Manejo de Diaphorina citri (Hemiptera: Psyllidae) com redução no volume de aplicação e uso de adjuvante agrícola

• Ano de defesa: 2024
• Autor(a) principal: Gonçalves, Rafael Andrade [UNESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Psilideo dos citros; Controle químico; Pulverização; Adjuvantes
• Link de acesso: https://hdl.handle.net/11449/257161

With the increase in applications to control the insect Diaphorina citri Kuwayama (Hemiptera: PSYLLIDAE), vector of bacteria associated with HLB, the probability of selecting insecticide-resistant populations is high, generating serious negative effects on the environment, in addition to resulting in inefficiency in control and economic losses. Given this scenario, this study aimed to evaluate the interaction between three chemical insecticides, associated or not with adjuvants, with and without the aid of the electrostatic application system, in the control of Diaphorina citri, aiming to maintain the effectiveness of the products and the cultural economic strategy. Initially an experiment was conducted in the Application Technology Research Laboratory (PROTEC) and greenhouses at UNESP, Botucatu Campus, and was later transferred to the field, with seven treatments and four replications, without comparing different application technologies. In addition, two field experiments were carried out in the Socorro and Mogi-Mirim, SP, cities both in a randomized block design (DBC), where each infested branch in each treatment period represented one replication, totalling six per treatment. Efficiency evaluations were carried out in different periods of infestation, in order to observe the residual period of treatments. For this, citrus plants were sprayed and infested at three different periods: 0, 7 and 14 days after application (DAA). The new branches containing shoots were surrounded by cages made from organdy fabric and infested with 10 adult psyllids aged 2-3 days. Survey mortality was assessed with 1, 3, 5 and 7 days after confinement. Data obtained in all assays were subjected to normality (Shapiro-Wilk) and homogeneity (Levene) tests. When normality was not achieved, data were analyzed using the Kruskal-Wallis-Ranks test (P>0.05) to compare medians, using the statistical program PROC MIXED-SAS 9.2 (SAS Institute, 2001). Based on the study results, different active ingredients and application technologies affect the efficiency control of Diaphorina citri. Insecticide mixtures such as abamectin plus cyantraniliprole and acetamiprid plus bifentrine were more effective than imidacloprid. Electrostatic application, especially with adjuvants, provided uniform distribution of insecticides on the leaves but the persistence of insecticides after application is crucial for long-term results. The presence of crop spray adjuvant improved the control efficiency in some cases. The appropriate selection of active ingredients, application technologie and adjuvants is essential for efficient D.citri control strategies aiming at sustainable pest management and maximizing the citrus orchards production.