Controle de Cosmopolites sordidus (Coleoptera:Curculionidae) com os fungos entomopatogênicos Beauveria bassiana e Metarhizium anisopliae em banana

Abstract

Resumo: O uso contínuo de agrotóxicos promove uma redução rápida e eficaz das pragas, contudo, esta prática acarreta nas pragas a possibilidade de desenvolver resistência, sujeitando o agricultor a mudar constantemente de produto, aumentar a dose ou até mesmo misturar ou usar produtos ainda mais tóxicos. Sendo Cosmopolites sordidus um coleóptero de hábitos noturnos que prejudica a bananeira, pois suas larvas abrem galerias no seu rizoma e na parte inferior do pseudocaule, acarretando em declínio, tombamento e morte da planta. Em vista disso e da própria conscientização da população para este problema maior tem sido a participação da agricultura orgânica na oferta de alimentos. Abstract:The continuous use of pesticides promotes rapid and effective reduction of pests, however, this practice entails the pests the possibility of developing resistance by subjecting the farmer to change product constantly increase the dose or even mix or use more toxic products. Being Cosmopolites sordidus one beetle nocturnal that affect the banana tree because their larvae open galleries in its rhizome and lower pseudostem, resulting in decline, overturning and death of the plant. In view of this and the population's awareness of this problem, the greater has been the participation of organic agriculture in food supply. In this context, this study aimed to evaluate the effect of two entomopathogenic fungi in control of C. sordidus in banana cultivation. The trial was held in lot E-104, the Irrigated Perimeter of Baixo Acaraú, in Marco, Ceará state. The statistical design was completely randomized, in factorial 2 x 5, two fungi (Beauveria bassiana and Metharizium anisopliae) in five concentrations (0, 5, 10, 15 and 20 g L -1 ), 5 repetitions each. We evaluated the number of insects for bait in each evaluation and the total number of captured insects. It was found that the fungus B. bassiana was more effective in controlling C. sordidus. It was also observed that the higher concentrations of 10, 15 and 20 g L -1 were more effective. We conclude that the biological control with B. bassiana can be used, as is shown adapted to climatic conditions in the study area.

Use of bioinsecticide and sugarcane molasses in the management of Cosmopolites sordidus (Germar) and Metamasius spp. (Horn)

“…According to Moreira et al (2017) successive collections of C. sordidus are important for the number of insects that are removed from the banana cultivation area. For these authors, the use of baits made from the pseudostem is also an important practice in the management of C. sordidus and can be recommended for small properties.…”

“…They concluded that the transmission of the pathogen was more efficient in the area with the presence of the two weevil borers and M. hemipterus contributed to the spread of B. bassiana in the population of C. sordidus. Moreira et al (2017) concluded that the biological control of C. sordidus with the fungus B. bassiana was more effective than with Metarhizium Anisopliae, especially at the concentration of 20 g L-1. However, the producer needs to be aware that its application should begin before the pest is established in the crop.…”

Olfactory Attraction of Rhizome Borer (Coleoptera: Curculionidae) to Banana Genotypes Inoculated with Entomopathogenic Fungus

“…The use of systemic insecticides is considered one of the main forms of control for this pest [3]. However, one of the major problems encountered in chemical control is the translocation of the active ingredient of these insecticides via sap to the fruits, which are mostly marketed "in natura" [4]. In this context another form of control which has been widely used is the use of attractive baits, produced with pieces of pseudostem split in half.…”

Selecting native entomopathogenic fungi against Cosmopolites sordidus (Germar) in the laboratory

“…Sorokin have been shown to be the most promising biocontrol agents against BRB due to their cosmopolitan distribution and high lethality caused by their production of mycotoxins and growth which blocks the insect's digestive tract (TINZAARA et al 2015, SALUSTINO et al 2019). These species are reported to cause infections for more than 300 species of pest insects (MOREIRA et al 2017), which implies that this high genetic variability should be studied in order to select efficient entomopathogenic fungi adapted to the conditions where it is necessary to control BRB. Furthermore, the discovery of new native isolates with high virulence and infectivity can add value to biological control methods by reducing production costs and the use of conventional insecticides in banana fields (MEMBANG et al 2020).…”