Integration of Certain Acaricides with Phytoseiulus persimilis to Control Tetranychus urticae on Beans Plants, and Their Sub-Lethal Effect on Its Life-Table Parameters تکامل المبيدات الأکاروسية مع Phytoseiulus persimilis للتحکم في Tetranychus urticae على نباتات الفاصوليا ، وتأثيرها شبه المميت على معلمات جدول حياته

Plants in nature are constantly exposed to various stresses resulting from fluctuating environmental conditions which adversely affect their growth and development and may affect the performance of herbivores feeding on them. Drought and salinity are the most serious problems of agriculture due to climatic changes. According to global warming and drying of Urmia salty lake in Northwestern Iran which could result in salinization of agricultural lands nearby, the focus of this study was to examine the effect of two above mentioned stresses on a host plant and its pest population. Three levels of salinity (50 (low), 100 (intermediate) and 150 (high) mM NaCl) and water deficit (40–50% the amount of water given to control plants) were induced to common bean (Phaseolus vulgaris) as stress factors and the following characteristics were measured: fresh and dry weight, leaf area, chlorophyll, carotenoid, proline and protein contents and CAT, APX and GPX enzyme activities. The life table parameters of two-spotted spider mite, Tetranychus urticae Koch, reared on stress-induced plants were measured and compared with control. The high saline condition caused plant defoliation and was deleted from results. The low saline condition caused an increase in fresh weight and decrease in chlorophyll and protein contents of plant. Intermediate saline condition caused an increase in APX and CAT enzyme activities and decrease of dry weight, chlorophyll, protein and proline contents. Drought condition caused an increase of APX and GPX enzyme activities and proline content and decrease of dry weight and chlorophyll content. Analysis of life table data of T. urticae showed a significant decrease of net reproductive rate (R0), mean generation time (T) and gross reproductive rate (GRR) of mites reared on plants under both of stresses. The intrinsic rate of increase (r) and finite rate of increase (λ) decreased significantly only for mites reared on plants under intermediate saline condition.

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The Effects of Clofentezine on Life-table Parameters in Two-spotted Spider Mite Tetranychus urticae

Experimental and Applied Acarology ◽

10.1023/b:appa.0000006541.68245.94 ◽

2003 ◽

Vol 30 (4) ◽

pp. 249-263 ◽

Cited By ~ 29

Author(s):

Dejan Marcic

Keyword(s):

Life Table ◽

Tetranychus Urticae ◽

Spider Mite ◽

Life Table Parameters ◽

Two Spotted Spider Mite

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Group-rearing did not affect the life table and predation rate of Phytoseiulus persimilis (Acari: Phytoseiidae) fed on Tetranychus urticae

Systematic and Applied Acarology ◽

10.11158/saa.22.10.11 ◽

2017 ◽

Vol 22 (10) ◽

pp. 1698 ◽

Cited By ~ 2

Author(s):

Sahar Saemi ◽

Hasan Rahmani ◽

Aurang Kavosi ◽

Hsin Chi

Keyword(s):

Life Table ◽

Tetranychus Urticae ◽

Phytoseiulus Persimilis ◽

Intrinsic Rate ◽

Predation Rate ◽

Reproductive Rate ◽

Intrinsic Rate Of Increase ◽

Net Reproductive Rate ◽

Rate Of Increase ◽

Negative Effect

To better understand the effect of individual- and group-rearing conditions on predator performance, we studied the life table and predation rate of the predatory mite, Phytoseiulus persimilis Athias-Henriot, after the mites had been individually- or group-reared on two-spotted spider mites, Tetranychus urticae, eggs at 25±1°C, 65±5% RH and a photoperiod of 16: 8 (L:D) h. The net reproductive rate (R0), intrinsic rate of increase (r), net predation rate (C0), finite predation rate (ω) in the individually-reared predators were 40.61 offspring, 0.2594 d-1, 437.3 T. urticae eggs, and 4.8668 preys/d, respectively. Similar values were obtained when the predators were reared in groups (R0 = 43.10 offspring, r = 0.2837 d-1, C0 = 420.9 T. urticae eggs, and ω = 5.9054 preys/d). Mean adult longevities were 28.42 and 25.29 d for group-reared male and female predators, respectively; these values were significantly shorter than those of individual-reared mites (49.87 d for male and 36 d for female). Our results showed that P. persimilis mites could be group-reared in biological control programs without negative effect on their growth and predation potential.

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Effect of induced resistance in bean plants on Tetranychus urticae life table parameters

Systematic and Applied Acarology ◽

10.11158/saa.23.8.12 ◽

2018 ◽

Vol 23 (8) ◽

pp. 1627

Author(s):

Atefeh Dahmardeh ◽

Malihe Latifi ◽

Rohollah Saberi Riseh

Keyword(s):

Life Table ◽

Tetranychus Urticae ◽

Intrinsic Rate ◽

Reproductive Rate ◽

Intrinsic Rate Of Increase ◽

Life Table Parameters ◽

Acid Complex ◽

Net Reproductive Rate ◽

Bean Plants ◽

Rate Of Increase

In this study the effects of soil application of potassium phosphite, amino acid complex, and biolog siderophoric on the life table parameters of Tetranychus urticae have been investigated on bean plants, under laboratory conditions. The results revealed significant differences in the total developmental times, oviposition periods, and fecundity of T. urticae among the treatments. The shortest total developmental time and longevity was observed in biolog siderophoric treatment. The intrinsic rate of increase, the net reproductive rate, the finite rate of increase and the mean generation times of T. urticae were remarkably different among the treatments and lower than in the control. The lowest values of these parameters were observed in the biolog siderophoric treatment, which suggests that this inducer could be employed toward a sustainable management of T. urticae.

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