ABSTRACT
plants, this experiment was carried out using the randomised complete block design with 4 replications (plots with 3,000 m²). The treatments were: 1) Pirephos (fenitrotion + esfenvalerate) 800 + 40 CE (0.6 L ha-1); 2) Sumidan (esfenvalerate) 150 CE (0.2 L ha-1); 3) Decis (deltametrin) 25 CE (0.4 L ha-1); 4) Thiodan (endosulfan) 350 CE (2.0 L ha-1); 5) Folidol (parathion methyl)) 600 CE (1.0 L ha-1) and 6) Control. The insecticides were applied at 62, 73, 84 and 95 days after crop emergence. To evaluate the biological disequilibrium an evaluation was made at the 125 days after crop emergence, by counting the number of infested plants with levels attribution for the symptoms severity found (damage scale from 1 to 10, where 1 = absence of symptoms and 10 = whole plants defoliated). The highest populational disequilibrium of the spider mite was caused by Folidol 600 CE, with 46% of infested plants and 1.72 average severity level; the second insecticide that caused more disequilibrium with 21.75% of infested plants and 0.5 for severity level was Thiodan 350 CE. The control and the other treatments were similar statistically.
KEY WORDS
Environmental impact; pyrethroids; organophosphates; cyclodienes