Economic injury level for Tetranychus urticae Koch on parthenocarpic cucumber under protected environment in north-western Indian Himalayas

2021 ◽  
Author(s):  
Dilip Shriram Ghongade ◽  
Ajay Kumar Sood
Keyword(s):  
Tetranychus Urticae ◽  
Economic Injury Level ◽  
Economic Injury ◽  
Tetranychus Urticae Koch ◽  
North Western ◽  
Indian Himalayas

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 Economic Injury Levels of Tetranychus urticae Koch (Acari, Tetranychidae) Infesting Eggplant in Greenhouse

2008 ◽  
Vol 47 (4) ◽  
pp. 395-400 ◽  
Author(s):  
Ju-Rak Lim ◽  
Seon-U Choi ◽  
Ju-Hee Kim ◽  
Hyung-Cheol Moon ◽  
Ki-Kwon Lee ◽  
...  
Keyword(s):  
Tetranychus Urticae ◽  
Economic Injury ◽  
Tetranychus Urticae Koch

scholarly journals Damage assessment and economic injury level of the two-spotted spider mite Tetranychus urticae in soybean

2020 ◽  
Vol 55 ◽  
Author(s):  
Guilherme Padilha ◽  
Rubens Alex Fiorin ◽  
Alberto Cargnelutti Filho ◽  
Henrique Pozebon ◽  
John Rogers ◽  
...  
Keyword(s):  
Grain Yield ◽  
Tetranychus Urticae ◽  
Spider Mite ◽  
Grain Weight ◽  
Economic Injury Level ◽  
Control Cost ◽  
Economic Injury ◽  
Four Levels ◽  
Two Spotted Spider Mite ◽  
Whole Plants

Abstract: The objective of this work was to quantify the reduction of soybean grain yield caused by Tetranychus urticae damage, and to propose an economic injury level (EIL) for this pest in the crop. The experimental design was set up in randomized complete blocks, with four replicates and a 4x2 factorial arrangement with four levels of mite infestation, with or without mite control. Chlorotic symptoms were evaluated using a damage scale of 1 to 4. Soybean grain yield, number of pods, number of grains, and 1,000-grain weight were quantified for each segment of plant canopy (lower, middle, and upper) and for the whole plants. The chlorophyll content in the leaves was evaluated using the SPAD index. The population density of one two-spotted spider mite per cm2 of leaf area caused the following reductions: one pod per plant, two grains per plant, 0.7 g of 1,000-grain weight, and 0.35 g of grain yield per plant or 42 kg ha-1. Based on the equation y = 4,369 - 41.99x, the EIL of one two-spotted spider mite per cm2 is determined by considering a control cost of US$ 20.00 ha-1 and a soybean crop value of US$ 350.00 Mg-1. As to chlorotic symptoms, the EIL is set between damage scores 1 (no apparent mite damage) and 2 (yellow mottling beginning to appear).

ОСОБЕННОСТИ ФОРМИРОВАНИЯ РЕЗИСТЕНТНОСТИ К АКАРИЦИДУ Floramite® (БИФЕНАЗАТ) У ОБЫКНОВЕННОГО ПАУТИННОГО КЛЕЩА Tetranychus urticae Koch

2018 ◽  
Vol 53 (5) ◽  
pp. 1045-1053
Author(s):  
И.Н. ЯКОВЛЕВА ◽  
◽  
Ю.И. МЕШКОВ ◽  
Н.Н. САЛОБУКИНА ◽  
В.В. МИХАЙЛОВА ◽  
...  
Keyword(s):  
Tetranychus Urticae ◽  
Tetranychus Urticae Koch
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