Biological Control of Citrus Thrips, Scirtothrips citri (Thysanoptera: Thripidae), in Southern California Citrus Groves

1985 ◽  
Vol 14 (6) ◽  
pp. 733-741 ◽  
Author(s):  
L. K. Tanigoshi ◽  
J. Fargerlund ◽  
J. Y. Nishio-Wong ◽  
H. J. Griffiths
Keyword(s):  
Biological Control ◽  
Southern California ◽  
Citrus Groves ◽  
Scirtothrips Citri

Establishment ofRhinocyllus conicuson Milk Thistle in Southern California

Weed Science ◽  
1977 ◽  
Vol 25 (3) ◽  
pp. 288-292 ◽  
Author(s):  
R.D. Goeden ◽  
D.W. Ricker
Keyword(s):  
Biological Control ◽  
Field Data ◽  
Southern California ◽  
Milk Thistle ◽  
Silybum Marianum ◽  
Mortality Factors ◽  
Ladybird Beetles ◽  
Rhinocyllus Conicus ◽  
Pupal Parasitism

During 1971 and 1972, 4,400 adults ofRhinocyllus conicusFroelich were introduced into southern California from Italy for the biological control of milk thistle [Silybum marianum(L.) Gaertner]. These flowerhead-infesting weevils were colonized at nine, and successfully established at five, widely separated locations. Field data on the incidence and increase ofR. conicusat colonization sites are presented. Biotic mortality factors reported forR. conicusin southern California include predation of eggs by ladybird beetles (Hippodamiasp.) and of adults by snakeflies [Raphidia (Agulla) adnixaHagen] and spiders, destruction of weevils in flower-heads consumed by cattle and rodents, and larval and pupal parasitism by pyomotid mites.

The Use of Wind Machines and Helicopter Flights for Frost Protection

1949 ◽  
Vol 30 (3) ◽  
pp. 79-85 ◽  
Author(s):  
Robert T. Small
Keyword(s):  
Southern California ◽  
The Other ◽  
Citrus Groves ◽  
Frost Protection ◽  
Stationary Type

A summary of two separate investigations, one on the use of stationary type “wind machines” and the other on the use of low helicopter flights as a means of mixing the layer of warm air that normally exists, during the night, at 300 to 800 feet above the surface with the cold layer at the surface. The investigations were carried on during nights of frost hazard in Southern California citrus groves.

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