Aduba？？o mineral e organica e a densidade populacional de Thrips tabaci Lind. (Thysanoptera: Thripidae) em cebola

the effect of the mineral and organic fertilization on onion thrips, thrips tabaci lind., population density was evaluated at ituporanga experiment station, epagri, santa catarina state, brazil, between august and december 1998. the treatments were different levels of mineral fertilization with n, p2o5 and k2o at recommended rate and three times recommended rate, the organic fertilization and without fertilization was check. the treatments in nutrient rate were: 30 + 120 + 60kg npk ha-1; 90 + 360 + 180kg npk ha-1; 75kg n ha-1; 225kg n ha-1; 80kg p2o5 ha-1; 240kg p2o5 ha-1; 60kg k2o ha-1; 180kg k2o ha-1; 75kg n ha-1 + 80kg p2o5 ha-1 (swine manure + phosphate rock); 225kg n + 240kg p2o5 ha-1 (swine manure + phosphate rock); 37,5kg n + 40kg p2o5 ha-1 (swine manure + phosphate rock); check without fertilizer. the onion thrips population density was similar among treatments with fertilizer and the check without fertilization. the mineral fertilization didn？t increase significantly onion thrips incidence.