Modification de la fertilité du carpocapse Cydia pomonella à la suite du contact des adultes avec un régulateur ou un inhibiteur de croissance d'insectes

Charmillot, P. J.; Pasquier, D.

doi:10.1111/j.1570-7458.1992.tb02423.x

Cited by 10 publications

(8 citation statements)

References 8 publications

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“…In contrast, fenoxycarb, a potent ovicide in C. pomonella (Charmillot et al, 1990), did not reduce the number of eggs laid (Charmillot and Pasquier, 1992; this study). Although the mechanisms of exogenous JH or fenoxycarb action on oocytes in C. pomonella have not been elucidated, application of fenoxycarb did not alter the titre of circulating JH sampled 24 h later.…”

Section: Discussioncontrasting

confidence: 67%

Juvenile hormone catabolism and oviposition in the codling moth, Cydia pomonella, as functions of age, mating status, and hormone treatment

Cole

Ramaswamy

Srinivasan

et al. 2001

Arch Insect Biochem Physiol

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In vitro catabolism of juvenile hormone (JH) in haemolymph of adult female Cydia pomonella was ascribed mainly to juvenile hormone esterase (JHE) activity. No significant differences were noted between virgin and mated females 0-96 h post-emergence. Changes in JHE activity did not appear dependent upon fluctuations in JH titre; conversely, changes in JHE activity could not explain the changes in JH titres. Maximal JHE activity was recorded at 24 h (331.47 +/- 47.25 pmol/h/microl; 355.93 +/- 36.68 pmol/h/microl, virgin; mated insects, respectively) and preceded the peak in JH titres at 48 h. Topical application of JH II (10 ng-10 microg) or fenoxycarb (50 ng) enhanced JHE activity up to 640 and 56%, respectively. Treatment upon emergence with 10 microg JH II induced enzymic activity for less than 24 h, and when 10 microg JH II or 50 ng fenoxycarb were applied, circulating JH titres returned to control levels within 24 h. Oviposition was highly sensitive to exogenous JH and declined significantly with dosages >100 pg. To allow a degree of oocyte maturation before JH treatment, the hormone was administered at 6, 12, 24, or 48 h post-emergence and/or females were mated. Neither measure "protected" the system; oviposition declined immediately after JH application.

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Section: Discussioncontrasting

confidence: 67%

Juvenile hormone catabolism and oviposition in the codling moth, Cydia pomonella, as functions of age, mating status, and hormone treatment

Cole

Ramaswamy

Srinivasan

et al. 2001

Arch Insect Biochem Physiol

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“…Nevertheless, the present results do imply a po tential use of pesticides based on juvenoid action for the control of the apple blossom weevils. Juvenoid basedpesticides, such as fenoxycarb (Charmillot & Pasquier, 1992) or W-328 and related preparations (Kuldovâ & Matolin, pers. commun.)…”

Section: Discussionmentioning

confidence: 99%

Activation of gonads and disruption of imaginal diapause in the apple blossom weevil, Anthonomus pomorum (Coleoptera: Curculionidae), with juvenoids in laboratory and field trials

Žďárek¹,

Čtvrtečka²,

Hovorka³

et al. 2000

Eur. J. Entomol.

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Abstract.A possibility of using synthetic analogues of juvenile hormone (juvenoids) to disrupt imaginal diapause of the apple blos som weevil, Anthonomus pomorum females was demonstrated. Out of three preparations tested (methoprene, fenoxycarb and W-328) methoprene and fenoxycarb appeared to be effective. Sensitivity to juvenile hormone analogues develops early after imagi nal emergence (even before the female starts to feed) and lasts throughout the whole acstivo-hibernation dormancy. Although the ju venoids could stimulate the onset of oogenesis at any time during diapause, the propensity of the ovaries to form normal eggs developed only during hibernation part of the dormancy; in earlier stages of diapause accumulation of yolk was observed but ma tured eggs were not produced. Methoprene treatment caused marked increase of locomotory activity accompanied with decrease of dry weight, increase of water content, depletion of trehalose resources, decrease of cold hardiness and, finally, 100% mortality within four weeks in the weevils treated during their feeding or aestivation stages. Although similar changes were observed in the treated pre-feeding weevils, they later recovered and survived until next spring without apparent loss of cold hardiness. A possibility of designing a control method based on this principle is discussed and the results of small-scale field trials that support its plausibil ity are reported.

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“…As benzoylureas are important compounds in integrated pest management programmes (Flexner et al, 1986), it was necessary to establish whether one of them could still be used without increasing the resistance magnitude. Tests were performed on both neonate larvae and eggs, since benzoyureas are mainly used on C. pomonella at the egg stage (Charmillot & Pasquier, 1992). The efficiency of these compounds against resistant strains was compared with that of the juvenile hormone analogue fenoxycarb, which is also registered as an ovicide against this species.…”

Section: Introductionmentioning

confidence: 99%

Differential ovicidal and larvicidal resistance to benzoylureas in the codling moth, Cydia pomonella

Sauphanor

Brosse

Monier

et al. 1998

Entomologia Exp Applicata

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French populations of the codling moth Cydia pomonella (L.) (Lepidoptera, Tortricidae), a major pest in apple and pear orchards, have developed resistance to different classes of insecticides including the benzoylurea diflubenzuron, a chitin synthesis inhibitor. Ovicidal tests performed on two susceptible strains and one strain selected for its resistance to diflubenzuron revealed the same order of magnitude in resistance ratios to this compound (30‐fold) and two other benzoylureas teflubenzuron and flufenoxuron (22‐ and 11‐fold, respectively). Field rates of these three compounds induced a 45–55% decrease in hatching in the resistant strain, compared to over 90% in the susceptible insects. Despite a 52‐fold ovicidal resistance ratio to the juvenile hormone analog fenoxycarb, this compound induced a 85% decrease in hatching in the resistant strain. Conversely the newly hatched larvae of the resistant strain exhibited a 45 000‐, 33‐ and 2.1‐fold resistance ratio to diflubenzuron, teflubenzuron and flufenoxuron, respectively. The latter value was not significant, and the field rate of flufenoxuron killed over 97% of the resistant larvae while diflubenzuron had no effect. This lack of relationship between ovicidal and larvicidal resistance may be due to different transport properties together with differential enzymatic metabolization. Our results may limit the validity of substitution instars, which approach is frequently used for resistance monitoring. More importantly for resistance management, the resistance of different target instars to each compound has to be considered when establishing control strategies.

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Modification de la fertilité du carpocapse Cydia pomonella à la suite du contact des adultes avec un régulateur ou un inhibiteur de croissance d'insectes

Cited by 10 publications

References 8 publications

Juvenile hormone catabolism and oviposition in the codling moth, Cydia pomonella, as functions of age, mating status, and hormone treatment

Juvenile hormone catabolism and oviposition in the codling moth, Cydia pomonella, as functions of age, mating status, and hormone treatment

Activation of gonads and disruption of imaginal diapause in the apple blossom weevil, Anthonomus pomorum (Coleoptera: Curculionidae), with juvenoids in laboratory and field trials

Differential ovicidal and larvicidal resistance to benzoylureas in the codling moth, Cydia pomonella

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