Compatibilidade de inseticidas e acaricidas com o percevejo predador Podisus nigrispinus (Dallas) (Heteroptera: Pentatomidae) em algodoeiro

Abstract

-The objectives of this work were to study the insecticides espinosad, lambdacyhalothrin and monocrotophos on the control of Alabama argillacea (Hübner), the compatibility of these insecticides with the predatory stinkbug Podisus nigrispinus (Dallas), and the effects of the insecticides and acaricides methiocarb, pymetrozine, thiamethoxam, abamectin, diafenthiuron, dicofol and propargite on the predatory stinkbug behavior preying upon A. argillacea under field conditions. More than 90% of cotton leafworm control was obtained at the day 0 of application with all insecticides. Control of A. argillacea by lambdacyhalothrin (20 g a.i./ha) and monocrotophos (240 and 320 g a.i./ha) was observed up to day 3 after application; while spinosad (30 and 60 g a.i./ha) prolonged control up to day 5. Monocrotophos and lambdacyhalothrin were significantly more toxic to P. nigrispinus compared to spinosad. Toxicity of monocrotophos and lambdacyhalothrin to P. nigrispinus was evident up to day 3 after application. Survival of P. nigrispinus was affected by methiocarb, thiamethoxam, diafenthiuron, abamectin and sulfur one day after application and only under thiamethoxam treatment after three days. Pymetrozine, dicofol and propargite did not affect P. nigrispinus survival compared to untreated plants. Podisus nigrispinus at the day of application did not prey on A. argillacea under methiocarb treatment, and the predation rate was affected under thiamethoxam, abamectin, diafenthiuron and sulfur treatments at the day of application and after three days. The insecticides pymetrozine and spinosad, and the acaricides dicofol and propargite were compatible to P. nigrispinus and should be considered within a cotton pest management program.KEY WORDS: Integrated pest management, pymetrozine, spinosad, methiocarb, thiamethoxam.RESUMO -Os objetivos deste trabalho foram estudar a ação dos inseticidas espinosade, lambdacialotrina e monocrotofós no controle do curuquerê-do-algodoeiro Alabama argillacea (Hübner), sua compatibilidade com o percevejo predador Podisus nigrispinus (Dallas), e os efeitos dos inseticidas e acaricidas metiocarbe, pimetrozine, tiametoxam, abamectim, diafentiurom, dicofol e propargite na predação de A. argillacea por P. nigrispinus no campo. Inseticidas e concentrações utilizadas proporcionaram controle de A. argillacea acima de 90% no dia da aplicação. O controle de A. argillacea por lambdacialotrina (20 g i.a./ha) e monocrotofós (240 e 320 g i.a./ha) foi observado até três dias após aplicação, enquanto espinosade (30 e 60 g i.a./ha) prolongou o controle acima de 90% até cinco dias. Monocrotofós e lambdacialotrina foram significativamente mais tóxicos para P. nigrispinus comparado a espinosade. O efeito residual de monocrotofós e lambdacialotrina para P. nigrispinus foi evidente até três dias após a aplicação. A sobrevivência de P. nigrispinus foi afetada por metiocarbe, tiametoxam, diafentiurom, abamectim e enxofre após um dia, e apenas por tiametoxam após três dias da aplicação. Pimetrozine, dicofol e proparg...

Toxicity of thiamethoxam and imidacloprid to Podisus nigrispinus (Dallas) (Heteroptera: Pentatomidae) nymphs associated to aphid and whitefly control in cotton

“…Both insecticides were highly toxic to the predatory stinkbug nymphs. In addition, the contamination through direct or residual contact with the predator showed that thiamethoxam and imidacloprid affected the predatory behavior of P. nigrispinus and their survival in the field (Torres et al 2002a). These findings agree with De Cock et al (1996) who reported similar results for 5 th -instar and adults of P. maculiventris through topical and ingestion exposure of imidacloprid.…”

“…Conventional use of insecticides can have deleterious effects on beneficial arthropod populations because beneficial species can have greater susceptibility to low concentrations of insecticides than their prey or host (Ruberson et al 1998). The predatory stinkbug Podisus nigrispinus (Dallas) actively searches its prey on plant canopy (Torres et al 2002b) where it can be exposed to insecticide residues during locomotion, selfcleaning or when feeding on contaminated prey (Torres et al 2002a). P. nigrispinus is also a facultative plant feeder as many other important heteropteran predators in cotton (e.g., Geocoris, Orius, Nabis), what is useful in their survival during periods of low prey density.…”

Toxicity of pymetrozine and thiamethoxam to Aphelinus gossypii and Delphastus pusillus

“…The thiamethoxam showed mortality rate within 30% to 80% and over 80% for larvae and adults fitting to the moderately harmful to harmful insecticide to D. pusillus (Figure 3). These results resemble those by Torres et al (2002) when evaluating the interaction of insecticides and the predatory stinkbug Podisus nigrispinus (Dallas) in cotton, in which pymetrozine caused no effect on the predator survival and predation rate, while the thiamethoxam caused 100% mortality of the caged predators on treated plants up to 72 hours after exposure.…”

Selectivity of insecticide use in soybean crop to the predator Podisus nigrispinus (Hemiptera: Pentatomidae)

“…This application diminishes the potential of beneficial arthropods, as demonstrated in this work, and may allow the resurgence and occurrence of pests at higher population levels (CORRÊA-FERREIRA et al, 2010). Torres and Ruberson (2004) verified the harmful effects of the broad-spectrum insecticides for P. nigrispinus nymphs, which were highly sensitive to thiamethoxam and imidacloprid, while Torres et al (2002) verified the harmful effects of thiamethoxam and other neurotoxic activities.…”