Resumo - Abstract -Alternatives for volunteer corn RR® management need further knowledge in the product scope with residual effect, mainly for use in pre-emergence of the soybean RR ® . This paper evaluated the performance of residual herbicides to control this species, when applied in soybean using the method "plant-apply". The experiment was carried in the municipality of Santa Maria/RS, crop season 2015/16; evaluating herbicides applied in pre-emergence of soybean crop and corn RR ® . The experimental design was randomized blocks with eight treatments and four replications were evaluated inhibition of emergence of corn plants and injury on emerged plants. Sequential application responses were also addressed. Herbicides tested: flumioxazin, chlorimuron-ethyl, imazaquin, and sulfentrazone; as associations these herbicides with flumioxazin, in sequential applications, reporting if there were synergistic effects. The best control of RR ® volunteer corn was obtained with the imazaquin herbicide, which reduced the emergence of RR ® corn plants by 90% and injured 97.5% of those that emerged. However, imazaquin caused symptoms of 1 Recebido para publicação em

Eleusine indica (L.) Gaertn. (goosegrass) is a grass species that has global prominence as a weed in areas typical of the soybean crop. However, its dispersion in recent years has been reported expressively for areas of poorly drained soil, in which irrigated rice is cultivated (lowlands). Little is known on its behavior and biology in this different ecosystem. This study aimed to evaluate if Eleusine indica can survive and withstand flooding. The experimental design was a completely randomized (two-way), in which two E. indica biotypes, one from the uplands (without flooding) and the other from the lowlands (with flooding), were submitted to three soil water conditions: 50 and 100% water retention capacity and soil under water depth. Photosynthetic and gas exchange parameters (photosynthetic rate, stomatal conductance, intercellular CO2 concentration, transpiration, water use efficiency, and assimilation rate by Rubisco) were determined. Morphological diversity of biotypes was evaluated through descriptors. The existence of typical lowland biotype could not be characterized. However, both biotypes were able to survive, develop, and generate seeds in a flooded environment in the irrigated rice system.

Os herbicidas inibidores da ACCase vêm sendo empregados no controle de milho voluntário resistente ao glifosato, muitas vezes associados à mimetizadores de auxinas. O objetivo deste estudo foi avaliar o efeito das associações entre herbicidas inibidores de ACCase e mimetizadores de auxinas no controle de milho resistente ao glifosato. O delineamento experimental foi de blocos casualizados com nove tratamentos e quatro repetições, sendo os tratamentos: T1 testemunha; T2 clethodim + 2,4-D amina (120 + 1209 i.a.); T3 clethodim + triclopir (120 + 720 i.a); T4 haloxifop-methyl + 2,4-D amina (60 +1209 i.a); T5 haloxifop-methyl + triclopir (60 + 720 i.a); T6 2,4-D amina (1209 i.a); T7 triclopir (720 i.a); T8 clethodim (120 i.a.) e T9 haloxifop-methyl (60 i.a.). A semeadura do milho voluntário ocorreu de maneira artificial, utilizando a cultivar 30B39HR. A aplicação dos tratamentos ocorreu com o auxílio de um pulverizador pressurizado Co2 no estágio V5 das plantas. Foram realizadas avaliações de controle visual aos 7, 14 e 21 dias após a aplicação e, também, estimou-se a correlação entre as avaliações, o efeito esperado e observado das misturas de herbicidas. Observou-se que a associação de haloxifop-methyl e 2,4-D amina apresentou antagonismo nas doses testadas para controle de milho resistente ao glifosato. A associação clethodim + triclopir (120 + 720 i.a.) apresentou o melhor resultado de controle do milho voluntário, cultivar 30B39HR, e atingiu valores superiores ao controle esperado. Portanto, a associação de herbicidas pode ser uma ferramenta no controle de milho voluntário resistente ao glifosato.

The low Brazilian productive index and the high demand have aroused interest in the cultivation of lentils, however the legume is little known and needs further studies. The objective of this study was to analyze and identify the effects of treatments with insecticides and fungicides on the physiological quality of lentil seeds, CA-1512 strain. The experiments were conducted in the seed laboratory in a completely randomized design with seven treatments and four replicates. Seed treatment with Thiophanate-methyl; Fluazinam® (180 ml) + Pyraclostrobin; Thiophanate-methyl; Fipronil® (150 ml) promoted higher levels of germination under accelerated aging, lower number of abnormal seedlings and longer lengths of shoot and radicle for the emergence in paper. Treatment with Carboxin; Thiram® (250 ml) + Imidacloprid® (150 ml) allowed a higher value in the first count of germination in sand, lower number of dead seeds under accelerated aging and longer root length, in the emergence in sand. Shoot length in the emergence in sand increased after seed treatment with Metalaxyl-M; Fludioxonil® (75 ml) + Pyraclostrobin; Thiophanate-methyl; Fipronil® (150 ml). Treatments with fungicides and insecticides considerably improved the physiological properties of the seeds, thus being able to guarantee greater phytosanitary qualities in the field, generating healthier seedlings and with protection against possible pests and diseases, and consequently guaranteeing greater productivity.