Toxicity of Four Fungicides to the Predaceous Mite Typhlodromus pyri (Acari: Phytoseiidae)

1998 ◽  
Vol 91 (4) ◽  
pp. 802-811 ◽  
Author(s):  
Serge Kreiter ◽  
Gilles Sentenac ◽  
David Barthes ◽  
Philippe Auger
Keyword(s):  
Typhlodromus Pyri ◽  
Predaceous Mite

Effects of encapsulation on the toxicity of insecticides to the Oriental fruit moth (Lepidoptera: Tortricidae) and the predator Typhlodromus pyri (Acari: Phytoseiidae)

2001 ◽  
Vol 133 (6) ◽  
pp. 819-826 ◽  
Author(s):  
M.K. Pogoda ◽  
D.J. Pree ◽  
D.B. Marshall
Keyword(s):  
First Generation ◽  
Typhlodromus Pyri ◽  
Oriental Fruit Moth ◽  
Susceptible Population ◽  
Emulsifiable Concentrate ◽  
Lambda Cyhalothrin ◽  
Predaceous Mite ◽  
Neonate Larvae ◽  
Two Populations ◽  
Laboratory Bioassays

AbstractWe assessed the effects of microencapsulation on the toxicity of chlorpyrifos, cypermethrin, and lambda-cyhalothrin to larvae of the Oriental fruit moth, Grapholita molesta (Busck), in the laboratory and the field. We also compared the toxicity of microencapsulated and traditional formulations to pyrethroid-susceptible and pyrethroid-resistant populations of the predaceous mite Typhlodromus pyri Scheuten in the laboratory. In laboratory bioassays with neonate larvae of G. molesta, the microencapsulated formulations of chlorpyrifos and cypermethrin were less toxic than the wettable-powder and emulsifiable-concentrate formulations. The emulsifiable-concentrate and microencapsulated formulations of lambda-cyhalothrin were equally toxic. In the field, all trees in insecticide-treated plots contained less damage by first generation G. molesta larvae than unsprayed controls. In the second generation, the microencapsulated formulations of cypermethrin and chlorpyrifos were generally less effective than the emulsifiable-concentrate formulation of cypermethrin. The microencapsulated formulation of lambda-cyhalothrin was as effective as the emulsifiable-concentrate formulation. The microencapsulated formulation of cypermethrin was less toxic than the emulsifiable-concentrate formulation to both pyrethroid-susceptible and pyrethroid-resistant populations of T. pyri. Both populations were highly resistant to chlorpyrifos and unaffected by either formulation. The microencapsulated formulation of lambda-cyhalothrin affected the two populations of T. pyri differently; the microencapsulated formulation was approximately fivefold more toxic than the emulsifiable-concentrate formulation to the pyrethroid-susceptible population, but sixfold less toxic than the emulsifiable-concentrate formulation to the pyrethroid-resistant population. Much of the selectivity reported for the microencapsulated formulations of cypermethrin and chlorpyrifos appeared related to a general reduction in toxicity to both target insects and beneficial mites. The microencapsulated lambda-cyhalothrin was as toxic as the emulsifiable-concentrate formulation to the target insect but was less toxic than the emulsifiable concentrate to pyrethroid-resistant predator mites. This limited increased selectivity may be useful where resistant populations of predators occur.

scholarly journals Influence of leaf trichomes on predatory mite (Typhlodromus pyri) abundance in grape varieties

2008 ◽  
Vol 45 (3-4) ◽  
pp. 111-122 ◽  
Author(s):  
R. Loughner ◽  
K. Goldman ◽  
G. Loeb ◽  
J. Nyrop
Keyword(s):  
Predatory Mite ◽  
Typhlodromus Pyri ◽  
Leaf Trichomes ◽  
Grape Varieties
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