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Master's Dissertation
DOI
https://doi.org/10.11606/D.64.2021.tde-19112021-121319
Document
Author
Full name
Juliana Carla Fontes
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
Piracicaba, 2021
Supervisor
Committee
Tornisielo, Valdemar Luiz (President)
Guimarães, Ana Carolina Dias
Rocha, Aderbal Almeida
Title in Portuguese
Comportamento do inseticida tiametoxam aplicado via drench em plantas de tomate
Keywords in Portuguese
Absorção
Anteras
Contaminação
Flores
Translocação
Abstract in Portuguese
A produção de tomate demanda um intenso cuidado fitossanitário. O tiametoxam se destaca por sua eficiência em combater as principais pragas do tomateiro, inclusive vetores de vírus que podem comprometer toda a produção. O objetivo deste estudo foi explorar a sistemicidade do tiametoxam, aplicado via drench, em diferentes estádios de desenvolvimento do tomateiro, para compreender o potencial de absorção, translocação e acúmulo da molécula inseticida nas flores e anteras da cultura, uma vez que as matrizes polinizadoras podem ser um dos meios de contaminação para insetos polinizadores. A absorção e translocação do 14C-tiametoxam foi monitorada em plantas de tomate cultivadas em câmara de crescimento. A principal variável desse estudo foi a época de aplicação, já que as plantas de tomate foram tratadas com doses iguais, em três diferentes condições: aplicação única, em duplicata e em triplicata, iniciando no plantio com intervalos de 14 dias. As avaliações foram realizadas em cinco pontos, durante dois meses de cultivo, com foco no florescimento da cultura. O tiametoxam apresentou comportamento sistêmico em tomate-cereja. As plantas mantiveram acumulado, o máximo de 5% do inseticida, ao longo do ciclo. À medida que as plantas foram se desenvolvendo, o tiametoxam já presente na planta foi se distribuindo por toda matéria vegetal disponível. As flores e anteras apresentaram níveis residuais da molécula a níveis baixos, porém persistentes. Em aplicações parceladas observou-se maior persistência da radioatividade ao longo do tempo, inclusive no residual de tiametoxam das flores e anteras, comprovando o potencial de contaminação do tiametoxam em anteras e grãos de pólen, devido ao alto potencial de translocação do inseticida
Title in English
Behavior of thiamethoxam insecticide applied via drench on tomato plants
Keywords in English
Absorption
Anthers
Contamination
Flowers
Translocation
Abstract in English
Tomato production requires intense plant-health treatments. Thiamethoxam stands out for controlling the main tomato pests, including virus vectors that can affect the entire production. The aim of this study was to explore the systemic approach of thiamethoxam, applied via drench, at different growth stages of tomato, to better understand the potential for absorption, translocation and accumulation of the insecticide molecule in the flowers and anthers of the crop, since the pollinating matrices can be one key contamination for pollinating insects. The absorption and translocation of 14C-thiamethoxam was monitored in tomato plants cultivated in a growth chamber. The main variable of this study was the application timing, since the tomato plants were treated with equal doses, in three different conditions: single, duplicate, and triplicate application, starting at planting with 14 days intervals. The evaluations were carried out at five points, during two months of cultivation, with focus on the flowering of the culture. Thiamethoxam showed systemic behavior in cherry tomatoes. The plants maintained a maximum of 5% of the insecticide accumulated throughout the cycle. As soon as the plant developed, the thiamethoxam already inside were distributed throughout all available plant matter. The flowers and anthers showed low residual levels of the molecule, but persistent. In divided applications, higher persistence of radioactivity over the time was observed, as the residual thiamethoxam of flowers and anthers, proving the potential for thiamethoxam contamination in anthers and pollen grains, due to the high potential for translocation of the insecticide
 
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Publishing Date
2021-11-29
 
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