scholarly journals Minor components modulate sensitivity to the pheromone antagonist Z11-14:Ac in male lightbrown apple moth, Epiphyas postvittana (Lepidoptera: Tortricidae) in the field

2018 ◽  
Vol 71 ◽  
pp. 293-298
Author(s):  
Rachael M. Horner ◽  
Thomas E.S. Sullivan ◽  
Andrew M. Sporle ◽  
Lloyd D. Stringer ◽  
Lee-Anne M. Manning ◽  
...  
Keyword(s):  
Antagonistic Effect ◽  
Epiphyas Postvittana ◽  
Minor Components ◽  
Two Component ◽  
Tetradecenyl Acetate ◽  
Pheromone Antagonist ◽  
Lightbrown Apple Moth ◽  
Horticultural Pest ◽  
Minor Compounds ◽  
Pair Level

Epiphyas postvittana is a major horticultural pest in many countries, including New Zealand. Recently, two minor components (E)-11-tetradecen-1-ol and (E)-11-hexadecenyl acetate were found to increase the attraction of a previously identified two-component sex pheromone (95:5 blend of (E)-11-tetradecenyl acetate [E11-14:Ac] and (E,E)-9,11-tetradecadienyl acetate [E9,E11-14:Ac]) of Epiphyas postvittana. We hypothesised that the interaction between these minor components and the behavioural antagonist (Z)-11-tetradecenyl acetate (Z11-14:Ac) would modulate its antagonistic effect. The effect of increasing the ratio (0.5—10%) of Z11-14:Ac was tested in traps baited with E11-14:Ac and E9,E11-14:Ac (95:5), with or without the addition of the two minor compounds. Catch decreased as the percentage of Z11-14:Ac increased (χ2=108.74; d.f.=9; P<0.001). Overall, more moths were caught in traps baited with four- vs two-component lures (χ2=9.81; d.f.=1; P=0.002); in pair-level comparisons, significant differences in catch number between the two- and four-component lures were observed when the E11-14:Ac : Z11-14:Ac ratio was 99:1 (P=0.031) or 98:2 (P=0.047). The addition of the two minor components mitigated the reduced catch effect due to lower proportions of E11-14:Ac and the presence of 1—2% antagonist.

scholarly journals Recent introduction and establishment of the leafroller parasitoid Trigonospila brevifacies (Hardy) (Diptera Tachinidae) in Nelson

2001 ◽  
Vol 54 ◽  
pp. 33-36
Author(s):  
P.W. Shaw ◽  
P. Lo ◽  
D.R. Wallis
Keyword(s):  
Fourth Instar ◽  
Biocontrol Agents ◽  
Research Centre ◽  
Epiphyas Postvittana ◽  
Natural Distribution ◽  
Laboratory Colony ◽  
Important Pest ◽  
Successful Establishment ◽  
Lightbrown Apple Moth ◽  
Natural Dispersal

To assist the natural distribution of the leafroller parasitoid Trigonospila brevifacies to horticultural areas in the Nelson region 181 T brevifacies pupae and 329 adults were released in 1999 at four sites adjacent to apple orchards near Motueka Release material was supplied from fieldcollected parasitoids in Hawkes Bay and a laboratory colony held at the Mt Albert Research Centre in Auckland Successful establishment of the parasitoid was recorded at all four sites and at a nearby nonrelease site in 2000 In 2000 319 of fourth instar and older larvae were parasitised by T brevifacies while in 2001 parasitism was 1166 Important pest tortricid species including Epiphyas postvittana (Walker) (lightbrown apple moth) were among the hosts The successful establishment of T brevifacies in Nelson and its further natural dispersal will increase the potential for the reduction of economically important leafroller species by biocontrol agents

scholarly journals Parasitoids of leafrollers (LepidopteraTortricidae) from scrub vegetation near horticultural areas in Nelson

2015 ◽  
Vol 68 ◽  
pp. 193-196
Author(s):  
P.W. Shaw ◽  
D.R. Wallis
Keyword(s):  
Host Plants ◽  
Epiphyas Postvittana ◽  
Parasitoid Species ◽  
Lightbrown Apple Moth

Leafroller larvae and pupae were collected during timed searches in January and April 2013 from host plants at six scrub vegetation sites in two Nelson horticultural districts approximately 40 km apart The numbers of leafrollers and parasitoid species recovered were similar in both districts Most of the leafroller larvae collected were Epiphyas postvittana (Walker) (lightbrown apple moth LBAM) and most of these were found on gorse and broom In total 293 larvae and 11 pupae were reared successfully with 39 parasitism A wide diversity of parasitoids was recovered comprising 10 species from five families with Dolichogenidea tasmanica (Braconidae) the most common (80) The diversity of parasitoids and parasitism of leafrollers in unmanaged environments outside orchards may help to reduce leafroller pressure and the risk of fruit infestation in surrounding commercial orchards

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