scholarly journals Effect of Exogenous Methyl Jasmonate on Numerical Growth of the Population of the Two-Spotted Spider Mite (Tetranychus Urticae Koch.) on Strawberry Plants and Young Apple Trees

2010 ◽  
Vol 50 (4) ◽  
Author(s):  
Wojciech Warabieda ◽  
Remigiusz Olszak
Keyword(s):  
Methyl Jasmonate ◽  
Tetranychus Urticae ◽  
Spider Mite ◽  
Apple Trees ◽  
Two Spotted Spider Mite ◽  
Tetranychus Urticae Koch ◽  
Young Apple

scholarly journals The influence of the two-spotted spider mite (Tetranychus urticae Koch.) and irrigation on yield of 5-years-old apple trees

2013 ◽  
Vol 55 (2) ◽  
pp. 113-119
Author(s):  
Wojciech Warabieda ◽  
Remigiusz W. Olszak
Keyword(s):  
Tetranychus Urticae ◽  
Spider Mite ◽  
Fruit Weight ◽  
Economic Injury Level ◽  
Apple Trees ◽  
Economic Injury ◽  
Apple Cultivars ◽  
Effect On Yield ◽  
Two Spotted Spider Mite ◽  
Tetranychus Urticae Koch

The influence of the two-spotted spider mite (<i>Tetranychus urticae</i>) on yield of apple trees was investigated. The experiment was conducted on rrigated and non-irrigated 5-years-old apple trees of 'Close' and 'Jonagold' cultivars grafted on M.9. The population size of the pest exceeded four and two times the valid (in Poland) economic injury level on trees of 'Close' and 'Jonagold' cultivars respectively. No significant influence of mites on yield and its quality (mean fruit weight and fruit colour) was observed on both apple cultivars. Irrigation had positive effect on yield and quality of 'Jonagold'. On the contrary, trees of ' Close' cultivar were positively influenced by irrigation only regarding fruits colour. Results of the study support opinion that the economic injury level for apple orchards, with respect to two-spotted spider mite, should be higher than it is up to now.

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.

Sign in / Sign up

Export Citation Format

Share Document