Hickel, E.R., & Schuck, E. 2005 Tempo de imersão de cistos em solucao de meridatiom para contrôle da perola-da-terra, Eurhizococcus brasiliensis. [Immersion time of cysts in methidathion solution to control ground-pearl Eurhizococcus brasiliensis].. Agropecuaria Catarinense 18(2): 93-95.

Notes: The root immersion of grapevine seedlings in insecticide solution is a preplanting technique recommended to control some eventual infestation of groundpearl, Eurhizococcus brasiliensis. However, the minimum time in order to get 100% of insect mortality as well as the eventual insect protection against insecticide in clods must be determined. Clean and encrusted cysts of groundpearl were immersed for 0, 1, 10, 60 and 120 seconds in a 0.08% a.i. methidathion solution. Encrusted cysts in fungal coat were used to simulate the clod protection against insecticide. Each experimental unit, replicated three times, had 20 clean cysts or almost 10 encrusted cysts. The number of dead cysts was recorded in 15- or 20-day intervals. The percentage of insect mortality was proportional to the immersion time in insecticide solution and the time of 120 seconds resulted in 100% mortality, for both clean and encrusted cysts. Therefore, 120 seconds is the minimum time for grapevine root immersion in methidathion solution in order to control 100% of ground pearl infestation.