Twospotted Spider Mite (Acari: Tetranychidae) and Phytoseiulus persimilis (Acari: Phytoseiidae) on Greenhouse Roses: Spatial Distribution and Predator Efficacy

1995 ◽  
Vol 88 (2) ◽  
pp. 352-357 ◽  
Author(s):  
Zhi-Qiang Zhang ◽  
John P. Sanderson
Keyword(s):  
Spatial Distribution ◽  
Spider Mite ◽  
Phytoseiulus Persimilis ◽  
Twospotted Spider Mite ◽  
Twospotted Spider

scholarly journals Compatibility of Three Miticides with the Predatory Mites Neoseiulus californicus McGregor and Phytoseiulus persimilis Athias-Henriot (Acari: Phytoseiidae)

HortScience ◽  
2006 ◽  
Vol 41 (3) ◽  
pp. 707-710 ◽  
Author(s):  
Raymond A. Cloyd ◽  
Cindy L. Galle ◽  
Stephen R. Keith
Keyword(s):  
Spider Mite ◽  
Production Systems ◽  
Phytoseiulus Persimilis ◽  
Predatory Mites ◽  
Mite Species ◽  
Predatory Mite ◽  
Neoseiulus Californicus ◽  
Twospotted Spider Mite ◽  
Greenhouse Production ◽  
Twospotted Spider

In this study, we report on the compatibility of two commercially available predatory mites, Neoseiulus californicus and Phytoseiulus persimilis, with three miticides used in greenhouse production systems to control the twospotted spider mite, Tetranychus urticae. We determined the lethal effects of the miticides chlorfenapyr, spiromesifen, and bifenazate to both predatory mite species 24 hours after exposure to spray applications in petri dishes. Two rates of chlorfenapyr (0.40 and 0.81 mL/2-L) and spiromesifen (0.15 and 0.31 mL·L–1), and one rate of bifenazate (0.62 mL·L–1) were used. All rates were based on the manufacturer label recommendations for twospotted spider mite. Both rates of chlorfenapyr and spiromesifen, and the single rate of bifenazate were not harmful to N. californicus with percent live mite values ≥85% for chlorfenapyr and ≥95% for spiromesifen, and 93% for bifenazate. However, these same miticides were substantially toxic to P. persimilis with percent live mite values of ≤63% for all the miticides tested. Based on the results of this study, the miticides chlorfenapyr, spiromesifen, and bifenazate are compatible with N. californicus whereas these miticides are toxic to P. persimilis indicating a difference in susceptibility based on predatory mite species.

scholarly journals Compatibility of Acaricide Residues with Phytoseiulus persimilis and Their Effects on Tetranychus urticae

HortScience ◽  
2002 ◽  
Vol 37 (6) ◽  
pp. 906-909 ◽  
Author(s):  
Kenneth W. Cote ◽  
Edwin E. Lewis ◽  
Peter B. Schultz
Keyword(s):  
Tetranychus Urticae ◽  
Spider Mite ◽  
Phytoseiulus Persimilis ◽  
Leaf Disk ◽  
Twospotted Spider Mite ◽  
Neem Oil ◽  
Disk System ◽  
Nursery Crops ◽  
Favorable Conditions ◽  
Twospotted Spider

The twospotted spider mite, Tetranychus urticae Koch, is a serious pest of many nursery crops. Regular acaricide applications are required to maintain acceptable population levels of this pest. Phytoseiulus persimilis Athias-Henriot is a commercially available predator used to control T. urticae populations. The effects of acaricide residues were tested on P. persimilis and T. urticae using a leaf disk system. Both species were exposed to residues for 24 hours 1, 3, 7, and 14 days after acaricide application. Abamectin, Gowan 1725, hexythiazox, horticultural oil, neem oil, pyridaben, and spionosyn residues caused no mortality to P. persimilis 1, 3, 7, or 14 days after application. Chlorfenapyr was harmful to both species at all times after application. Bifenthrin residue was toxic to P. persimilis at all times after application, but was only harmful to T. urticae up to one week after application. Tetranychus urticae mortality from Gowan 1725, horticultural oil, and neem oil residues was significantly greater than the control 24 hours after application, but not thereafter. Tetranychus urticae mortality from hexythiazox and spinosad residues was not significantly greater than the control. Proper pesticide selection may create favorable conditions for release of P. persimilis and reduce acaricide dependency.

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