The maize weevil Sitophilus zeamais Mots. has frequently occurred in temperate fruits in the field, damaging peaches in Pelotas, RS, apples in Fraiburgo, SC and grapes in Serra Gaúcha, RS, Brazil. This work evaluated in laboratory, the effect of deltamethrine (Decis 25 CE, 40mL 100L-1), dimetoate (Dimetoato CE 150mL 100L-1), thrichlorphon (Dipterex 500 SNAqC 300mL 100L-1), phosmet (Imidan 500 PM, 200g 100L-1), fenthion (Lebaycid 500 CE 100mL 100L-1), chlorpiriphos (Lorsban 480 BR, 150mL 100L-1), malathion (Malation 1000, 200mL 100L-1), carbaryl (Sevin 480 SC, 360mL 100L-1), fenitrothion (Sumithion 500 CE, 150mL 100L-1) and methidathion (Supracid 400 CE, 100mL 100L-1) commonly used in temperate fruit pest control and the new insecticides thiamethoxam (Actara 250 WG, 15 e 30g 100L-1), emamectin benzoate (Proclaim 5 SG, 10 e 20g 100L-1), imidacloprid (Provado 200 SC, 30 e 60mL 100L-1), spinosad (Tracer 480 CE, 10 e 20mL 100L-1) and etofenprox (Trebon 100 SC, 100 e 150mL 100L-1). Experiments were conducted treating apple fruits with an insecticide solution per 10 seconds (residual contact) and offered to adults of S. zeamais sp, and by spraying compounds directly on adults (direct contact). The insecticides trichlorfon (150g 100L-1), fenthion (50g 100L-1), chlorpiriphos (72g 100L-1), malathion (200g 100L-1), methidathion (40g 100L-1) and thiamethoxam (3.75 and 7.5g 100L-1) were efficient in the control of the maize weevil by residual contact. Fenthion (50g 100L-1), chlorpiriphos (72g 100L-1), malathion (200g 100L-1), fenitrothion (75g 100L-1) and methidathion (40g 100L-1) were efficient by direct contact.
maize weevil; apple; neonicotinoid
