Chemical control of stalk regrowth in glyphosate-resistant transgenic cotton

Ferreira, A. C. de B.; Bogiani, Júlio César; Sofiatti, Valdinei; Filho, J. L. da Silva

doi:10.1590/1807-1929/agriambi.v22n8p530-534

Cited by 8 publications

(11 citation statements)

References 14 publications

(14 reference statements)

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“…The expiration of patents has increased the number of commercial herbicide products in Brazil [13,14,26,27], where crop management aims to reduce the amount of a.i. applied per hectare through the use of modern cultivation techniques, including the no-tillage system and transgenic plants [28]. The sugarcane borer, Diatraea saccharalis (F., 1794) (Crambidae), Dichomeris famulata Meyrick, 1914 (Gelechiidae), the corn earworm, Helicoverpa zea (Boddie, 1850) (Noctuidae) and S. frugiperda, are the main lepidopteran defoliators in maize crops in Brazil, and several species of Trichogrammatidae are used in the biological control of their eggs [29].…”

Section: Discussionmentioning

confidence: 99%

High Tolerance of Trichogramma Pretiosum (Hymenoptera: Trichogrammatidae) to the Mixture of the Herbicides Nicosulfuron Plus Atrazine

Leite¹,

Cordeiro²,

Santos³

et al. 2020

Preprint

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Background: Maize, Zea mays (Poaceae), is one of the most important crops in the world, but defoliating caterpillars (Lepidoptera) and weeds can reduce the productivity of this plant. The control of weeds in the maize crop in Brazil is mainly accomplished with nicosulfuron- and atrazine-based herbicides, and of lepidopteran pest eggs with use of several species of Trichogrammatidae (Hymenoptera) parasitoids released. The objective of this study was to evaluate the rates of parasitism and emergence of females and the sex ratio (%) of 10 Trichogrammatidae species, in a free-choice test, submitted to a mixture of the herbicides Sanson 40 SC® (a.i. nicosulfuron; dose: 30 g.ha–1) + Gesaprim 500 Ciba-Geigy® (a.i. atrazine; dose: 1500 g.ha–1) in the laboratory.Results: The parasitism rate (%) of Trichogramma acacioi Brun, Moraes & Soares, Trichogrammatoidea annulata de Santis, Trichogramma atopovirilia Oatman & Platner, Trichogramma bennetti Nagaraja & Nagarkatti, Trichogramma brunni Nagaraja, Trichogramma brasiliensis Ashmead, Trichogramma demoraesi Nagaraja, Trichogramma galloi Zucchi, and Trichogramma soaresi Nagaraja was lower with the herbicide mixture of nicosulfuron + atrazine than the control and, therefore, this mixture was considered to be slightly harmful (i.e., class II of the International Organization for Biological and Integrated Control) to these parasitoids. This solution reduced the emergence rate (%) of female T. acacioi, T. annulata, T. atopovirilia, T. bruni, T. brasiliensis, T. demoraesi, T. galloi, and T. soaresi, being classified as harmless to T. soaresi, moderately harmful to T. galloi and slightly harmful to the other species. The herbicide mixture of nicosulfuron + atrazine reduced the sex ratio of T. acacioi, T. atopovirilia, T. bruni, T. demoraesi, T. galloi, and T. soaresi, being classified as harmless to T. annulata and T. brasiliensis, and slightly harmful to the other species.Conclusions: The biological parameters (i.e., rates of parasitism and emergence and the sex ratio) of T. pretiosum, followed by T. bennetti, T. annulata and T. brasiliensis were the least affected by the herbicide mixture. These species should be chosen for release, on pieces of paperboard with parasitized E. kuehniella eggs, in crops together with the application of nicosulfuron + atrazine.

