Juvenile Hormone.....in Retrospect and in Prospect

Williams, Carroll M.

doi:10.1007/978-1-4684-7947-8_1

Cited by 26 publications

(20 citation statements)

References 30 publications

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“…substrate precursors of JH, other specific hormones and neurosecretions (WILLIAMS, 1976). In the haemolymph of 18 day adult females of Locusta only JH-III was detected definitively, which is in agreement with the in viva findings in reproducing adults of Schistocerca gregaria (TRAUTMANN et al, 1974;BLIGHT and WENHAM, 1976) and observations on in vitro incubation experiments with CA from Schistocerca vaga (JUDY et al, 1973).…”

Section: Discussionsupporting

confidence: 85%

Quantitative determination of the juvenile hormones in the haemolymph of Locusta migratoria during normal development and after implantation of corpora allata

Huibregtse-Minderhoud

Hondel-Franken

Hoof

et al. 1980

Journal of Insect Physiology

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Abstract-Simultaneous quantitative determination of the three naturally occurring juvenile hormones in insects (JH-I, JH-II and JH-III) was performed on haemolymph samples of both normally developing locusts and iocusts implanted with active corpora allata, using capillary gas chromatography with electron capture detection.In fourth instar female larvae, 24-48 hr after the third ecdysis, as well as in adult females, 18 days after the imaginal ecdysis, only JH-III was detected. In fifth instar female larvae JH-III was present in very low concentrations, if at all.After implantation of four pairs ofcorpora allata taken from young fourth instar fernaL larvae or one pair or corpora allata taken from adult females into fifth instar female larvae O-24 hr after eedysis. an elevation of the JH-III titre was observed. Neither JH-I nor JH-II coufd be detected. The amount of JH-III, already elevated 2 hr after implantation, remained high for several days in comparison to that of control insects. On the third day after the subsequent moult the JH-III level was comparable to that of normally developing fifth instar larvae. Factors involved in the achievement of the haemolymph JH-titre are discussed.

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Section: Discussionsupporting

confidence: 85%

Quantitative determination of the juvenile hormones in the haemolymph of Locusta migratoria during normal development and after implantation of corpora allata

Huibregtse-Minderhoud

Hondel-Franken

Hoof

et al. 1980

Journal of Insect Physiology

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“…This hypothesis was confirmed in experiments in which CA are explanted from larvae previously challenged with hydroprene in vivo. These CA turned out to be completely inhibited, most likely by a neurohormone such as allatohibin, a factor first proposed by Williams in 1976. In summary, none of the AJH prototypes described here has been deemed to be sufficiently active for practical purposes, but the diversity of structures and the diversity of mechanisms of action found so far maintains hopes for further discoveries in this area.…”

Section: Piperonyl Butoxide (Pb) --This Compoundmentioning

confidence: 71%

Insect Control With Growth Regulators Interfering With the Endocrine System

Staal

1982

Entomologia Exp Applicata

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Out of a field of many thousands of amdogs of the insect juvenile hormones (JHA). only a few have found practical utility in the control of a variety of insect species. Their mode of action and the lack of foliar stability in all but the must rcccntlv discovered juvcnoids have st) far precluded their use against pests of field crops. A possible more efficacious mode of action is present in anti-juvenile hormone agents (AJH). which can induce premature metamorphosis, but of which none of the present prototypes has yet been. developed into a cost cflective control agent. These AJH prototypes represent a number of vcrv different action mechanisms and degrees of selectivity lk)r different insect taxa. In an even more contemporary approach, the interference with ncurohormonal pathways presents significant perspectives for insect control.

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“…I will examine first an outline of the current model of lepidopteran metamorphosis although much more extensive reviews on this subject are available (Gilbert et al, 1980 ;Riddiford, 1980 ;Williams, 1976).…”

Section: Current Model For Lepidopteran Metamorphosismentioning

confidence: 99%

Use of parasite regulation of host endocrinology to enhance the potential of biological control

Jones

1986

Entomophaga

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The implications of parasite regulation of host endocrinology for successful biological control have not been fully appreciated. Insect parasites regulate host metamorphosis in a number of different ways. For a given host (pest) situation, each form of host regulation has its own advantages and disadvantages. Careful selection of a parasite based upon its mode of host regulation can enhance the potential for biological control success. A basic knowledge of the endocrine basis for parasite regulation of its host will enable prediction of whether a parasite can regulate, and survive in, a host to which it has not been previously exposed.KEY-WORDS : Parasite regulation, host endocrinology, biological control.Insect parasites play a central role in the theory and practice of biological control of insect pests. Important behavioral and physiological properties of the parasite are conceptualized as I) host habitat finding, 2) host finding, 3) host acceptance, and 4) host suitability. Vinson (1975) distinguished between the suitability of the host as a template for parasite growth and the ability of the parasite to regulate the physiology of the host to keep that template suitable.The importance of the physiological aspects of the host-parasite interaction has been perceived only by some biological control authorities. DeBach (1974) stated that biological control problems must be solved by basic research including physiological studies. Achieving an understanding of the steps leading to selection and utilization of a specific host "... is one of the most important problems involved in the scientific investigation of biological control" (Doutt, 19641. Furthermore, "It appears very likely that if all facts were known, physiological unsuitability of natural-enemy species to their hosts has been the cause of a great many of the failures in colonization of imported species" (DeBaeh & Bartlett, 1964).Unfortunately, little research emphasis has been given to the physiological basis for host regulation, or how such knowledge can aid in successful biological control. Research papers, review articles and research grants rarely give real or hypothetical examples of how this basic knowledge can give more benefits than empirical observations.Possibly such examples were not given in the past because the endocrine basis for insect development and metamorphosis is only recently becoming understood, and these advances often are published in journals not scrutinized by biological control researchers. The purpose of this review is to 1 ) outline ways in which hosts and parasites do or can interact endocrinologically, 2) enumerate for biological control researchers advances in basic physiology which

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Juvenile Hormone.....in Retrospect and in Prospect

Cited by 26 publications

References 30 publications

Quantitative determination of the juvenile hormones in the haemolymph of Locusta migratoria during normal development and after implantation of corpora allata

Quantitative determination of the juvenile hormones in the haemolymph of Locusta migratoria during normal development and after implantation of corpora allata

Insect Control With Growth Regulators Interfering With the Endocrine System

Use of parasite regulation of host endocrinology to enhance the potential of biological control

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