Inhibition of metamorphosis by juvenoids inNauphoeta cinerea (Olivier)

Radwan, Wafaa A.; Sehnal, F.

doi:10.1007/bf01921503

Cited by 8 publications

(1 citation statement)

References 6 publications

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“…Extrinsic juvenoids mimic the insect juvenile hormone (JH), which causes endocrine unbalance and gives rise to developmental disturbances. Cockroaches affected during ontogeny exhibit various disorders such as malfunction of sex glands, melanism, deformation of wings and external genitalia or suffer from difficulties during ecdysis (Hangartner &Masner, 1973;Das & Gupta, 1974, 1977Radwan & Sehnal, 1974;Nosec et al, 1977;Roberts, 1977;Kramer et al, 1989). JH-unbalance can also lead to behavioral abnormalities (Ramaswamy & Gupta, 1981).…”

Section: Introductionmentioning

confidence: 99%

Management of a German cockroach population with a juvenoid bait formulation: an experiment in residential buildings

Zeman¹,

Kyselova²,

Rupeš

et al. 1992

Entomologia Exp Applicata

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Baits including 0.1% of ethyl 2‐(4‐((1,4‐dioxaspiro [4.5]dec‐6‐yl) methyl) phenoxy) ethylcarbamate were applied in two buildings containing 46 apartments with various degrees of infestation of the German cockroach, Blattella germanica (L.). During a yearly experiment, generally 8 baits were placed in each apartment and replenished monthly at which time cockroach population density, demographic structure, and percentage of morphologically deformed adults were determined from specimens captured by sticky‐trap sampling. Initial growth of the cockroach population observed during the first two months after deposition of the baits was followed by an asymptotical decrease. Only 2.5% of the initial population remained at the end of the experiment. Although adults with twisted wings (sterile) constituted only 70% of the total adult catches, the decrease of the nymph/adult ratio from 2.9 to 0.7 indicated a far more profound inhibitory effect on cockroach reproduction. This study shows that baits might be an efficient alternative to juvenoid formulations currently in use for control of the German cockroach.

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Section: Introductionmentioning

confidence: 99%

Management of a German cockroach population with a juvenoid bait formulation: an experiment in residential buildings

Zeman¹,

Kyselova²,

Rupeš

et al. 1992

Entomologia Exp Applicata

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The nature and development of sex attractant specificity in cockroaches of the genus Periplaneta. II. Juvenile hormone regulates sexual dimorphism in the distribution of antennal olfactory receptors

Schafer¹,

Sanchez²

1976

J. Exp. Zool.

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Sexual dimorphism of antennal sense organs appears only at the adult stage during normal development of the cockroach, Periplaneta arnericana. Adult males acquire approximately twice as many olfactory sensilla as females at the terminal ecdysis. When terminal instar larvae are subjected to unilateral antennectomy, most ecdyse to supernumerary larvae rather than adults. Sexual dimorphism is not evident in the intact (unamputated) antenna during the extra larval stage, but appears at the following ecdysis which leads to the adult stage. Allatectomy of male and female larvae in the penultimate instar produces adultoids which show antennal sexual dimorphism. Whole-body treatment of terminal instar larvae with exogenous juvenile hormone-mimic (JH-M) results in supernumerary larvae which lack antennal sexual dimorphism. When these superlarvae are removed from the influence of JH-M, they ecdyse to adults with antennal sexual dimorphism. Topical application of JH-M to male antennae early in the terminal larval instar results in the emergence of adults which lack the total male complement of antennal sensilla, but are otherwise normal-appearing. These results indicate that an inhibitory action of juvenile hormone prevents the appearance of antennal sexual dimorphism during normal larval development.The postembryonic development of antennal olfactory receptors in cockroaches is regulated, in part, by the juvenile hormone (JH) (Schafer and Sanchez, '74). In the African woodroach, Leucophaea maderue, the density of antennal olfactory sensilla remains constant at about 400 sensilla per mm2 during each stage of larval development, because olfactory sensilla are added at each ecdysis in direct proportion to the increase in antennal surface area. However, at the terminal ecdysis leading to the adult stage, the density of olfactory receptor organs increases to 620 sensilla per mm2 in both males and females. Exogenously applied juvenile hormonemimic (JH-M) prevents this increase; or, the increase can be induced precociously by removing the corpora allata, endocrine organs which produce juvenile hormone in larval insects (Schafer and Sanchez, '74).J. EXP. UXIL., 198: 323-336.We chose to perform similar experiments on the American cockroach, Periplaneta americana, since the antennae show distinct sexual dimorphism related to the pheromone-dependent sexual behavior of males of this species. For example, the initial step in courtship behavior of P. americam is the male's reception of a femaleproduced sex attractant (Roth and Willis, '52; Barth, '70; Simon, '71). Of particular interest was the possibility that the differentiation of sex attractant receptors is inhibited by juvenile hormone during larval development. There are approximately twice as many olfactory sensilla on adult male P. americana antennae as on adult female antennae (Schafer and Sanchez, '73). In contrast, no sexual dimorphism is seen in the antennae of Leucophaea at any

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Action of Juvenoids on Different Groups of Insects

Sehnal

1976

The Juvenile Hormones

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Inhibition of metamorphosis by juvenoids inNauphoeta cinerea (Olivier)

Cited by 8 publications

References 6 publications

Management of a German cockroach population with a juvenoid bait formulation: an experiment in residential buildings

Management of a German cockroach population with a juvenoid bait formulation: an experiment in residential buildings

The nature and development of sex attractant specificity in cockroaches of the genus Periplaneta. II. Juvenile hormone regulates sexual dimorphism in the distribution of antennal olfactory receptors

Action of Juvenoids on Different Groups of Insects

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