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Section: Discussionmentioning

confidence: 99%

High Tolerance of Trichogramma Pretiosum (Hymenoptera: Trichogrammatidae) to the Mixture of the Herbicides Nicosulfuron Plus Atrazine

Leite¹,

Cordeiro²,

Santos³

et al. 2020

Preprint

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“…This may be related to the fact that glyphosate in combination with 2,4-D has a synergistic effect, which has already been observed in the control of several weeds (Takano et al, 2013;Osipe et al, 2017). Ferreira et al (2018) found that two sequential applications of 2,4-D, each with 1,000 g e.a. ha -1 , resulted in improved control of glyphosateresistant cotton stalks, reaching 95%.…”

mentioning

confidence: 83%

“…The exclusive use of the chemical method through the application of herbicides does not always result in effective control of the stalks, since after harvest the leaf area of cotton plants is minimal and plants are usually under water stress, situations that make herbicide absorption very limited. A single application of glyphosate or 2,4-D usually does not control the sprouts of cotton stalks, requiring sequential applications (Corrêa and Gomes, 2005;Silva et al, 2015;Ferreira et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Association of Mechanical and Chemical Methods for Cotton Stalk Destruction

et al. 2019

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The destruction of cotton stalks after harvesting is a prophylactic measure aimed at reducing the population of insects and disease inoculants that may remain in the crop residues and remaining cotton plants. The objective of this work was to evaluate integrated methods of management of the cotton stalks, combining mechanical and chemical control, to promote the eradication of cotton stalks. A 7x5 factorial experiment was installed where seven different methods of mechanical control of cotton stalk and five herbicide treatments were tested. The percentage of control (visual scale of 0 to 100%) and the number of plants regrowth per meter were evaluated at 14, 28 and 50 days after herbicide application treatment. At the end of the experiment, the size of the regrowth was evaluated at 50 days. The methods of management with mowing associated with an application on the stalk followed by another application to plant regrowth’s and mowing with two sequential applications in the sprouts, for the herbicidal treatments 2,4-D + glyphosate in association with [imazapic + imazapyr]) or saflufenacil, promoted the highest control rates of cotton stalks. Aiming at the effectiveness and speed of control, the management with the application of the treatment with 2,4-D + glyphosate + saflufenacil on the stalk, after mowing, associated to another application in the regrowth, provided 100% control at 14 days after the last application and totally inhibited the regrowth of the stalks, and was considered the most effective in the destruction of cotton stalks.

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“…The most commonly used herbicides for chemical cotton stalk destruction are 2,4-D and glyphosate, mostly because both are systemic in plants and present limited residual effect in soil (Ferreira et al, 2018). Systemic herbicides like these may reach the terminal root and shoot growth areas , which is essential to control perennials, and provide an important tool when herbicides are sprayed on stem sections (right after mechanical mowing) or on very limited leaf area after crop harvest (Lemon et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Mowing Associated to Chemical Control for Glyphosate-Resistant Cotton Stalk Destruction

Braz

Junior²,

Nicolai³

et al. 2019

Planta daninha

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Post-harvest cotton stalk control is mandatory in many cotton producing countries, and the major methods used for this practice are mechanical and chemical (glyphosate and 2,4-D as the most usual herbicides applied), or a combination of both. However, the adoption of glyphosate-resistant cotton varieties by growers have required the development of alternative chemical treatments. Six trials were conducted to evaluate systems combining mowing and chemical control of glyphosate-resistant cotton stalks. Experiments conducted in 2014 were installed in randomized complete block design with nineteen treatments and four replicates. In 2015, the experiments were also conducted in randomized complete block design with eleven treatments and four replicates. Herbicide treatments were applied after cotton stalk mowing. Cotton stalk control varied according to rainfall regime after herbicide application. A single herbicide application to stub regrowth plants did not provide acceptable efficacy in cotton stalk destruction, independently of the treatment used. The best options for glyphosate-resistant cotton stalk control consisted of 2,4-D application immediately after mowing, followed by sequential application of combinations of 2,4-D with flumiclorac, carfentrazone or imazethapyr.

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Chemical control of stalk regrowth in glyphosate-resistant transgenic cotton

Cited by 8 publications

References 14 publications

High Tolerance of Trichogramma Pretiosum (Hymenoptera: Trichogrammatidae) to the Mixture of the Herbicides Nicosulfuron Plus Atrazine

High Tolerance of Trichogramma Pretiosum (Hymenoptera: Trichogrammatidae) to the Mixture of the Herbicides Nicosulfuron Plus Atrazine

Association of Mechanical and Chemical Methods for Cotton Stalk Destruction

Mowing Associated to Chemical Control for Glyphosate-Resistant Cotton Stalk Destruction

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