Avaliação de inseticidas no controle de Sitophilus oryzae (Linnaeus) (Coleoptera, Curculionidae) e Rhyzopertha dominica (Fabricius) (Coleoptera, Bostrichidae) em trigo armazenado

Efficacy of insecticides to control Sitophilus oryzae (Linnaeus) (Coleoptera, Curculionidae) and Rhyzopertha dominica (Fabricius) (Coleoptera, Bostrichidae) in stored wheat

Insecta; chemical control; stored-product pests

Avaliação de inseticidas no controle de Sitophilus oryzae (Linnaeus) (Coleoptera, Curculionidae) e Rhyzopertha dominica (Fabricius) (Coleoptera, Bostrichidae) em trigo armazenado¹

Efficacy of insecticides to control Sitophilus oryzae (Linnaeus) (Coleoptera, Curculionidae) and Rhyzopertha dominica (Fabricius) (Coleoptera, Bostrichidae) in stored wheat

Rui S. Furiatti^I; Paulo R.V.S. Pereira^II; Airton R. Pinto Jr.^II; Flávio A. Lazzari^II

^IDepartamento de Agronomia, Universidade Estadual de Ponta Grossa. Praça Santos Andrade, Caixa Postal 992, 84100-970 Ponta Grossa, Paraná, Brasil

^IIDepartamento de Zoologia, Universidade Federal do Paraná. Caixa Postal 19020, 81531-990 Curitiba, Paraná, Brasil

ABSTRACT

The efficiency of insecticides against Sitophilus oryzae (Linnaeus, 1763) (Coleoptera, Curculionidae) and Rhyzopertha dominica (Fabricius, 1792) (Coleoptera, Bostrichidae) was determined exposing them to treated wheat in laboratory. Each plot, which was composed by 1.2 kg of wheat grain, was treated with 5 ml of the concentration/kg of wheat using a propelling air atomizer. Fifteen days after treatment 50 g samples of the grain were taken, from each plot, placed in plastic jars into which 10 adult insects of each species were released. This was repeated every 30 days until 165 days after treatment. The number of dead insects was counted 15 days after each infestation thus the evaluations were made at 30, 60, 90, 120, 150 and 180 days after the insecticide application. Esfenvalerate+fenitrothion+pyperonil butoxide (0,375+7,5+3,0 and 0,5+10,0+4,0 g a.i./t), fenitrothion+esfen-valerate (7,5+0,375 and 10,0+0,375 g a.i./t), fenitrothion+synergised deltamethrin (7,5+0,375 g a.i./t) and fenitrothion (7,5 g a.i./t) were effective against Sitophilus oryzae until 180 days after treatment. Esfenvalerate+fenitrothion+pyperonil butoxide (0,5+10,0+4,0 g a.i./t), fenitrothion+esfenvalerate (7,5+0,375 and 10,0+0,375 g a.i./t), fenitrothion+synergised deltamethrin (7,5+0,375 g a.i./t) were effective against R. dominica until 180 days after treatment. Synergised deltamethrin (0,375 g a.i./t) was effective against S. oryzae until 150 days and against R. dominica until 120 days after treatment. Esfenvalerate (0,5 g a.i./t) was ineffective against S. oryzae and effective until 60 days after treatment against R. dominica. Fenitrothion (7,5 g a.i./t) was ineffective against R. dominica. The use of mixtures of organophosphorus plus pyrethroids were more effective against S. oryzae and R. dominica when compared with these insecticides used alone.

Key words: Insecta, chemical control, stored-product pests

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Recebido em 07.XI.1997; aceito em 08.III.1999.

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Contribuição número 917 do Departamento de Zoologia, Universidade Federal do Paraná.

Datas de Publicação

• Publicação nesta coleção
  10 Jul 2009
• Data do Fascículo
  Mar 1999

Histórico

• Recebido
  07 Nov 1997
• Aceito
  08 Mar 1999