EFFECTS OF ANTENNECTOMY AND A JUVENILE HORMONE ANALOG ON PHEROMONE PRODUCTION IN THE BOLL WEEVIL (COLEOPTERA: CURCULIONIDAE)

1988 ◽  
Vol 23 (1) ◽  
pp. 52-58 ◽  
Author(s):  
J. C. Dickens ◽  
W. L. McGovern ◽  
G. Wiygul
Keyword(s):  
Juvenile Hormone ◽  
Aggregation Pheromone ◽  
Topical Application ◽  
Olfactory Receptors ◽  
Boll Weevil ◽  
Anthonomus Grandis ◽  
Pheromone Production ◽  
Juvenile Hormone Analog ◽  
Hormone Analog

Aggregation pheromone production by male boll weevils, Anthonomus grandis grandis Boheman can be stimulated by both antennectomy and topical application of a juvenile hormone analog (JHA, methoprene). Since JHA decreases sensitivity of antennal olfactory receptors, its effects on pheromone production may possibly be by either stimulating release of some blood-borne factor or decreasing antennal input.

Effect of juvenile hormone analog, fenoxycarb, on pheromone production byIps paraconfusus (Coleoptera: Scolytidae)

1988 ◽  
Vol 14 (4) ◽  
pp. 1087-1098 ◽  
Author(s):  
N. -M. Chen ◽  
J. H. Borden ◽  
H. D. Pierce
Keyword(s):  
Juvenile Hormone ◽  
Pheromone Production ◽  
Juvenile Hormone Analog ◽  
Hormone Analog

scholarly journals Correction to: Sublethal effects of a juvenile hormone analog, Pyriproxyfen demographic parameters of non-target predator, Hippodamia convergens Guerin-Meneville (Coleoptera: Coccinellidae)

Ecotoxicology ◽  
2020 ◽  
Vol 29 (7) ◽  
pp. 1029-1031
Author(s):  
Ayesha Iftikhar ◽  
Faisal Hafeez ◽  
Muhammad Hafeez ◽  
Muhammad Farooq ◽  
Muhammad Asif Aziz ◽  
...  
Keyword(s):  
Juvenile Hormone ◽  
Sublethal Effects ◽  
Demographic Parameters ◽  
Hippodamia Convergens ◽  
Juvenile Hormone Analog ◽  
Hormone Analog

No Detectable Trade-Offs Among Immune Function, Fecundity, and Survival via a Juvenile Hormone Analog in the House Cricket

2014 ◽  
Vol 43 (4) ◽  
pp. 357-361 ◽  
Author(s):  
A Nava-Sánchez ◽  
R Munguía-Steyer ◽  
A Córdoba-Aguilar
Keyword(s):  
Juvenile Hormone ◽  
Immune Function ◽  
House Cricket ◽  
Juvenile Hormone Analog ◽  
Trade Offs ◽  
Hormone Analog

EFFECTS OF ECDYSONES, JUVENILE HORMONE ANALOGS, AND 6-OXOOCTANOIC ACID ON THE DEVELOPMENT OF THE MOSQUITO, CULEX TARSALIS (DIPTERA: CULICIDAE)

1974 ◽  
Vol 106 (1) ◽  
pp. 79-85 ◽  
Author(s):  
P. I. Ittycheriah ◽  
M. S. Quraishi ◽  
E. P. Marks
Keyword(s):  
Juvenile Hormone ◽  
Topical Treatment ◽  
Adult Emergence ◽  
Fourth Instar ◽  
Culex Tarsalis ◽  
Juvenile Hormone Analog ◽  
Hormone Analog ◽  
High Doses ◽  
Hormone Analogs ◽  
Very High

AbstractEggs, larvae, and pupae of Culex tarsalis Coquillett were treated with ecdysones, juvenile hormone analogs, and 6-oxooctanoic acid. Effects of these agents on mortality, induction of supernumerary stages, and adult emergence were determined. Topical treatment of eggs with CRD9499 (a juvenile hormone analog), β-ecdysone, and 22-isoecdysone caused a reduction in adult emergence. Treatment of fourth-instar larvae with these chemicals not only induced mortality but also caused the formation of supernumerary intermediate stages. Larvae of C. tarsalis were very susceptible to CRD9499, but pupae were resistant. The ecdysones caused some mortality but only at very high doses and would thus be of little use as larvicides. 6-Oxooctanoic acid caused high rates of mortality at 0.001 M concentrations.

