Abstract
Outbreaks of Myzus persicae (Sulzer) (Hemiptera: Aphididae) populations are not rare in Brassica crops in Pernambuco State (Brazil). The aim of the present study was to perform laboratory assessments in seven insecticide formulations against M. persicae. The direct spray and leaf dip methods were used in the experiment. M. persicae mortality rates were subjected to variance and Probit analyses. Based on the results, thiamethoxam + lambdacyhalothrin, thiamethoxam, lambda-cyhalothrin and thiamethoxam + chlorantraniliprole were the most efficient insecticides after 24-hour exposure, since they caused over 95% mortality through the direct spray method. LC50s ranged from 0.10 to 9.1 mg a.i./L in chlorfenapyr and chlorantraniliprole, respectively, in the leaf dip method. All insecticides were effective against M. persicae, except for chlorantraniliprole. Chlorfenapyr, lambda-cyhalothrin, pymetrozine and thiamethoxam + lambda-cyhalothrin were the most toxic to this aphid.
Highlights
Green peach or peach-potato aphid, Myzus persicae (Sulzer) (Hemiptera: Aphididae), is among groups of pest-insects that have successfully exploited the agricultural environment and acknowledged worldwide as one of the most harming agricultural pests (Margaritopoulos et al, 2009)
Thiamethoxam (14.1%) + lambda-cyhalothrin (10.6%) (Neonicotinoid + Pyrethroid, Engeo Pleno, Syngenta S.A.), lambda-cyhalothrin (Karate 50 EC, Syngenta S.A.), chlorfenapyr (Pyrrole, Pirate 2 40 SC, Basf), thiamethoxam (Actara 250 WG, Syngenta S.A.), chlorantraniliprole (Anthranilic Diamide, Premio SC, Dupont), thiamethoxam (20%) + chlorantraniliprole (10%) (Voliam Flexi, Syngenta S.A.) and pymetrozine (Pyridine Azomethine, Chess 500 WG, Syngenta S.A.) were the insecticides used in the experiment
Insecticides thiamethoxam + lambda-cyhalothrin, thiamethoxam, lambdacyhalothrin and thiamethoxam + chlorantraniliprole were the most efficient in causing over 95% mortality
Summary
Green peach or peach-potato aphid, Myzus persicae (Sulzer) (Hemiptera: Aphididae), is among groups of pest-insects that have successfully exploited the agricultural environment and acknowledged worldwide as one of the most harming agricultural pests (Margaritopoulos et al, 2009). Outbreaks of M. persicae populations in brassica crops often account for losses faced by producers from Pernambuco State (Northeastern Brazil). M. persicae, Brevicoryne brassicae (L.) and Lipaphis erysimi (Kalt.) are the most harming pest aphids in Brassica crops, since they cause up to 70%-80% yield reduction under favorable conditions (Khan et al, 2015). High density M. persicae populations attacked Brassica rapa var. Pekinensis (known in Brazil as “couve-chinesa”) at the experimental field from the Universidade Federal de Pernambuco (UFRPE). The M. persicae population in this site does not have history of exposure to any insecticide type; it is possible assuming that this population was susceptible to new insecticides such as chlorantraniliprole, chlorfenapyr and pymetrozine in Brassica rapa var. There is no register of any insecticide to control M. persicae in B. rapa var.
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