of the fauna is basic to an evaluation of predation; therefore, a study of the life-history and habits of T. pyri in the field was undertaken. This was supplemented by a laboratory study in which an attempt was made to duplicate field temperarures. The results of these studies are presented here.

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