Sex pheromone of blackheaded fireworm,Rhopobota naevana (Lepidoptera: Tortricidae), a pest of cranberry

Slessor, K. N.; Raine, J.; King, Gregory G.; Clements, S. J.; Allan, Sandra A.

doi:10.1007/bf01020546

Cited by 5 publications

(1 citation statement)

References 4 publications

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“…Blackheaded fireworm moths are able to mate within a day or two after emergence. Females release pheromone (McDonough et al, 1987;Slessor et al, 1987) to attract males. Most matings can be prevented by pheromonemediated mating disruption (Fitzpatrick et al, 1995(Fitzpatrick et al, , 2004Fadamiro et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Delayed mating reduces fecundity of blackheaded fireworm, Rhopobota naevana, on cranberry

Fitzpatrick¹

2006

Entomologia Exp Applicata

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This study examines the effects of delayed mating on two successive generations of blackheaded fireworm, Rhopobota naevana Hübner (Lepidoptera: Tortricidae), a pest of cranberry, Vaccinium macrocarpon Aiton (Ericaceae). The first (spring) generation produces eggs that hatch soon after oviposition, whereas the second (summer) generation produces mostly diapause eggs. Unmated female and male moths were placed together on the first, second, fourth, sixth, or eighth day after emergence. In the first generation, incidence of mating was greatest in the 1‐, 2‐, and 4‐day treatments then declined as female survival decreased. In the second generation, incidence of mating was lowest in the 1‐day treatment and greatest in the 2‐, 4‐, and 6‐day treatments. Most second generation females in the 6‐ and 8‐day treatments survived to mate. The mean oviposition period was 2.6 days for first generation females and 4.1 days for second generation females. Fecundity of singly mated females in both generations declined as age at mating advanced, but the pattern of decline differed between generations. First generation females that were mated on the first or second day laid more eggs than those mated on the fourth, sixth, or eighth day, and the number of infertile eggs increased as age at mating advanced. Fecundity of second generation females declined more gradually and the number of infertile eggs was greatest for females mated on the first, sixth, or eighth day. A consequence of the marked decline in fecundity due to mating delays in the first generation was that mean fecundity of the entire group of first generation females was ca. 13% less than that of the group of second generation females. On cranberry farms, pheromone‐mediated mating disruption can prevent or delay mating of blackheaded fireworm. If the frequency of disrupted (prevented and delayed) matings is similar in the two generations, fewer eggs will be laid in the first generation than in the second.

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Section: Introductionmentioning

confidence: 99%

Delayed mating reduces fecundity of blackheaded fireworm, Rhopobota naevana, on cranberry

Fitzpatrick¹

2006

Entomologia Exp Applicata

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Blackheaded fireworm: Laboratory and field studies of its sex pheromone

McDonough

Davis

Voerman³

1987

J Chem Ecol

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Electroantennogram (EAG) responses of maleRhopobota naevana (Hübner), the blackheaded fireworm, to all of the monoene straightchain 12- and 14-carbon alcohols and acetates implicated (Z)-11-tetradecenl-1-ol (Z11-14∶OH) and its acetate (Z11-14∶Ac) as sex pheromone components.Z11-14∶Ac produced the strongest EAG response of all compounds tested. Gas chromatography-mass spectrometry (GC-MS) analysis of extract of female sex pheromone glands (SPG) confirmed the presence ofZ11-14∶OH (125 pg/female) andZ11-14∶Ac (600 pg/female) (all other monoenes had different retention times). In field tests, traps baited withZ11-14∶OH alone captured males, but traps baited withZ11-14∶Ac alone did not. Traps baited with a combination ofZ11-14∶OH andZ11-14∶Ac in various ratios did not produce better trap catches thanZ11-14∶OH alone. (Z)-9-Dodecen-1-ol acetate (Z9-12∶Ac), reported by others to be a field attractant, did not produce trap catch in our tests, but in combination withZ11-14∶ OH (98∶2 in septa corresponding to 95:5 in vapor,Z11-14∶OH toZ9-12∶AC) produced a sevenfold increase in catch overZ11-14∶OH alone. IfZ9-12∶AC had been present in extract of SPG at 2-5% ofZ11-14∶OH, it would not have been detected in our GC-MS experiment.

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Optimizing the Point-Source Emission Rates and Geometries of Pheromone Mating Disruption Mega-Dispensers

2016

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High-emission-rate "mega-dispensers" have come into increasing use for sex pheromone mating disruption of moth pests over the past two decades. These commercially available dispensers successfully suppress mating and reduce crop damage when they are deployed at very low to moderate densities, ranging from 1 to 5/ha to 100-1000/ha, depending on the dispenser types and their corresponding pheromone emission rates. Whereas traditionally the emission rates for successful commercial mating disruption formulations have been measured in terms of amounts (usually milligram) emitted by the disruptant application per acre or hectare per day, we suggest that emission rates should be measured on a per-dispenser per-minute basis. In addition we suggest, because of our knowledge concerning upwind flight of male moths being dependent on contact with pheromone plume strands, that more attention needs to be paid to optimizing the flux within plume strands that shear off of any mating disruption dispenser's surface. By measuring the emission rates on a per-minute basis and measuring the plume strand concentrations emanating from the dispensers, it may help improve the ability of the dispensers to initiate upwind flight from males and initiate their habituation to the pheromone farther downwind than can otherwise be achieved. In addition, by optimizing plume strand flux by paying attention to the geometries and compactness of mating disruption mega-dispensers may help reduce the cost of mega-dispenser disruption formulations by improving their behavioral efficacy while maintaining field longevity and using lower loading rates per dispenser.

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Sex pheromone of blackheaded fireworm,Rhopobota naevana (Lepidoptera: Tortricidae), a pest of cranberry

Cited by 5 publications

References 4 publications

Delayed mating reduces fecundity of blackheaded fireworm, Rhopobota naevana, on cranberry

Delayed mating reduces fecundity of blackheaded fireworm, Rhopobota naevana, on cranberry

Blackheaded fireworm: Laboratory and field studies of its sex pheromone

Optimizing the Point-Source Emission Rates and Geometries of Pheromone Mating Disruption Mega-Dispensers

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