The Effect of Some New Acaricides on The Two Spotted Spider Mite Tetranychus urticae on Water Melon and Their Side Effect on Spiders ( Araneae)

Document Type : Original research articles

Authors

Plant Protection Research. Institute , ARC., Giza, Egypt

Abstract

The efficiency  of  different groups of  pesticides  to  suppress the  population  of  the  two  spotted  spider  mite, Tetranychus urticae  Koch  on  water melon plants was studied.  The  pesticides  include  three  biochemical  compounds:  Yurmak  1.8%
EC (Abamectin),  Veto 5% EC  (Abamectin),  and Biofly  30x103  WP (Beauvaria  bassiana); three  acaricides:  Ortus 5% SC  (Fenpyroximate),  Acarots  5%  EW  (Fenpyroximate)  and  Prince  10%  EC  (Hexythiazox)  and  two  mixture compounds:  Nest 20% SC (Abamectin2o/o  + Spirodiclofen  18 %) afi Perfect 12%EW  (Abamectin  2%  + Chlorfenapyr 10% ).  They  were applied for  one  time  to  control T. urticae  infesting  water melon plants  during  the  experimental period.  The  different  acaricides  formulations  were effective  to control  T. urticae  for  two  weeks  after  application. Abamectin  (biochemical)  was  more  effective  in  reducing  TSSM  population  than  true  spiders  and revealed  less  effect  on associated  predators;  while Hexythiazox was  the  most harmful  acaricide  in  reducing true  spider  populations.  The results  will  be  helpful  to  develop  IPM  Programs  with true  spiders  in  agricultural  crops.

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