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  • Pentatomidae  (3)
  • Springer  (3)
  • eLife Sciences Publications
  • 1
    ISSN: 1573-1561
    Keywords: Aggregation pheromone ; B. bibax ; Citrus ; Hemiptera ; Pentatomidae ; dorsal abdominal gland ; hemiacetal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The attraction of female spined citrus bugs,Biprorulus bibax, to natural and synthetic aggregation pheromone was studied using an olfactometer and a large flight cage. No locomotory response by postdiapause, prereproductive females to heptane extracts of male dorsal abdominal glands (DAGs) (site of pheromone production) was recorded in the olfactometer study. However, postdiapause, prereproductive females showed significant attraction to sites baited with DAG extracts in the flight cage (1.9–3.0 times that of unbaited sites). Prereproductive and reproductive females showed greatest attraction to sites baited with a synthetic blend of pheromone [(3R,4S,1′E-3,4-bis(1′-butenyl)tetrahydro-2-furanol, linalool, farnesol, nerolidol] (2.3–4.7 times the attraction of unbaited sites). Females also responded significantly to sites baited with the hemiacetal major component alone (1.7–2.2×). Diapausing females collected from fall populations did not respond to natural or synthetic pheromone baits. Potential applications of the synthetic aggregation pheromone are discussed with respect toB. bibax management.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-1561
    Keywords: Nezara viridula ; Heteroptera ; Pentatomidae ; sex pheromone ; trans- andcis-(Z)-α-bisabolene epoxides ; interindividual variation ; bioassay ; pheromonal specificity ; isomer ; enantiomer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Thetrans- andcis-(Z)-α-bisabolene epoxides (trans- andcis-(Z)-αBE) are the main components of the male sex pheromone inNezara viridula. The role of thecis isomer and the importance of thecis/trans proportion for the activity and the specificity of the pheromone are not clearly elucidated and were studied here. Interindividual variation of thecis/trans proportion produced by males was studied by individual hexanic extracts in two strains originating from the south of France (SF) and French West Indies (FWI). Thetrans isomer composed 42–82% of bisabolene epoxides in SF males and 74–94% of bisabolene epoxides in FWI males. Means (± SD) significantly differ between SF (62.8%±8.4) and FWI (82.4%±5.9) males in spite of this interindividual variation. Different isomers of bisabolene epoxide were synthesized and their EAG activity on female antennae was compared. Racemictrans- andcis-(Z)-αBE elicited low EAGs, not different from the nonnaturaltrans andcis (E)-αBE that were inactive on behavior. Behavioral tests revealed that racemictrans- andcis-(Z)-αBE attracted 45% (P〈0.05) and 25% (P〈0.05) of females, respectively. The same levels of attraction were obtained with (−) enantiomers oftrans- andcis-(Z)-αBE, which attracted 40% (P〈0.05) and 20% (P〉0.05) of the females, respectively. Binary blends containing 75/25, 50/50, and 25/75 proportions ofcis/trans isomers were more attractive thantrans-(Z)-αBE alone and response of females to the 25%cis/75%trans blend was significantly more important than the response totrans-isomer alone (P〈0.05). The importance of thecis/trans proportion in relation with the specificity of the male pheromone is discussed.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-1561
    Keywords: Biprorulus bibax ; Hemiptera ; Pentatomidae ; aggregation pheromone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Female spined citrus bugs,Biprorulus bibax, in outdoor flight cage tests did not discriminate between synthetic aggregation pheromone blends containing either the racemate, natural (3R, 4S)-(−) or unnatural (4S, 3S)-(+) enantiomers of the major hemiacetal component (3R, 4S, 1′E)-3,4-bis(1′-butenyl)tetrahydro-2-furanol. Two to three times as many bugs were attracted to pheromone-baited sites compared to unbaited sites. The racemate of the hemiacetal is easier and less costly to synthesize than the enantiomers and will be used in development of the pheromone as a management tool for this pest.
    Type of Medium: Electronic Resource
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