Controle do Coró Liogenys fusca (Blanchard) (Coleoptera: Melolontidae) com Inseticidas Aplicados nas Sementes e no Sulco de Semeadura da Soja (Glycine max)

Abstract

Control of the White Grub Liogenys fusca (Blanchard) (Coleoptera: Melolontidae) Using Insecticides on Seeds and in Soybean (Glycine max) Sowing Furrow ABSTRACT -Among soil pests that attack soybean crop, the white grubs complex has great importance during initial stage of crop development, and Liogenys fusca (Blanchard) is the most common species in Brazilian Western Central Region. The objective with this work was to evaluate the effect of some insecticides applied either to the soil or to the seed for control of L. fusca larvae in a soybean field.The study was carried out during 2006/07 crop season in Mato Grosso State, Brazil. In the furrow, the following insecticides were applied (g.ha-1): chlorpyrifos (576 and 720), endosulfan (1050), bifenthrin (40 and 60), imidacloprid (60), and fipronil (25). For seed treatment the following insecticides were applied: (g/100 kg of seeds): imidacloprid (60), clothianidin (60), fipronil (25 and 50), imidacloprid + thiodicarb (60 + 180), acephate (600) and thiamethoxam (42). Crop stand at 10 and 35 days after soybean emergency (DAE), plant height at 35 and 54 DAE and grain yield were measured to evaluate the effect of insecticides and the way of application. Chlorpyrifos (720 g.ha -1 ), endosulfan (1050) and fipronil (25), applied in the furrow, and imidacloprid (60 g.100kg -1 ), clothianidin (60) and fipronil (50), applied on seeds, provided the best initial establishment and development of the soybean crop. However there was no difference for grain yield between all insecticides applied either in soil or seeds, but these chemical treatments provided higher grain yield than the control treatment. It was concluded that insecticide application on seeds or in the furrow might be used as a strategy to larvae control of L. fusca in soybean fields. KEY WORDS -Insecta, soil pest, stand, productivity.RESUMO -Dentre as pragas de solo que atacam a soja, destacam-se as larvas rizófagas de besouros melolontídeos que podem causar danos severos nos estágios iniciais de desenvolvimento da cultura, sendo Liogenys fusca (Blanchard) (Coleoptera: Melolonthidae) a espécie mais comum na Região Central do Brasil. Objetivou-se avaliar o efeito de inseticidas aplicados nas sementes ou em pulverização no sulco de semeadura da soja visando o controle do coró L. fusca. O estudo foi conduzido durante a safra de 2006/2007, no Estado de Mato Grosso, sendo avaliados os seguintes inseticidas aplicados no sulco de semeadura: clorpirifós (576 e 720 g/ha), endosulfam (1050 g/ha), bifentrina (40 e 60 g/ha), imidacloprido (60 g/ha), fipronil (25 g/ha). Nas sementes foram avaliados os seguintes inseticidas (100 kg de sementes): imidacloprido (60), clotianidina (60), fipronil (25 e 50), imidacloprido + tiodicarbe (60 + 180), acefato (600), tiametoxam (42). Para avaliar o efeito dos inseticidas e modo de aplicação dos mesmos, avaliou-se o estande aos 10 e 35 dias após a emergência (DAE) da soja, bem como a altura das plantas aos 35 e 54 DAE e o rendimento de grãos. Clorpirifós (720 g.ha ), aplicados no sulco de ...

A taxonomic revision of Liogenys occurring in Brazil with an interactive key and remarks on New World Diplotaxini (Coleoptera, Melolonthidae)

“…Only L. fusca and L. suturalis (Blanchard) have been recorded as agricultural pests, mainly in the “Cerrado”, a Brazilian savannah biome. Liogenys fusca was found damaging corn and soybean in Mato Grosso do Sul, Mato Grosso, and Goiás States (Rodrigues et al 2008, Santos et al 2008, Costa et al 2009, Ávila et al 2014). Liogenys suturalis damages corn, wheat, and oats in Mato Grosso do Sul (Santos and Avila 2009).…”

First report of Liogenys suturalis (Blanchard) (Coleoptera: Scarabaeidae: Melolonthinae) in Argentinian crops and the first report of damage on soybean

“…bidenticeps Moser, L. concolor Blanchard, L. sinuaticeps Moser, L. fusca Blanchard and L. suturalis (Blanchard). L. fusca is responsible for yield loss mainly in soybean ( Glycine max (L.) Merr., Fabaceae) (Rodrigues et al ., 2008, 2016; Santos et al ., 2009; Cherman et al ., 2013, 2014; Ávila et al ., 2014), whereas L . suturalis is mainly in maize ( Zea mays L., Poaceae) (Santos and Ávila, 2009a; Ferreira et al ., 2018).…”

“…For most of Liogenys species, information on their bioecology, life cycle, host preference and reproductive behavior is still rare (Cherman et al, 2011(Cherman et al, , 2017. However, a few species are better known, as they became economically important due to their impact in crops as rootfeeding pests (Silva et al, 1968;Rodrigues et al, 2008Rodrigues et al, , 2014Rodrigues et al, , 2016Santos et al, 2009;Cherman et al, 2011Cherman et al, , 2013Coutinho et al, 2011;Ávila et al, 2014;Ferreira et al, 2018). Until now, five species were recorded associated with several summer and winter crops: L. bidenticeps Moser, L. concolor Blanchard, L. sinuaticeps Moser, L. fusca Blanchard and L. suturalis (Blanchard).…”

“…Until now, five species were recorded associated with several summer and winter crops: L. bidenticeps Moser, L. concolor Blanchard, L. sinuaticeps Moser, L. fusca Blanchard and L. suturalis (Blanchard). L. fusca is responsible for yield loss mainly in soybean (Glycine max (L.) Merr., Fabaceae) (Rodrigues et al, 2008(Rodrigues et al, , 2016Santos et al, 2009;Cherman et al, 2013Cherman et al, , 2014Ávila et al, 2014), whereas L. suturalis is mainly in maize (Zea mays L., Poaceae) (Santos and Ávila, 2009a;Ferreira et al, 2018). Despite the broad distribution of Liogenys throughout South America and especially that of the cited species, which occur in Brazil, Argentina, Bolivia and Paraguay, all biological aspects known are only from the Brazilian populations.…”

Identification and description of the antennal sensilla of Liogenys suturalis (Coleoptera: Scarabaeidae)

“…sinuaticeps Moser, 1918 were reported in winter grains (Cherman et al, 2011). Larvae from these species cause damage to plants roots and chemicals have been used to their control (Santos et al, 2008;Ávila et al, 2014).…”