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

We assessed the reproductive responses of adult female lphiseius degenerans and Neoseiulus teke to increasing density of three stages of their prey, Mononychellus tanajoa, on cassava leaf discs under laboratory conditions. The oviposition rates increased with number of prey consumed per predator per day with a maximum of approximately two eggs per day for/. degenerans and four eggs per day for N. teke. The oviposition rate of N. teke was higher when consuming eggs than other prey stages. Neoseiulus teke was more efficient than I. degenerans in converting consumed prey into egg production. The data were adequately described by simple mathematical models.

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“…The results of this study agree well with those reported by Badii and McMurtry (1988), Santos (1975) and Hayes (1988) using leaf discs.…”

Section: Discussionsupporting

confidence: 83%

Reproductive responses of Iphiseius degenerans and Neoseiulus teke (Acari: Phytoseiidae) to changes in the density of the cassava green mite, Mononychellus tanajoa (Acari: Tetranychidae)

Nwilene

Nachman

1996

Exp Appl Acarol

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“…Sabelis (1985) reported that temperature has a substantial effect on the rate of oviposition through changes in the duration of oviposition period. According to Hays (1988), a substantial decrease in fecundity from 29.3 to 6.2 eggs/female was observed with increasing temperature from 25 to 26.5°C. The cause of higher differences in fecundities remains unexplained, but it might be due to the fact that the studies were conducted under different climatic conditions, different strains of the predator were used and different amounts and varieties of food were available to the predatory mites.…”

Section: Discussionmentioning

confidence: 96%

Seasonal population dynamics of Typhlodromus pyri Scheuten (Acari, Phytoseiidae) in apple orchards in the region Meckenheim

Khan

Fent

2004

J Pest Sci

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Typhlodromus pyri Scheuten (Acari, Phytoseiidae) has been reported as the most important predator of the European red mite, Panonychus ulmi (Koch) (Acari, Tetranychidae) in apple culture. However, biological data on T. pyri was insufficient on important parameters like seasonal population dynamics and within-tree and on-leaf distribution in apple orchards in the region of Meckenheim, Germany. The purpose of the present work was, therefore, to obtain experimental data on these parameters of T. pyri from 2000 to 2002 in the apple orchards in this region. The results showed that overwintered females of T. pyri reactivate and start laying eggs between late March and early April. The mean daily number of the different stages of T. pyri per leaf peaked in July each year, where it ranged between 0.92-1.68 eggs, 0.81-1.41 nymphs, 0.64-1.32 females and 0.37-0.52 males. A significantly higher number of T. pyri individuals congregated in the bottom layer of trees (0.34-0.64 individuals/leaf) than in the middle and top layers (0.23-0.38 and 0.12-0.23 individuals/leaf, respectively). We found that 91.4-94.1% of the total eggs, 89.6-91.7% larvae, 73.0-76.5% nymphs, 60.5-64.6% adult females and 52.6-55.9% adult males concentrated their activities in the inner area of the leaf surface. More than 50% of the predatory mites congregated in the bottom layer in winter. Mean total density of the over-

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“…The reason was that the females which fed on C. ribis had a relatively shorter oviposition period and longer preoviposition period. The prolongation of preoviposition period and reduction of total fecundity were also noted by Herbert (i 956, 1961) and Hayes (1988) in T. pyri females with a small supply of prey. However, in assessing individual females of both groups a negative correlation between total fecundity and duration of preoviposition period was not found.…”

Section: Parameters Of Reproductionmentioning

confidence: 85%

“…Temperature has a substantial effect on the rate of oviposition through changes in the duration of oviposition period, whilst total fecundity remains constant within a wide range of temperatures (Sabelis, 1985). According to Hayes (1988), optimal temperature for fecundity in T. pyri is between 20 and 25°C, at which mean fecundity was up to 29.3 eggs. He found a substantial decrease in fecundity at 26.5°C (6.2 eggs per female).…”

Section: Parameters Of Reproductionmentioning

confidence: 99%

Characteristics of development and reproduction in Typhlodromus pyri on Tetranychus urticae and Cecidophyopsis ribis. I. Overwintered females

Zemek

1993

Exp Appl Acarol

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Zemek, R., 1993, Characteristics of development and reproduction in 7)~phlodromus pyri on Tetranythus urticae and Cecidophyopsis ribis. I. Overwintered females. Exp. Appl. Acarol., 17:405-421.The results of a study of bionomic parameters in overwintered temales of'l}phlodronmspyri Scheuten under constant laboratory conditions ( 18_+1 °C. RH 75%, ! 8L:6D) are described. The predatory mites were fed two prey species, the two-spotted spider mite, Tetranychus urticae Koch ,and the eriophyid gall mite, Cecidophyopsis ribis (Westwood). The results indicate that 7" pyri females survive and reproduce on C. ribis as well as on ~t: urticae. However, the average fecundity of females feeding on C. ribis was lower (13.79 eggs) compared with that of females ted T. urticae (29 eggs). The length of preoviposition period varied greatly (8 to 96 days), the number of ovipositing females increasing at a statistically significant rate on T. urticae. Differences in the mean duration of postoviposition period (35.27 and 52.50 days) and longevity in the laboratou, (97.82 and 116.04 days) were not statistically significant. Accumulation of metabolites in the alimentaay canal was noted in some females of T. ILvri.

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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

Cited by 15 publications

References 12 publications

Reproductive responses of Iphiseius degenerans and Neoseiulus teke (Acari: Phytoseiidae) to changes in the density of the cassava green mite, Mononychellus tanajoa (Acari: Tetranychidae)

Reproductive responses of Iphiseius degenerans and Neoseiulus teke (Acari: Phytoseiidae) to changes in the density of the cassava green mite, Mononychellus tanajoa (Acari: Tetranychidae)

Seasonal population dynamics of Typhlodromus pyri Scheuten (Acari, Phytoseiidae) in apple orchards in the region Meckenheim

Characteristics of development and reproduction in Typhlodromus pyri on Tetranychus urticae and Cecidophyopsis ribis. I. Overwintered females

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