Population Density and Damage Caused by Two Spotted Spider Mite, Tetranychus urticae Koch on Different Pinto Bean Lines Under Field Conditions

2020 ◽  
Vol 25 (12) ◽  
pp. 2212-2223
Author(s):  
Zarir Saeidi ◽  
Ghobad Babaei ◽  
Foroud Salehi
Keyword(s):  
Population Density ◽  
Grain Yield ◽  
Spider Mite ◽  
Yield Loss ◽  
Leaf Surface ◽  
Field Conditions ◽  
Abaxial Leaf Surface ◽  
Pinto Bean ◽  
On Line ◽  
Two Spotted Spider Mite

In this study, population density and yield loss caused by two-spotted spider mite (TSSM) on eight lines of pinto bean were studied under field conditions during two successive years (2009-2010). The experiment was arranged in completely randomized block design with subdivided plots and four replications in Lordegan fields, Chaharmahal va Bakhtiari province, Iran. The main plots and sub-plots consisted of bean lines and acaricides application, respectively. Population density of TSSM was recorded at weekly intervals, beginning from the seedling stage and continued to harvesting time on different lines. Yield loss caused by the mite on each line, was calculated by subtracting the average yields in sprayed subplots versus unsprayed subplots. For this purpose, 10 plants from each subplot were selected randomly and the yield and yield components including; the number of pods/plant, number of seeds/pod and weight of 100 seeds were recorded. Moreover, the grain yield (kg. ha-1) was determined by harvesting the central area (10 m2) in each subplot. Our results indicated significant differences in TSSM population (eggs, juveniles and adults) among the studied lines. In 2009, the highest number of mite was recorded on line ‘L29’ (120.20 ± 18.79) whereas, the lowest on line ‘L1’ (22.51 ± 4.96 mites/ 2 cm2 of the abaxial leaf surface). Moreover, during 2010, the highest and the lowest population density of the mite were supported by line ‘D3’ (55.53 ± 5.68) and line ‘L1’ (9.33 ± 0.79 mites/ 2 cm2 of the abaxial leaf surface), respectively. Mean yield loss of pinto bean lines due to the mite attack calculated 1460.6 kg. ha-1 (64.1 ± 10.2%) and 1278.7 kg. ha-1 (61.4 ± 8.6%) in 2009 and 2010, respectively. The highest grain yield loss presented by line ‘L1’ (91.1 ± 12.1% and 86.4 ± 8.9%) followed by lines ‘L29’and ‘L30’, whereas, the lowest observed in lines ‘J29’ (41.5 ± 7.7% and 37.5 ± 7.6%) and ‘L19’ (50.7 ± 6.6% and 47.4 ± 5.4% in 2009 and 2010, respectively).

Leaf pubescence and two-spotted spider mite webbing influence phytoseiid behavior and population density

Oecologia ◽  
2001 ◽  
Vol 129 (4) ◽  
pp. 551-560 ◽  
Author(s):  
A. Roda ◽  
J. Nyrop ◽  
G. English-Loeb ◽  
M. Dicke
Keyword(s):  
Population Density ◽  
Spider Mite ◽  
Leaf Pubescence ◽  
Two Spotted Spider Mite

scholarly journals Occurrence of Two-Spotted Spider Mite (Tetranychus urticae Koch) on Potentilla fruticosa Cultivars

2016 ◽  
Vol 24 (2) ◽  
pp. 25-30
Author(s):  
Piotr Szafranek
Keyword(s):  
Tetranychus Urticae ◽  
Spider Mite ◽  
Weather Conditions ◽  
Field Conditions ◽  
Potentilla Fruticosa ◽  
Growing Seasons ◽  
Deciduous Shrubs ◽  
Two Spotted Spider Mite ◽  
Tetranychus Urticae Koch

Abstract Potentilla fruticosa L. (Rosaceae Juss.) is one of the most popular deciduous shrubs cultivated in Poland. Among pests identified so far on P. fruticosa, a serious threat is caused by two-spotted spider mite Tetranychus urticae Koch (Acari: Tetranychidae). During three-year study, the occurrence of two-spotted spider mite T. urticae on four cultivars of P. fruticosa: ‘Goldfinger’, ‘McKay’s White’, ‘Uman’ and ‘Pink Beauty’ grown in field conditions was compared. While conducting experiment, weather conditions were monitored. The number of eggs and motile forms of two-spotted spider mite were recorded separately. The most attractive cultivar to spider mite was ‘Goldfinger’. The largest amount of motile forms of mites and their eggs were found on the leaves of this cultivar in all three years of study. The least number of pests occurred on the cv. ‘Pink Beauty’. However, differences in the abundance of this pest on all studied cultivars were variable during the growing seasons.

THE EFFECT ON THE TWO-SPOTTED SPIDER MITE, TETRANYCHUS URTICAE, OF DICOFOL CONCENTRATION AND DEPOSIT DISTRIBUTION ON THE LEAF SURFACE

1968 ◽  
Vol 100 (7) ◽  
pp. 777-781 ◽  
Author(s):  
R. W. Fisher ◽  
N. G. Morgan
Keyword(s):  
Field Strength ◽  
Tetranychus Urticae ◽  
Adult Female ◽  
Active Ingredient ◽  
Spider Mite ◽  
Leaf Surface ◽  
Egg Laying ◽  
Low Volume ◽  
Two Spotted Spider Mite ◽  
Toxicity Effects

AbstractDicofol was applied to bean leaf discs in various ways. The number of drops per disc, the concentration of dicofol in each drop, and the size of the drops were related to egg laying and mortality of adult female mites placed on the discs. Under the conditions of the experiment, an increase in concentration above normal field strength (0.046% active ingredient) had little effect, even though the deposits were discontinuous and similar to those expected from low-volume spraying. Repellency of dicofol to mites was reaffirmed and toxicity effects were significant when about one-quarter of the leaf surface was covered by deposit.

