The influence of some natural enemies and pesticides on various populations of Tetranychus cinnabarinus (Boisduval), T. Lombardinii Baker and Pritchard and T. Ludeni Zacher (Acari : Tetranychidae), with aspects of their biologies

• Main Author: Coates, Thomas James Dagless
• Published: 2014
• Subjects: Tetranychus cinnabarinus; Insecticides - Toxicology; Pesticides - Toxicology
• Online Access: http://hdl.handle.net/10210/11781

D.Sc. (Zoology) === The influence of some natural enemies and pesticides was studied on Tetranychus cinnabarinus (Boisduval), T. lombardinii Baker & Pritchard and T. ludeni Zacher (Acari: Tetranychidae). Two important predators were discovered, viz: Pardosa crassipalpis (Purcell) (Arachnida: Araneida) and Labidura riparia (Insecta: Dermaptera). Both are more susceptible to some acaricides, especially dimethoate, than the mites. It is proved that the injudicious use of these acaricides, also of DDT and carbaryl, can cause an outbreak of these mites. As to the biologies of the species, the appearance was noted of a fourth chrysalis stage during the development of three T. cinnabarinus females.