scholarly journals Regulation of metamorphosis in neopteran insects is conserved in the paleopteran Cloeon dipterum (Ephemeroptera)

2021 ◽  
Vol 118 (34) ◽  
pp. e2105272118 ◽  
Author(s):  
Orathai Kamsoi ◽  
Alba Ventos-Alfonso ◽  
Fernando Casares ◽  
Isabel Almudi ◽  
Xavier Belles
Keyword(s):  
Juvenile Hormone ◽  
Molecular Analysis ◽  
Nymphal Instar ◽  
Morphological Studies ◽  
Flying Insects ◽  
Juvenile Hormone Analog ◽  
Hormone Analog ◽  
Two Stages ◽  
Cloeon Dipterum ◽  
Hormonal Treatments

In the Paleozoic era, more than 400 Ma, a number of insect groups continued molting after forming functional wings. Today, however, flying insects stop molting after metamorphosis when they become fully winged. The only exception is the mayflies (Paleoptera, Ephemeroptera), which molt in the subimago, a flying stage between the nymph and the adult. However, the identity and homology of the subimago still is underexplored. Debate remains regarding whether this stage represents a modified nymph, an adult, or a pupa like that of butterflies. Another relevant question is why mayflies have the subimago stage despite the risk of molting fragile membranous wings. These questions have intrigued numerous authors, but nonetheless, clear answers have not yet been found. By combining morphological studies, hormonal treatments, and molecular analysis in the mayfly Cloeon dipterum, we found answers to these old questions. We observed that treatment with a juvenile hormone analog in the last nymphal instar stimulated the expression of the Kr-h1 gene and reduced that of E93, which suppress and trigger metamorphosis, respectively. The regulation of metamorphosis thus follows the MEKRE93 pathway, as in neopteran insects. Moreover, the treatment prevented the formation of the subimago. These findings suggest that the subimago must be considered an instar of the adult mayfly. We also observed that the forelegs dramatically grow between the last nymphal instar, the subimago, and the adult. This necessary growth spread over the last two stages could explain, at least in part, the adaptive sense of the subimago.

scholarly journals The Identification of Boll Weevil, Anthonomus grandis grandis (Coleoptera: Curculionidae), Genes Involved in Pheromone Production and Pheromone Biosynthesis

Insects ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 893
Author(s):  
Lindsey C. Perkin ◽  
Jose L. Perez ◽  
Charles P.-C. Suh
Keyword(s):  
Control Strategies ◽  
Boll Weevil ◽  
Pheromone Biosynthesis ◽  
Anthonomus Grandis ◽  
Pheromone Production ◽  
Rna Seq ◽  
Level Control ◽  
Production Development ◽  
Gene Level ◽  
One Step

Eradication programs for the boll weevil, Anthonomus grandis grandis Boheman (Coleoptera: Curculionidae), rely almost exclusively on pheromone traps to indicate the need for insecticide applications. However, the effectiveness of traps in detecting weevil populations is reduced during certain times of the year, particularly when cotton is actively fruiting. Consequently, this could result in fields becoming heavily infested with weevils. It is widely speculated that the lack of weevil captures in traps during this period is largely due to the overwhelming amount of pheromone released by weevils in the field, which outcompete the pheromone released from traps. Thus, this work sought to identify genes involved in pheromone production so that new control methods that target these genes can be explored. We conducted an RNA-seq experiment that revealed 2479 differentially expressed genes between pheromone-producing and non-pheromone-producing boll weevils. Of those genes, 1234 were up-regulated, and 1515 were down-regulated, and most had gene annotations associated with pheromone production, development, or immunity. This work advances our understanding of boll weevil pheromone production and brings us one step closer to developing gene-level control strategies for this cotton pest.

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