scholarly journals Evaluation of Effectiveness of AC 303630 and Flucycloxuron Mixtures against Tetranychus urticae (Acari: Tetranychidae) under Laboratory and Field Conditions

1996 ◽  
Vol 31 (1) ◽  
pp. 67-73 ◽  
Author(s):  
Young-Joon AHN ◽  
Jai-Ki YOO ◽  
Jum-Rae CHO ◽  
Jeang-Oon LEE ◽  
Sung-Chul MOON
Keyword(s):  
Tetranychus Urticae ◽  
Field Conditions

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.

Effect of Pesticide Interactions on the Twospotted Spider Mite on Peanuts1,2

1978 ◽  
Vol 5 (2) ◽  
pp. 83-86 ◽  
Author(s):  
W. V. Campbell
Keyword(s):  
North Carolina ◽  
Tetranychus Urticae ◽  
Spider Mite ◽  
Field Conditions ◽  
Severe Injury ◽  
Twospotted Spider Mite ◽  
Tetranychus Urticae Koch ◽  
Twospotted Spider

Abstract Pesticides commonly applied to the foliage of peanuts in North Carolina were evaluated under field conditions for their effect on the twospotted spider mite Tetranychus urticae Koch. Most fungicides caused a higher mite increase than insecticides on NC 2 peanuts. When fungicides and insecticides were tank mixed or applied on alternate weeks, mite outbreaks occurred. These outbreaks were followed by severe injury to the foliage and finally defoliation and yield reductions. Among the fungicides applied only Du-Ter and Copper Count failed to cause significant mite damage even when combined with an insecticide. Since mites failed to develop on untreated peanuts following six or more mite releases during the season, it was apparent that pesticides predispose peanuts to spider mite buildup and damage.

scholarly journals Biochemical Estimations of Tetranychus urticae Koch Infested Marigold Leaves in Summer and Winter Seasons under Screen House and Field Conditions

2021 ◽  
Author(s):  
Karuna Bamel ◽  
Rachna Gulati ◽  
Keshav Bamel
Keyword(s):  
Tetranychus Urticae ◽  
Statistical Significance ◽  
Winter Season ◽  
Dry Weight ◽  
Field Conditions ◽  
Randomized Design ◽  
Red Spider Mite ◽  
Completely Randomized Design ◽  
Tetranychus Urticae Koch ◽  
Screen House

Background: African marigolds an important medicinal and ornamental plant is grown throughout the world. The two spotted red spider mite, Tetranychus urticae is one of the most destructive pests of the crop. Methods: Estimation of various minerals and stress measures of T. urticae infested and non infested leaves was performed in two seasons namely summer and winter under both screen house and field conditions. ANOVA was analysed under two factorial Completely Randomized Design. Mite population per leaf was correlated with each biochemical measures and statistical significance of data was analyzed. Result: Significantly lower nitrogen, phosphorous and potassium content was recorded in infested (2.01, 0.307, 1.509% dry weight) leaves as compared to uninfested leaves (2.93, 0.387, 1.874% dry weight) respectively. Summer season reported higher per cent loss in mineral content as compared to the winter season. The content of total phenol and proline was significantly more in infested leaves (18.75 mg/g, 57.07 µ/100 g) as compared to the uninfested leaves (11.42 mg/g and 47.50 µ/100 g). The per cent increase of phenol and proline ranged from (43.90 and 20.81%) in summer and (42.90 and 17.45%) in winter, respectively.

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