The effects of sublethal drift rates and carryover of glyphosate and dicamba into the next generation of seed potato cultivars Atlantic and Dakota Pearl are unknown. The objective of this research is to determine the impact of sublethal glyphosate and dicamba rates on mother and daughter chipping potato plants. Field studies were conducted in 2018 and 2019 in Oakes, ND. Herbicides were sprayed at the tuber initiation stage and consisted of dicamba (0, 20, and 99 g ae ha-1) and glyphosate (0, 40, and 197% g ae ha-1). During the year of application (2018), the combination of glyphosate at 197 g ha-1 and dicamba at 99 g ha-1 resulted in a 40% yield reduction compared to the non-treated in both cultivars. In 2019, the daughter tubers from mother tubers that were treated with glyphosate (23%) experienced a 16% reduction in marketable yield in both cultivars.

Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2015-05-26T13:09:56Z No. of bitstreams: 2 Dissertação - Patrícia Aparecida de Carvalho Felisberto - 2015.pdf: 5137723 bytes, checksum: 1a2d107b747e1e556b5cc29325451197 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2015-05-26T13:14:03Z (GMT) No. of bitstreams: 2 Dissertação - Patrícia Aparecida de Carvalho Felisberto - 2015.pdf: 5137723 bytes, checksum: 1a2d107b747e1e556b5cc29325451197 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Made available in DSpace on 2015-05-26T13:14:03Z (GMT). No. of bitstreams: 2 Dissertação - Patrícia Aparecida de Carvalho Felisberto - 2015.pdf: 5137723 bytes, checksum: 1a2d107b747e1e556b5cc29325451197 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2015-02-23 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / In the field aerial application of sugarcane ripeners, spraying should reach its target without drifting occurs, avoiding contamination of surrounding crops. The aim of this research was to evaluate the effects of sugarcane ripeners simulated drift using sublethal rates in maize when applied to V4 and V8 stages of development. For this purpose were installed two trials on the Federal University of Goiás, Regional Jataí. Each plot contained 10 rows of SYN 7G17 maize hybrid. Each trial consisted of eight treatments established in design with randomized blocks where the treatments were arranged at factorial design of 2 x 4, plus one control treatment, with four replications. First factor corresponds to spraying at the V4 and V8 stages of maize and the second factor to sublethal rates of 3; 6; 9 to 12% of 475.2 g a.i. ha-1 ethephon (Trial I), 216.0 g a.e. ha-1 glyphosate (Trial II) and 15.0 g a.i. ha-1 sulfometuron methyl (Trial III). At 20 and 36 days after sowing, when the maize were in V4 and V8, respectively, applications of ripeners were performed.The phytotoxicity effects were noticeable in both stages at 7, 14, 21, 28 and 42 days after spraying only for Trial III. For glyphosate, the length and diameter of ear were reduced in size to both stages. Maize is sensitive to sublethal rates starting from 0.45 g a.i. ha-1 sulfometuron methyl in V4 and V8 stages of development. The lower grain yield was only to plants subjected to sublethal doses of sulfometuron methyl, being lower yield when drift occurs in the V8 stage of development compared to the V4 stage. / Na aplicação aérea de maturadores de cana-de-açúcar, a pulverização deve atingir o seu alvo sem que ocorra deriva, evitando a contaminação de culturas circunvizinhas. Objetivou-se com a pesquisa avaliar o efeito de subdoses de maturadores de cana-de-açúcar na cultura do milho quando aplicadas em estádios de desenvolvimento V4 e V8. Foram instalados três ensaios na Fazenda da Universidade Federal de Goiás, UFG, Regional Jataí. Cada parcela continha 10 linhas do híbrido de milho SYN 7G17. Cada ensaio foi constituído de oito tratamentos estabelecidos em delineamento com blocos casualizados em esquema fatorial 2 x 4 mais um tratamento controle (sem aplicação de maturador), com quatro repetições. O primeiro fator corresponde a aplicação nos estádios V4 e V8 da cultura do milho e o segundo fator às subdoses de 3; 6; 9 e 12% de 475,2 g i.a. ha-1 de ethephon (Ensaio I), 216,0 g e.a. ha-1 de glyphosate (Ensaio II) e 15,0 g i.a. ha-1 de sulfometuron methyl (Ensaio III). Aos 20 e aos 36 dias após a semeadura, quando as plantas de milho se encontravam em V4 e V8, respectivamente, foram realizadas as aplicações dos maturadores. Os efeitos de fitotoxicidade foram perceptíveis em ambos os estádios aos 7, 14, 21, 28 e 42 dias após a aplicação apenas para o Ensaio III. Para glyphosate, o comprimento e diâmetro de espigas foram afetados para ambos os estádios. A cultura do milho é sensível a subdoses a partir de 0,45 g i.a. ha-1 de sulfometuron methyl em estádios de desenvolvimento V4 e V8. A produtividade de grãos foi menor apenas para as plantas submetidas às subdoses de sulfometuron methyl, com menos efeito quando a deriva ocorre no estádio de desenvolvimento V8 em comparação ao estádio V4.

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