Biological Control of Apple Mites by Mixed Populations of Metaseiulus occidentalis (Nesbitt) and Typhlodromus pyri Scheuten (Acari: Phytoseiidae)

1992 ◽  
Vol 21 (1) ◽  
pp. 202-209 ◽  
Author(s):  
B. A. Croft ◽  
I. V. Macrae
Keyword(s):  
Biological Control ◽  
Typhlodromus Pyri ◽  
Metaseiulus Occidentalis ◽  
Mixed Populations

DISTRIBUTION OF METASEIULUS OCCIDENTALIS (NESBITT) AND TYPHLODROMUS PYRI SCHEUTEN (PARASITIFORMES: PHYTOSEIIDAE) IN APPLE ORCHARDS OF THE HOOD RIVER VALLEY, OREGON

1990 ◽  
Vol 122 (1) ◽  
pp. 5-14 ◽  
Author(s):  
B.A. Croft ◽  
P. Shearer ◽  
G.J. Fields ◽  
H.W. Riedl
Keyword(s):  
Pest Management ◽  
Relative Abundance ◽  
Predatory Mites ◽  
River Valley ◽  
Typhlodromus Pyri ◽  
Phytoseiid Mites ◽  
Factors Influencing ◽  
Metaseiulus Occidentalis ◽  
Mixed Populations ◽  
Principal Species

AbstractIn a survey of predaceous phytoseiid mites from 65 apple blocks in the Hood River Valley, Oregon, Metaseiulus occidentalis (Nesbitt) and Typhlodromus pyri Scheuten were the principal species present. Metaseiulus occidentalis predominated over T. pyri by a ratio of about 2:1 in 1984 mites collected during 1985. In experimental, commercial, and integrated pest management blocks, M. occidentalis was present alone or predominated over T. pyri in up to 88% of the blocks, whereas T. pyri occurred alone or predominated in up to 20% of the blocks. Both species occurred in near equal proportions in a maximum of 20% of blocks. An analysis of nine factors influencing the relative abundance of M. occidentalis and T. pyri indicated that vegetation in the habitat surrounding the block and the pesticides used were most important. In 1986, seasonal distributions and proportions of predatory mites found in individual blocks were similar to those found in 1985. The feasibility of managing mixed populations of T. pyri and M. occidentalis in Hood River orchards is discussed.

Simulating effects of environmental factors on biological control of Tetranychus urticae by Typhlodromus pyri in apple orchards

2013 ◽  
Vol 60 (2) ◽  
pp. 181-203 ◽  
Author(s):  
John Michael Hardman ◽  
Wopke van der Werf ◽  
Suzanne E. Blatt ◽  
Jeffrey L. Franklin ◽  
Richard Karsten ◽  
...  
Keyword(s):  
Biological Control ◽  
Environmental Factors ◽  
Tetranychus Urticae ◽  
Typhlodromus Pyri ◽  
Apple Orchards
Sign in / Sign up

Export Citation Format

Share Document