scholarly journals Botanicals Against Tetranychus urticae Koch Under Laboratory Conditions: A Survey of Alternatives for Controlling Pest Mites

Plants ◽  
2019 ◽  
Vol 8 (8) ◽  
pp. 272 ◽  
Author(s):  
Ricardo A. Rincón ◽  
Daniel Rodríguez ◽  
Ericsson Coy-Barrera
Keyword(s):  
Pest Management ◽  
Tetranychus Urticae ◽  
Chemical Control ◽  
Mechanisms Of Action ◽  
Botanical Pesticides ◽  
Total Cost ◽  
Development Of Resistance ◽  
Physiological Processes ◽  
Tetranychus Urticae Koch ◽  
Different Levels

Tetranychus urticae Koch is a phytophagous mite capable of altering the physiological processes of plants, causing damages estimated at USD$ 4500 per hectare, corresponding to approximately 30% of the total cost of pesticides used in some important crops. Several tools are used in the management of this pest, with chemical control being the most frequently exploited. Nevertheless, the use of chemically synthesized acaricides brings a number of disadvantages, such as the development of resistance by the pest, hormolygosis, incompatibility with natural predators, phytotoxicity, environmental pollution, and risks to human health. In that sense, the continuous search for botanical pesticides arises as a complementary alternative in the control of T. urticae Koch. Although a lot of information is unknown about its mechanisms of action and composition, there are multiple experiments in lab conditions that have been performed to determine the toxic effects of botanicals on this mite. Among the most studied botanical families for this purpose are plants from the Lamiaceae, the Asteraceae, the Myrtaceae, and the Apiaceae taxons. These are particularly abundant and exhibit several results at different levels; therefore, many of them can be considered as promising elements to be included into integrated pest management for controlling T. urticae.

Susceptibility and development of resistance of the mite Tetranychus urticae to aerial conidia and blastospores of the entomopathogenic fungus Beauveria bassiana

2020 ◽  
Vol 25 (3) ◽  
pp. 429-443
Author(s):  
Charbel Al Khoury ◽  
Jacques Guillot ◽  
Nabil Nemer
Keyword(s):  
Tetranychus Urticae ◽  
Beauveria Bassiana ◽  
Resistance Development ◽  
Development Of Resistance ◽  
Different Types ◽  
Aerial Conidia ◽  
Resistant Strains ◽  
Two Spotted Spider Mite ◽  
Tetranychus Urticae Koch ◽  
First Time

The virulence of aerial conidia of the entomopathogenic fungi Beauveria bassiana (Balsamo-Crivelli) Vuillemin (Hypocreales: Cordycipitaceae) has been documented on a very broad range of arthropods; however, the activity of blastospores against the two-spotted spider mite has been seldomly reported. Moreover, studies investigating the activity of blastospores under greenhouse conditions were not found in the literature. In this study, we tested the efficacy of blastospores and aerial conidia of two B. bassiana strains, against all life stages of Tetranychus urticae Koch (Acari: Tetranychidae). The concentration of 109 blastospores/ml of the Lebanese strain was the most efficient in laboratory experiments, and the recorded mortalities were 52, 67.9 and 95.3% in treated eggs, motile juveniles and adults, respectively. In greenhouse experiments, higher T. urticae mortalities were recorded among strawberry plants (Fragaria x ananassa) sprayed with blastospores of B. bassiana. Furthermore, the latter plants also recorded a higher yield (454.92 ± 5 g/plant) compared to infested control plants (144.42 ± 5 g/plant) during the growing season. In addition, this study also investigated for the first time the resistance development of T. urticae to different types of infective propagules of B. bassiana. Under selective pressure for 40 generations, the laboratory yielded aerial conidia (AC-TSM) and blastospores (BS-TSM) resistant strains of the mite recorded 28.8- and 8.4- fold change in LC50 values respectively when compared to the field strain; however, this resistance ratio was minimal when compared to those of chemical acaricides.

Using Acaricides in Combination with Phytoseiulus persimilis Athias-Henroit to Suppress Tetranychus urticae Koch Populations

2004 ◽  
Vol 39 (2) ◽  
pp. 267-274 ◽  
Author(s):  
Kenneth W. Cote ◽  
Peter B. Schultz ◽  
Edwin E. Lewis
Keyword(s):  
Pest Management ◽  
Tetranychus Urticae ◽  
Spider Mite ◽  
Phytoseiulus Persimilis ◽  
Predatory Mite ◽  
Twospotted Spider Mite ◽  
Neem Oil ◽  
Buddleia Davidii ◽  
Predaceous Mite ◽  
Tetranychus Urticae Koch

Acaricides are often used to suppress populations of the twospotted spider mite, Tetranychus urticae Koch. Problems associated with acaricide use have led some ornamental producers to incorporate releases of the predaceous mite Phytoseiulus persimilis Athias-Henriot into pest management programs. Our objective was to determine if acaricides could be used with P. persimilis to suppress T. urticae. Ten acaricides were tested against T. urticae on infested Buddleia × davidii ‘White Profusion’ cuttings. Abamectin, chlorfenapyr, Gowan 1725, horticultural oil and neem oil suppressed T. urticae populations 3, 7 and 14 d after application. Bifenthrin suppressed T. urticae populations 7 and 14 d after application, and hexythiazox suppressed T. urticae populations 14 d after application. Azadirachtin, pyridaben and spinosad did not suppress populations. Acaricide applications followed by release of P. persimilis reduced T. urticae populations, but suppression with acaricides followed by predatory mite release was not significantly greater at all times than with acaricide applications alone, or with predator releases without previous acaricide application. Results demonstrate that efficacy is variable among the acaricides tested and that acceptable levels of T. urticae suppression can be achieved with acaricides and P. persimilis.

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