New Zealand Plant Protection 69 (2016): 310-317
Mastrus ridens is a gregarious ectoparasitoid and Liotryphon caudatus is a solitary ectoparasitoid of cocooned codling moth larvae. These two parasitoid species could potentially compete for resources because they oviposit and develop on the same life-stage of their host. Competition experiments in the laboratory showed that females of both species oviposited into host cocoons regardless of previous parasitism, but adults of only one species ever emerged. Liotryphon caudatus larvae were highly aggressive. They preyed upon eggs and larvae of M. ridens, as well as conspecifics, such that only a single adult L. caudatus emerged. Mastrus ridens larvae survived competition with L. caudatus if they had a sufficient time to develop to a size that could attack L. caudatus eggs. However, L. caudatus was often still able to outcompete M. ridens even when M. ridens eggs were laid first. Mastrus ridens hyper-parasitised L. caudatus larvae that had themselves cocooned within the host cocoon, but no parasitoids emerged. Liotryphon caudatus out-competed M. ridens in an enclosed space, but that ability in a natural ecosystem remains to be investigated.
Keywords: Cydia pomonella, Liotryphon caudatus, Mastrus ridens, interspecific competition, biological control..
|Longevity and fecundity of laboratory-reared Liotryphon caudatus, an ectoparasitoid of codling moth|
V.A. Davis, W.R.M. Sandanayaka and J.G. Charles (2016)
New Zealand Plant Protection 69: 318
|Influence of cold storage on survival and fitness of Mastrus ridens, an ectoparasitoid of codling moth|
W.R.M. Sandanayaka, V.A. Davis, A. Chhagan, P.G. Connolly and J.G. Charles (2015)
New Zealand Plant Protection 68: 197-203
|The distribution of Liotryphon caudatus, a parasitoid of codling moth (Cydia pomonella) in Hawke's Bay apple orchards|
L.M. Cole and J.T.S. Walker (2011)
New Zealand Plant Protection 64: 222-226
|Colony optimisation of Mastrus ridens (Hymenoptera: Ichneumonidae), a potential biological control agent of codling moth in New Zealand|
W.R.M. Sandanayaka, A. Chhagan, N.E.M. Page-Weir and J.G. Charles (2011)
New Zealand Plant Protection 64: 227-234
Copyright © 2016 New Zealand Plant Protection Society (Inc.).