Acción de inhibidores de la síntesis de la quitina en la reproducción de Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae)

Lyra, Jairo Roberto Mendonça; Ferraz, J. M. G.; Silva, Ana P. P.

doi:10.1590/s0301-80591998000400009

Cited by 7 publications

(4 citation statements)

References 8 publications

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“…To mitigate the economic losses caused by ticks, new management strategies and technologies have been developed. Initially, the use of larvicides as food additives for parasite control became common [11].Then, the knowledge of the mechanisms involved in the insects´ molting process led to the development of insect growth inhibitors (IGRs), causing physiological and morphological modifications by the chitin synthesis inhibition during the insects´ immature stage [12].…”

Section: Introductionmentioning

confidence: 99%

Diflubenzuron Effectiveness in Cattle Tick(Rhipicephalus Boophilus microplus) Control in Field Conditions

Andreotti

Garcia²,

Matias³

et al. 2015

Pharm Anal Acta

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Considerable economic losses are currently caused by Rhipicephalus microplus, a cattle ectoparasite occurring in tropical and subtropical areas. Significant efforts to control this tick are made in most of the bovine producing countries, mainly with acaricides. Chemical control, albeit predominant, has been hampered by poor utilization of active principles, leading to development of resistance. This work has the objective of evaluating the diflubenzuron activity as a larvicide in cattle tick control in the field conditions. Thirty females of the 3/4 Holstein x ¼ Zebu breed were used, half for each group during a year were, the control group and the group treated with diflubenzuron 3%, which was provided with the salt in the trough, available to all animals throughout the day. The animals were managed every 14 days for tick count, weight verification and to observe their well-being. Animals having above 100 engorged ticks were treated by spraying (DDVP-Diclorvós, 60 grams, Clorpirifós, 20 grams, and solution, 20 grams). Based on tick biology and histology the Diflubenzuron 3% did not affect the development of ticks that survived the parasitic phase. The effect is in the tick larvae only and the efficacy is about 54, 6% of protection using Diflubenzuron 3% in the salt. The use of acaricides when associated to diflubenzuron 3% reduce in 71% the use these acaricides and the cost of acaricide in aspersion represent when compared with diflubenzuron 3% only 7,9 %. The use of diflubenzuron 3% associated with chemical control is an effective proposal to cattle tick control with low contamination that should be thought by the production chain their cost/benefit taking into account the economic and environmental issues.

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Section: Introductionmentioning

confidence: 99%

Diflubenzuron Effectiveness in Cattle Tick(Rhipicephalus Boophilus microplus) Control in Field Conditions

Andreotti

Garcia²,

Matias³

et al. 2015

Pharm Anal Acta

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“…O DFB é um composto regulador do crescimento de insetos que inibe a síntese de quitina durante o desenvolvimento dos estágios imaturos e, consequentemente, interrompe o ciclo larval e reduz a emergência de adultos. Pertence a um grupo de inseticidas de nova geração denominados reguladores de crescimento ou IGR (insect growth regulator), com ação mais específica para insetos (1,17). Estes compostos são utilizados desde a década de 1970 para controlar populações de insetos que constituem praga da agricultura (16) e vários estudos relatam a suscetibilidade e os efeitos inseticidas sobre vetores de importância para a saúde pública, como Aedes e Culex (4,10,12,20,27).…”

Section: Introductionunclassified

MECANISMOS DA AÇÃO LARVICIDA DO DIFLUBENZURON SOBRE Aedes aegypti EVIDENCIADOS PELAS ALTERAÇÕES ULTRAESTRUTURAIS

Borges¹,

Arruda²,

Oliveira³

et al. 2012

Rev Patol Trop

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Mechanisms of the larvicidal effect of diflubenzuron on Aedes aegypti larvae, as evidenced by ultrastructural changesDengue is a viral disease transmitted by Aedes aegypti in over 100 countries in the intertropical band in the world and the main forms of control are antivectorial actions. In this paper, ultrastructural changes caused by diflubenzuron (DFB) are presented. The experiments were performed with 3 rd instar larvae of Ae. aegypti with DFB at concentrations of 0.1 and 1 µg/mL. After 24h of exposure, larvae were collected, fixed, dehydrated, embedded, cut, contrasted with uranyl acetate and 3% lead citrate and examined under the electron microscope. Ultrastructural alterations caused by the diflubenzuron inhibitory activity were observed in the cuticle and in the midgut of Ae. aegypti larvae treated with 0.1 and 1 µg/mL, for 24 hours. The alterations observed by scanning microscopy included higher number of bristles, which were thinner and longer than the controls and exhibited a coiling pattern in the intersegmental grooves. Transmission electron microscopy analysis revealed that the epicuticle almost came entirely off the new epicuticle and had no points of reinforcements commonly found in the control. The midgut cells of the larvae treated with diflubenzuron presented a spongy skeleton and in the ultrathin sections, the cells showed intense vacuolation and damage, however with secretion vesicles present and mitochondria preserved. These studies indicate that the diflubenzuron can also act in the midgut cells, being a promising product for use in Ae. aegypti control. This study showed that the DFB interferes with the process of ecdysis, prevents the release of the old cuticle that accumulates in the intersegmental spaces and strangle the segmental portions in a successive and cumulative process, blocked the changes, causing the death of the larva. It also acts destroying the midgut cells.

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“…The insect growth regulators (IGR) are a class of products that cause physiologic and morphologic changes during the insect development (Chamberlain 1975, Graf 1993, Lyra et al 1998. Contrary to conventional insecticides, they present a more restricted action spectrum and do not affect the neural system of the insects (Winslow 1992, Graf 1993.…”

mentioning

confidence: 99%

Effect of diflubenzuron on immature stages of Haematobia irritans (L.) (Diptera: Muscidae) in Uberlândia, State of Minas Gerais, Brazil

Silva

Mendes

2002

Mem. Inst. Oswaldo Cruz

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Acción de inhibidores de la síntesis de la quitina en la reproducción de Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae)

Cited by 7 publications

References 8 publications

Diflubenzuron Effectiveness in Cattle Tick(Rhipicephalus Boophilus microplus) Control in Field Conditions

Diflubenzuron Effectiveness in Cattle Tick(Rhipicephalus Boophilus microplus) Control in Field Conditions

MECANISMOS DA AÇÃO LARVICIDA DO DIFLUBENZURON SOBRE Aedes aegypti EVIDENCIADOS PELAS ALTERAÇÕES ULTRAESTRUTURAIS

Effect of diflubenzuron on immature stages of Haematobia irritans (L.) (Diptera: Muscidae) in Uberlândia, State of Minas Gerais, Brazil

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