Article InformationIn a randomized complete block design with five repetitions an experiment was conducted to compare the effectiveness of ethoprophos sources at the rate indicated by the manufacturer in the product label, for symphylids control and nematode proliferation. The treatments consisted of ethoprophos (Mocap ® 72EC-AMVAC) at 8 L ha -1 , ethoprophos generic-1 at 13.6 L ha -1 , ethoprophos generic-2 at 12 L ha -1 , Nemacur ® 40EC (fenamiphos-AMVAC) at 8 L ha -1 , each one in 2000 L of water by hectare plus the untreated control. The pre-treatment number of symphylids was similar (P= 0.8391) among experimental plots, varying between 3.52 to 4.56 per plant. When comparing the symphylids per plant at pre-treatment against the average of the evaluations at 15, 35 and 70 days after application in each treatment, ethoprophos generic-1 reduced (P< 0.0001) the population in 86%, ethoprophos generic-2 (P< 0.0001) by 91%, Mocap ® (P< 0.0001) in 83% and Nemacur ® (P< 0.0001) in 78%, while in the untreated plants, the population did not change (P= 0.1621). Compared to the untreated plants, the same applied treatments prevented the infection of Helicotylenchus spp. (P= 0.0126) between 86 and 93%, Pratylenchus spp. (P= 0.0369) between 58 and 63% and total nematodes (P= 0.0212) between 61 and 65%. Although all the products tested were statistically equal in the control of symphylids and the prevention of nematode infection, in the ethoprophos generic-1 and ethoprophos generic-2, the rates tested, which were those registered on the label, were 70 and 50% higher than that of Mocap®, which resulted in higher chemical load. In addition, depending on the ethoprophos generic price, the pest control cost, may be higher with the generic products.