FIELD EVALUATION OF THREE BIO-ACARICIDES AGAINST THE TWO-SPOTTED SPIDER MITE, TETRANYCHUS URTICAE KOCH AND THEIR EFFECT ON THE DOMINANT PREDATORS IN EGYPTIAN COTTON FIELDS.

2007 ◽  
Vol 12 (1) ◽  
pp. 251-261
Author(s):  
Hany El-Kawas ◽  
Waheed Desuky ◽  
Aly El-Sheakh
Keyword(s):  
Tetranychus Urticae ◽  
Spider Mite ◽  
Field Evaluation ◽  
Cotton Fields ◽  
Two Spotted Spider Mite ◽  
Tetranychus Urticae Koch ◽  
Egyptian Cotton

scholarly journals Pathogenic agents associated with The two-spotted spider mite, Tetranychus urticae Koch in some cotton field in Al Hassakah Province, Syria: حصر الكائنات الممرضة المرافقة للأكاروس الأحمر ذو البقعتين Tetranychus urticae Koch في بعض حقول القطن في محافظة الحسكة، سورية

2020 ◽  
Vol 4 (4) ◽  
Author(s):  
Ammar Khalaf Daher, Ziad Barbar, Ismail Al-Mohamed
Keyword(s):  
Tetranychus Urticae ◽  
Spider Mite ◽  
Pathogenic Fungi ◽  
Fungal Species ◽  
Cotton Field ◽  
Cotton Fields ◽  
Pathogenic Organisms ◽  
Two Spotted Spider Mite ◽  
Pathogenic Agents ◽  
Tetranychus Urticae Koch

The two-spotted spider mite, Tetranychus urticae Koch, is a phytophagous pest that can cause significant yield losses in cotton fields, and pathogenic organisms are very important to control them. A study was conducted in some cotton fields at Al-Hassakeh province through season 2019 to survey pathogenic organisms associated with two-spotted spider mite. Results showed the isolation and diagnosis of five types of pathogenic fungi with an infection rate of 13.33% Results showed that five fungal species of 4 genera and one bacteria were identified. The Aspergillus niger was the most frequently isolated fungus with 23.33 % frequency, followed by, Neozygites floridana, Aspergillus terreus, Beauveria bassiana, Penicillium sp. and bacteria Bacillus thuringiensis with a frequency of 18.66, 14.66, 13.33, 6.66 % and 23.33%, respectively. The Results showed that the pathogens played an important role to control the two-spotted spider mite (T. urticae).   

scholarly journals Effects of local isolates of Beauveria bassiana (Balsamo) Vuillemin on the two-spotted spider mite, Tetranychus urticae (Koch) (Acari: Tetranychidae)

2021 ◽  
Vol 31 (1) ◽  
Author(s):  
Cenk Yucel
Keyword(s):  
Tetranychus Urticae ◽  
Beauveria Bassiana ◽  
Spider Mite ◽  
Lethal Effect ◽  
Probit Analysis ◽  
Plant Feeding ◽  
Wide Range ◽  
Two Spotted Spider Mite ◽  
Short Time ◽  
Tetranychus Urticae Koch

Abstract Background The two-spotted spider mite, Tetranychus urticae (Koch) (Acari: Tetranychidae), is a widely distributed plant-feeding pest that causes significant yield losses in a wide range of crops. Newly developed or improved environmentally friendly biocontrol agents serve as an alternative to traditional pest control tools. Experiment of the effects of 2 local fungal isolates of Beauveria bassiana (BGF14 and BCA32) was carried out against T. urticae under laboratory conditions. Results Both tested isolates had lethal effect in a short time after application, and this effect increased as time progressed. BGF14 and BCA32 isolates caused T. urticae mortality rates ranging from 25.88 to 61.92 and 32.36 to 62.03% when applied at the concentrations between 1×105 and 1×108 conidia/ml, respectively. According to the Probit analysis performed on the effect of fungi on T. urticae adults, the LC50 values of BGF14 and BCA32 isolates on the 7th day after inoculation were 2.6×106 and 6.3×104 conidia/ml, respectively, and the LT50 values for both fungi applied at a concentration of 108 conidia/ml were 2.14 and 2.23 days, respectively. Conclusions The 2 isolates of B. bassiana (BGF14 and BCA32) had the potentials to suppress T. urticae population and can be recommended as promising biocontrol agent candidates for control of T. urticae.

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