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Master's Dissertation
DOI
https://doi.org/10.11606/D.11.1982.tde-20220207-181906
Document
Author
Full name
Alci Enimar Loeck
Institute/School/College
Knowledge Area
Date of Defense
Published
Piracicaba, 1981
Supervisor
Title in Portuguese
Efeito de novas substancias visando o controle das saúvas atta spp (Hymenoptera-Formicidae)
Keywords in Portuguese
CONTROLE QUÍMICO
FORMIGAS CORTADEIRAS
INSETICIDAS
SAÚVAS
Abstract in Portuguese
Com o objetivo de verificar a ação de novas substâncias, comparadas com a do padrão (dodecacloro), no controle de saúvas, em forma de isca, são experimentados o oxicloreto de cobre, diflubenzuron, methoprene, deltamethrin e endossulfan. Em laboratório, o methoprene 9 e 18 ppm não produziu efeito deletério às formigas. O diflubenzuron, nas concentraçoes de 9 e 18 ppm, apresentou controle de 100%, porém, sua eficiência no campo foi diminuída para 14 e 71%, respectivamente. O dodecacloro, mesmo na concentração de 0,25% mostrou 100% de controle. O deltame- thriu somente foi aceito pelas formigas em concentrações menores que 10 ppm, dose considerada insuficiente paraexercer qualquer dano. O endossulfan 0,45% apresentou efeito muito drástico, matando as formigas por contato. O oxicloreto de cobre 0,05% exerceu controle de 100% sobre formigueiros de laborat6rio, mas a sua ação foi muito lenta, sendo mais rápida com doses crescentes. No campo somente exerceu controle a partir da concentração de 0,105%. Concentrações maiores apenas abreviaram o início da atuação, sendo o resultado final praticamente o mesmo, que foi da ordem de 70%. Estudos detalhados sobre um formigueiro de Atta sexdens rubropilosa Forel, 1908, com oito meses de idade, em laboratório, revelaram que há um efeito tóxico cumulativo do cobre nas saúvas, atingindo inicialmente a casta dos indivíduos menores. O exame de outro sauveiro da mesma espécie, com três anos de idade, ainda no campo, revelou que os materiais introduzidos no interior do ninho, pelos diferentes canais de abastecimento, não são igualmente distribuídos em todas as panelas onde o fungo e cultivado.
Title in English
Effects of news substances for controlling leaf-cutting ants atta spp (Hymenoptera-Formicidae)
Abstract in English
This research deals with the control of the leaf-cutting ants atta spp by comparing a standart bait (dodecachlor) with baits made of copper oxychloride, diflubenzuron, methoprene, deltame·thrin and endosulfan. ln the laboratory the methoprene bait, at the concentraxions of 9 and 18 ppm, did not show any deleterious effect against the ants the diflubenzuron bait, at the concentrations of 9 and 18 ppm gave a 100% control but its efficiency in the field decreased 14% and 71%, respectively; the dodecachlor bait, even at 0.25% concentration gave a 100% control. The deltamethrin bait was accepted by the ants only when the concentrations were lower than 10 ppm, a dosis which is considered insufficient to cause any harm to the ants. The endosulfan bait, at the concentration of 0.45% showed a highly drastic effect killing the ants by contact; the copper oxychloride bait, at concentration of 0.05% gave a 100% control of the ant nests in the laboratory but its action was too slow, being faster with increasing dosis, and in the field it controlled the ants from 0.105% concen- tration on, whereas higher concentrations have only abbreviated the beginning of the lethal action and the final result was practically the sarne (around 70% of control). The detailed studies of an 8-month old colony of Atta sexdens rubropilosa Forel, 1908, in laboratory, indicated that there is a direct cumuJative toxic effect of the copper on the ants by killing initially the caste of the srnaller individuals. The observations of a·3-year old colony, of the sarne ant species, in the field, indicated that the materials brought into the nest through the different channels of supplying are not equally distributed in all the nest chambers where the fungus is grown
 
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Publishing Date
2022-02-07
 
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