Desenvolvimento in vitro do fungo simbionte de Atta sexdens rubropilosa Forel, 1908 (Hymenoptera: Formicidae) em meio de cultura com diferentes extratos vegetais

Souza, Marcelo Dias de; Filho, Otávio Departamento de Engenharia Florestal Peres; Caldeira, Sidney Fernando; Dorval, Alberto; Sousa, Nilton José

doi:10.1590/s0103-84782012005000058

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…Therefore, the extract of Musa acuminata was efficient since other authors such as Souza et al (2012) and Jung et al (2013) obtained satisfactory results in a longer period of time. These authors tested different methods of obtaining extracts in a period of 20 days (Atta sexdens) and five days (Atta laevigata), respectively.…”

Section: Resultsmentioning

confidence: 88%

Musa acuminata pseudostem extract on the control of Atta sexdens rubropilosa

Silva¹,

Camargo²,

Sanches³

et al. 2019

Biosci. J.

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Currently, few active principles are authorized by the forest certification for the control of insect pests, with which it is necessary to develop new products, mainly aiming at lower environmental impact. The plants are able to develop substances called secondary metabolites, widely studied as an alternative form of pest control. Thus, the objective of this study was to evaluate the insecticidal potential of two Musa acuminata extracts, on the control of Atta sexdens rubropilosa. The extracts were obtained from the pseudostem of M. acuminata, which underwent drying and milling, producing two extracts: ethanolic (A1) and hydroethanolic rotaevaporate (A2) extract. For the analysis of the bioactivity of the extracts, a topical application of one milliliter of each extract on the ants was carried out, with the aid of spray, in the concentrations of: 2, 6, 10, 14, 18, and 20%, with distilled water (witness) applied to the test, analyzing the mortality and LC 50 , in different evaluation periods. At 24 hours the mortality of 90% at the concentration of 20% for the A1 extract was observed. From the 10% concentration there was 100% mortality in this same period for the A2 extract, and at 48 hours the 2% concentration caused 100% mortality. In the LC 50 analysis for 24 hours values of 7.94 and 1.09% were obtained for ethanolic extract and rotavaporated ethanolic extract respectively. And the LC 50 presented a decrease in values after 48 hours for the ethanolic extract presented value of 2.29%. Thus, it can be concluded that the A2 extract is the most efficient, since it allows the lower consumption of extract in the dilution for later application, due to the presence of insecticidal potential in low concentration.

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Section: Resultsmentioning

confidence: 88%

Musa acuminata pseudostem extract on the control of Atta sexdens rubropilosa

Silva¹,

Camargo²,

Sanches³

et al. 2019

Biosci. J.

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“…However, the chemical control may cause detrimental effects on the environment and to men; as a result, sulfluramid, the principal compound now used, is about to be prohibited (STOCKHOLM CONVENTION, 2008). Hence, research has advanced in the quest for insecticides collected from toxic plants supposed to be less aggressive to the milieu (BUENO; BUENO, 2011) but harmful to leaf-cutting ants (GANDRA et al, 2011;SOUZA et al, 2012;GOMES et al, 2016). The application of their extracts is made directly on the fungus developed in culture media or on the ants themselves (BUENO et al, 2004;FRANCO et al, 2013;SANTOS et al, 2013;MORAIS et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

<i>Leucoagaricus gongylophorus</i> provides protection for </i>Atta sexdens</i> against plant extracts

et al. 2022

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Plant extracts have been considered for the control the leaf-cutting ants. The objectives of this study were to evaluate the survival leaf-cutting worker ants after topical application of Ageratum conyzoides (mentrasto) and Manihot esculenta (cassava) extracts; and to evaluate the effect of Manihot esculenta hexane extract via ingestion on the survival of the workers of Atta sexdens Forel 1908 isolated or not from their colonies, in order to verify whether the symbiotic fungus Leucoagaricus gongylophorus confers protection to the workers against the extract. First, ten medium workers were removed from their colonies and received the application of 1 μL of extract on the pronotum. The cassava extract (125 µg.mL-1) was diluted in a solution of honey with water for the ingestion bioassay. Five repetitions (ten ants inside a transparent plastic container) were performed in each of the four colonies used in the experiment. The numbers of dead ants were recorded daily until the control also died. The solution of the hexane Manihot esculenta extract gave a significant result at the concentration of 100 µg.mL-1, with 100% of mortatily after 4 days. The ants maintained with the symbiont fungus that ingested the cassava hexanic extract showed a lower mortality rate (40% at the end of 25 days) than the workers who were kept isolated (90%). The symbiosis between the ants and the fungus means more than a food source for leaf-cutting ants because it reduces the toxic effect on the ants when the ants remain in contact with the fungus and is offered an unsafe vegetable.

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