Fitotoxicidade de herbicidas a diferentes cultivares de milho-pipoca

Freitas, S.P.; Moreira, José Genivaldo do Vale; Freitas, I. L. J.; Júnior, S. P. Freitas; Júnior, Amaral; Silva, V.Q.R

doi:10.1590/s0100-83582009000500023

Cited by 15 publications

(13 citation statements)

References 9 publications

(1 reference statement)

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“…For the evaluation of phytotoxicity the adapted scale from [10,11,12] was used, with 0 = for absence of phytotoxicity; 1–25 = light chlorosis or beginning of necrosis on the seedlings leaves; 26–50 = medium chlorosis or necrosis on the seedlings leaves; 51–75 = high chlorosis or necrosis on the seedlings leaves; and 76–100 = wilt and dryness of the plant.…”

Section: Methodsmentioning

confidence: 99%

The Efficiency of Noni (Morinda citrifolia L.) Essential Oil on the Control of Leaf Spot Caused by Exserohilum turcicum in Maize Culture

et al. 2017

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The objective of this work was to evaluate the efficiency of noni essential oil on the control of Exserohilum turcicum, a causative agent of Exserohilum spot in maize culture. In the sanitary test 400 seeds were incubated using the blotter test method. For the transmissibility test, the fragments of damaged leaves of seedlings were removed and put into a potato, dextrose and agar (PDA) culture environment. To verify the pathogenicity, Koch´s postulates were performed. In the phytotoxicity test different concentrations of noni oil were applied in maize seedlings. E. turcicum conidia were submitted to different concentrations of noni oil. In the preventive and curative tests noni essential oils were applied before and after the conidia inoculation, respectively. The results revealed the presence of fungi of the genres Aspergillus, Penicillium, Rhizopus, Fusarium, and Exserohilum in the maize seeds. The pathogenicity of E. turcicum and also the transmission of this fungus from the seeds to the maize seedlings was confirmed. The inhibition of conidia germination was proportional to the concentration increase. The preventive application of noni essential oil was the most efficient on the control of Exserohilum spot.

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Section: Methodsmentioning

confidence: 99%

The Efficiency of Noni (Morinda citrifolia L.) Essential Oil on the Control of Leaf Spot Caused by Exserohilum turcicum in Maize Culture

et al. 2017

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“…In the IAC -125 hybrid and in the UENF-14 variety, the value of Fv/Fm did not change with the application of tembotrione during the period of evaluation, and, regarding the nicosulfuron, there was no change in the values of Fv/Fm for any cultivars. Freitas et al (2009) observed that the tembotrione caused slight toxicity, in post-emergence, the more affected popcorn varieties were PA-038 (with 50% of phytotoxicity) and Viçosa-Maringá (with 18,75% phytotoxicity), but both presented fast recovery. Cavalieri et al (2008) did not observe effect on productivity due to nicosulfuron in corn hybrids, noting however that some hybrids showed phytotoxicity symptoms occurring differential tolerance among these being necessary steps to evaluate this tolerance yield.…”

Section: Resultsmentioning

confidence: 93%

“…Due to the limited information about selective herbicides for popcorn cultivation, many farmers improperly use products registered for common corn, which may not be selective to some varieties of popcorn corn (Freitas et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

Maximum quantum yield of photosystem II to assist in the measurement of herbicide selectivity in popcorn

Freitas¹,

Rodrigues²,

Amaral³

et al. 2014

Plant Sci Today

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The objective of this study was to evaluate the selectivity/phytotoxicity of herbicides (mesotrione, nicosulfuron, and tembotrione) using the maximum quantum yield of photosystem II associated with biometric analyses. The experiment was conducted using three popcorn genotypes (BRS Angela, IAC-125 and UENF-14) and three herbicides (mesotrione, tembotrione and nicosulfuron, and a control treatment "WITH WEEDING?". The quantum yield of photosystem II was obtained through a modulated light portable fluorometer MINI-PAM, from the chlorophyll a fluorescence. Regarding the biometric analyses, the following characteristics were evaluated: a) number medium of ears of the corn, b) grain yield in kg ha -1 , c) average weight of 100 grains, and d) popping expansion. The genotypes were sensitive to tembotrione with higher intensity for the IAC -125. The maximum quantum yield of photosystem II showed useful tool for studies of selectivity/phytotoxicity symptoms of herbicides used.

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“…Each vase was pulverized with 5 mL of the solutions. The evaluation was made according to the phytotoxicity scale adapted from [12] until the tenth day.…”

Section: Methodsmentioning

confidence: 99%

Essential Oil of Cymbopogon citratus on the Control of the Curvularia Leaf Spot Disease on Maize

et al. 2017

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The Curvularia Leaf Spot is becoming more common due to the culture expansion and the low resistance of the cultivated genotypes in tropical regions. Thus, the objective was to evaluate the fungitoxicity of the essential oil of Cymbopogon citratus upon the phytopathogen Curvularia lunata, causative agent of the Curvularia Leaf Spot. There was realized pathogenicity tests of C. lunata in maize plants, phytotoxicity of the essential oil of C. citratus and gas chromatography attached, germination tests of the conidia, and of in vitro inhibition of C. lunata. Also, there were realized tests aiming at verifying the phytopathogen control in vivo. In the pathogenicity tests, there were verified symptoms of the disease in all of the suspensions tested on plants. It was observed that the essential oil concentrations of 7.5 µL mL−1 to 50 µL mL−1 were phytotoxic. The majoritarian chemical components of the essential oil of C. citratus were Geranial (41.46%) and Neral (32.43%). The concentrations of 5 and 7.5 µL mL−1 inhibited 100% of conidia germination. None of the concentrations evaluated effectively inhibited C. lunata mycelial growth in in vitro tests. In the preventive control, the concentration of 7.5 µL mL−1 was sufficient for the reduction of the progress of the disease, however the curative control was not efficient on the tested dosages.

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Fitotoxicidade de herbicidas a diferentes cultivares de milho-pipoca

Cited by 15 publications

References 9 publications

The Efficiency of Noni (Morinda citrifolia L.) Essential Oil on the Control of Leaf Spot Caused by Exserohilum turcicum in Maize Culture

The Efficiency of Noni (Morinda citrifolia L.) Essential Oil on the Control of Leaf Spot Caused by Exserohilum turcicum in Maize Culture

Maximum quantum yield of photosystem II to assist in the measurement of herbicide selectivity in popcorn

Essential Oil of Cymbopogon citratus on the Control of the Curvularia Leaf Spot Disease on Maize

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