Efficacy of Trichogrammatidae Species (Hymenoptera) Submitted to the Herbicide Glyphosate

Leite, Germano Leão Demolin; Paulo, Paula Daiana de; Santos, L.D. Tuffi; Alvarenga, Anarelly Costa; Soares, M. S.; Dourado, Luan Rocha; Bispo, Edilson Paulo Rodrigues

doi:10.1590/s0100-83582019370100147

Cited by 7 publications

(2 citation statements)

References 33 publications

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“…However, the highest emergence rate of females for T. acacioi, T. atopovirilia and T. pretiosum, 12.76%, from treated eggs of the alternative host E. kuehniella with Sanson 40 SC® (a.i. nicosulfurom) post-parasitism, was due to the hormesis phenomenon [41], when sub-lethal amounts of a stressor (e.g., herbicide) actually bene t an organism [18,41,42]. The hormesis phenomenon has also been reported for T. pretiosum, T. acacioi and T. annulata in host eggs treated with Sanson 40 SC® (a.i.…”

Section: Discussionmentioning

confidence: 91%

“…atrazine) in a laboratory in Pelotas, Rio Grande do Sul state, Brazil, shows the resistance of the rst species to these herbicides [39]. This is due to the fact that T. acacioi needs a highly favorable environment and maximum vigor of its individuals to exert parasitism because it is more susceptible to pesticides [21,40,41,42] and inadapted to high temperatures [43]. In addition, parasitism by non-fed females is low, producing only males when not mated in the laboratory in Alegre, Espírito Santo state, Brazil [44].…”

Section: Discussionmentioning

confidence: 99%

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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: 91%

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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Herbicides may threaten advances in biological control of diseases and pests

Pinheiro,

Duque,

Barroso

et al. 2023

Environ Sci Pollut Res

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Control of Digitaria insularis (L.) Fedde in eucalyptus forests: shading increases sensitivity to glyphosate applied alone and in a mixture with carfentrazone-ethyl

Ferreira,

Donato,

Montes

et al. 2024

Discov Agric

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Shading, the predominant condition in most of the eucalyptus cultivation cycle, causes changes in the morphological and physiological weed's characteristics, which can alter their responses to glyphosate and carfentrazone-ethyl, important herbicides for the crop. The objective was to evaluate the influence of light on the efficiency of glyphosate and carfentrazone-ethyl used alone and in a mixture in Digitaria insularis control, a priority pest in the crop. The experiment was carried out in a 3 × 6 factorial scheme. The first factor corresponded to 3 cultivation environments (full sunlight, 45 and 63% shading) and the second factor to doses of glyphosate and carfentrazone-ethyl applied isolated (1920 and 40 g ai ha−1) and mixed (1536 + 8; 1152 + 16; 768 + 24 and 384 + 32 g ai ha−1), respectively. Shading increased D. insularis sensitivity to glyphosate alone and in a mixture with carfentrazone-ethyl. In shading, the glyphosate application alone at a dose of 1920 g ha−1 and in a mixture with carfentrazone-ethyl at doses of 1536 + 8 and 1152 + 16 g ha−1 were efficient in D. insularis control. In the environment of 63% shading, the dose of 768 + 24 g ha−1 was also efficient in this species control. None of the doses were effective in controlling D. insularis in full sunlight. Isolated carfentrazone-ethyl was inefficient in controlling D. insularis, regardless of the growth environment. Shading increases the quantum yield of photosystem II and reduces the electron transport rate, photosynthetic rate, stomatal conductance, and transpiration rate of D. insularis. In shady environments, it is possible to control D. insularis with lower glyphosate doses, used alone and mixed with carfentrazone-ethyl.

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Efficacy of Trichogrammatidae Species (Hymenoptera) Submitted to the Herbicide Glyphosate

Cited by 7 publications

References 33 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

Herbicides may threaten advances in biological control of diseases and pests

Control of Digitaria insularis (L.) Fedde in eucalyptus forests: shading increases sensitivity to glyphosate applied alone and in a mixture with carfentrazone-ethyl

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