Diflubenzuron and oogenesis in the codling moth, <i>Cydia pomonella</i> (L.)

Alsystin, a benzoylphenylurea derivative, was evaluated on Culex pipiens pipiens L. Treatment was made on newly third‐ and fourth‐instar larvae for 24 h. Mortality occurred at various developmental stages following treatment. However, death as larvae was relatively important compared with the mortality recorded for the other later developmental stages. Treatment resulted in a dose‐dependent reduction in adult emergence. Moreover, treatment caused morphological aberrations depending upon the importance of larval–adult transformation and significantly increased the duration of both third and fourth larval instars. A histological study conducted on fourth instar larval integument, revealed that Alsystin delayed the ecdysis and significantly reduced the thickness of both larval and pupal cuticles secreted compared with controls. Moreover, the apolysis that occurred at day 4 in controls was not affected by treatment.

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“…1974 ; Soltani et al . 1984a ; Mohsen & Mehdi 1989; Soltani & Soltani‐Mazouni 1992; Soltani et al . 1996 ).…”

Section: Discussionunclassified

“…Moreover, treatment resulted also in an increase of the duration of development of the larval instars tested, confirming the effects induced by this class of insecticides ( Soltani et al . 1989 ; Soltani & Soltani‐Mazouni 1992; Soltani et al . 1996 ).…”

Section: Discussionmentioning

confidence: 99%

Laboratory evaluation of Alsystin, a chitin synthesis inhibitor, against Culex pipiens pipiens L. (Dip., Culicidae): effects on development and cuticle secretion

Rehimi

Soltani

1999

J Applied Entomology

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“…Ecdysteroid titre was observed in 7 day-old pupae to 4 day-old adult female ovaries. Soltani and Mazouni (1997) reported ecdysone levels that when ovaries from 4 day-old females of mealworm, i.e. at the end of vitellogenesis were cultured in media supplemented with diflubezuron, preliminary data indicated that ovarian amounts of ecdysteroids, as measured in vivo, changed during vitellogenesis of the T. molitor in a characteristic way.…”

Section: Effects On Ecdysteroid Titres Of Ovaries and Testesmentioning

confidence: 97%

Biochemical Analyses of Action of Chlorfluazuron as Reproductive Inhibitor in Spodoptera litura

Perveen¹

2012

Insecticides - Advances in Integrated Pest Management

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“…Thereafter, this procedure was routinely applied for evaluation of DFB residues in different organs and tissues from several insect pests [23][24][25], and also to study DFB degradation in seawater [26]. These toxicity and degradation studies were limited almost exclusively to acute exposure of DFB.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Diflubenzuron: Degradation in Freshwater and Bioconcentration in Mosquitofish Following Chronic Exposure

Zaidi¹,

Farine²,

Soltani³

2013

JEP

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Diflubenzuron (DFB, trade name dimilin ® 25 WP) is a chitin synthesis inhibitor widely used against forest insect pests in Algeria. Prior to implementation of these products as chemical agents for mosquito control, knowledge on their potential effects on non-target organisms and its behaviour in water are needed. Therefore, the present study was focused on DFB and aimed to use an HPLC procedure developed previously in order to obtain information on its degradation in freshwater and its bioconcentration in adult females of the fish Gambusia affinis (Cyprinodondiformes, Poeciliidae), which is one of the best candidates for biological control programs against mosquitoes. The adult females were exposed to dimilin ® (initial concentration 312 ng a.i./ml) for 28 days and residues analysis determined at different exposure times (0, 7, 14, 21 and 28 days). The concentration of DFB in freshwater decreased with exposure time while the amount of residues detected at the surface of the fish body increased progressively to reach a maximum at day 14 (162.7 ± 14.0 ng/fish) and declined thereafter during the exposure period. In addition, DFB incorporation into body increased with decreasing DFB concentration in water at each exposure time. The following average distribution was noted at the end of experiment (28 days): about 33% of the applied concentration was detected on the surface of fish body and was recovered by simple rinsing, and about 67% was found inside the fish body. A degradation in water and surface of fish occurred starting day 14 during the experimental period. Thus, about 40% of the initial concentration was degraded in freshwater after 28 days. The results are discussed to develop a better understanding of the degradation of dimilin in water and their potential effect on non-target organisms for its application for controlling mosquito.

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Diflubenzuron and oogenesis in the codling moth, Cydia pomonella (L.)

Cited by 45 publications

References 26 publications

Laboratory evaluation of Alsystin, a chitin synthesis inhibitor, against Culex pipiens pipiens L. (Dip., Culicidae): effects on development and cuticle secretion

Laboratory evaluation of Alsystin, a chitin synthesis inhibitor, against Culex pipiens pipiens L. (Dip., Culicidae): effects on development and cuticle secretion

Biochemical Analyses of Action of Chlorfluazuron as Reproductive Inhibitor in Spodoptera litura

Experimental Study on Diflubenzuron: Degradation in Freshwater and Bioconcentration in Mosquitofish Following Chronic Exposure

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