The Residual Toxicity of Some Newer Acaricides to the Two-Spotted Spider Mite (Acarina: Tetranychidae)

1950 ◽  
Vol 82 (4) ◽  
pp. 73-83 ◽  
Author(s):  
Thomas Armstrong
Keyword(s):  
Spider Mite ◽  
Feeding Habits ◽  
Extended Period ◽  
Field Conditions ◽  
Potential Value ◽  
Systemic Action ◽  
Residual Toxicity ◽  
Two Spotted Spider Mite ◽  
Residual Action ◽  
Volatile Materials

The data presented in this paper were obtained during preliminary tests of acaricides that have been carried on in the greenhouse since 1947. Special attention has been given to the duration of residual action because this is one of the most critical indications of the potential value of an acaricide under field conditions. Residual toxicity in these experiments may he defined as the toxicity of a dry deposit to mites introduced on foliage subsequent to spraying.The modes of action of the various acaricides are uncertain. In most cases it is undoubtedly contact action, although the more volatile materials may have some fumigant effect. Toxicity by direct ingestion is unlikely because of the feeding habits of the mites, but it is possible that some of the compounds tested may have a systemic action, being absorbed by the plant and remaining within the tissues for an extended period.

scholarly journals Gradients in Susceptibility and Resistance Mechanisms of Buddleia L. Taxa to the Two-spotted Spider Mite (Tetranychus urticae Koch)

1999 ◽  
Vol 124 (2) ◽  
pp. 114-121 ◽  
Author(s):  
Jeffrey H. Gillman ◽  
Michael A. Dirr ◽  
S. Kristine Braman
Keyword(s):  
Surface Area ◽  
Spider Mite ◽  
Methylene Chloride ◽  
Leaf Surface ◽  
Spider Mites ◽  
Leaf Pubescence ◽  
Shell Vial ◽  
Methylene Chloride Extract ◽  
Leaf Surface Area ◽  
Two Spotted Spider Mite

Buddleia taxa were assessed for two-spotted spider mite (Tetranychus urticae Koch) resistance using a leaf disk bioassay, a novel shell vial bioassay and a field trial. Leaf pubescence and chemistry were examined for their role in two-spotted spider mite resistance. Results from bioassays and field sampling identified highly resistant taxa including B. fallowiana Balif. `Alba' and B. davidii × B. fallowiana Franch. `Cornwall Blue' as well as susceptible taxa including B. davidii Franch. `African Queen' and B. lindleyana Fort. ex Lindl. `Gloster'. The shell vial bioassay was an accurate predictor of field resistance to spider mite. Leaf pubescence was quantified by calculating the collective length of trichome branches per square millimeter of leaf surface area [effective branch length (EBL)]. EBL values ranged from 39 to 162 mm·mm-2 of leaf surface area among Buddleia taxa. Resistance was positively correlated with increased pubescence. Removal of pubescence by peeling resulted in increased oviposition of two-spotted spider mites. Exposing female two-spotted spider mites to a methylene chloride extract of B. davidii × B. fallowiana `Cornwall Blue' using a modified shell vial bioassay resulted in reduced oviposition and a methylene chloride extract of B. davidii `African Queen' resulted in no difference in oviposition when compared with a control. While pubescence is the best indicator of resistance to the two-spotted spider mite in Buddleia taxa, it is possible that defensive compounds are involved.

Effect of the cereal cyst nematode, Heterodera filipjevi, on wheat in microplot trials

Nematology ◽  
2010 ◽  
Vol 12 (3) ◽  
pp. 357-363 ◽  
Author(s):  
Julie Nicol ◽  
Zahra Tanha Maafi ◽  
Abolfazl Hajihasani ◽  
Saeed Rezaee
Keyword(s):  
Population Density ◽  
Grain Yield ◽  
Yield Loss ◽  
Negative Relationship ◽  
Dry Weight ◽  
Initial Population ◽  
Cyst Nematodes ◽  
Important Species ◽  
Aerial Shoot ◽  
The Impact

AbstractThe cereal cyst nematodes, Heterodera avenae, H. filipjevi and H. latipons, are considered to be the most economically important species of cyst-forming nematodes on wheat. Two trials were conducted in 2006 and 2007 to determine the impact of different initial population levels of H. filipjevi (0, 2.5, 5, 10 and 20 eggs and second-stage juveniles (J2) (g soil)−1) on wheat cv. Sardari in microplots under natural field conditions in Iran. The results showed that increasing the initial populations of H. filipjevi significantly reduced several growth parameters of wheat (plant height, root dry weight, aerial shoot dry weight and grain yield) compared with the untreated controls. The final population of H. filipjevi increased with increasing initial population, while the reproduction factor (Rf) declined as the initial population increased but was greater than 1 in all treatments. Regression analysis showed a significant negative relationship between the initial populations and grain yield. The modelling clearly demonstrated that H. filipjevi is economically important on winter wheat in Iran. Grain yield loss was demonstrated even at the lowest population density and reached a maximum loss of 48% with an initial population density of 20 eggs and J2 (g soil)−1. The aerial shoot yield loss was as great as 40% in both years.

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