2005
DOI: 10.1080/09583150500136022
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Biological assessment of Macrocentrus linearis and Apanteles polychrosidis (Hymenoptera: Braconidae) as parasitoids of the obliquebanded leafroller, Choristoneura rosaceana (Lepidoptera: Tortricidae)

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Cited by 10 publications
(12 citation statements)
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“…As parasitoids can kill, and in some cases suppress their host's feeding, such high parasitism can result in decreased leafroller population densities and therefore decreased fruit damage. Orchardists of organically managed orchards in this region frequently rely on the parasitoids to suppress their leafroller populations and it would be advantageous to augment the incidence of common efficacious parasitoid species of the leafroller complex in formerly chemically managed orchards which no longer require multiple codling moth targeted chemical sprays (Cossentine et al 2004b(Cossentine et al , 2005. In order to augment the appropriate parasitoid species it is necessary to determine the parasitoid complex indigenous to specific orchard agroecosystems and it is unrealistic to assume that the parasitoid species identified as key parasitoids of the southern leafroller complex are the same as are found in apple orchards in the north Okanagan valley where the complex shifts to a predominant A. rosanus population as well as moderate C. rosaceana and smaller P. limitata populations.…”
Section: Introductionmentioning
confidence: 99%
“…As parasitoids can kill, and in some cases suppress their host's feeding, such high parasitism can result in decreased leafroller population densities and therefore decreased fruit damage. Orchardists of organically managed orchards in this region frequently rely on the parasitoids to suppress their leafroller populations and it would be advantageous to augment the incidence of common efficacious parasitoid species of the leafroller complex in formerly chemically managed orchards which no longer require multiple codling moth targeted chemical sprays (Cossentine et al 2004b(Cossentine et al , 2005. In order to augment the appropriate parasitoid species it is necessary to determine the parasitoid complex indigenous to specific orchard agroecosystems and it is unrealistic to assume that the parasitoid species identified as key parasitoids of the southern leafroller complex are the same as are found in apple orchards in the north Okanagan valley where the complex shifts to a predominant A. rosanus population as well as moderate C. rosaceana and smaller P. limitata populations.…”
Section: Introductionmentioning
confidence: 99%
“…Any of the four parasitoid species may not have been responding to kairomones resulting from obliquebanded leafroller larvae feeding on apple foliage and this aspect of the trials needs to be better understood. The fecundity of the two braconids as measured in laboratory trials (Cossentine et al, 2005) suggests that parasitism should have been higher in the field trials. It is possible that the time of year the trials were carried out may have been inappropriate for these two species, resulting in poor parasitism and the relatively warm temperatures under which the M. linearis were released would not be recommended for future trials.…”
Section: Discussionmentioning
confidence: 99%
“…12.5 ± 2.4 a 19.7 ± 4.6 a 14.8 ± 3.8 a na na na Parasitized by other species 7.8 ± 3.1 a 19.1 ± 6.3 ab 29.3 ± 3.8 b na na na Dead 3.3 ± 1.1 b 1.1 ± 0.8 ab 0 ± 0 a na na na Parasitized WEEK 2 7.4 ± 3.3 a 13.2 ± 3.4 a 11.9 ± 4.4 a 0 ± 0 0 ± 0 0 ± 0 Parasitized by other species 9.1 ± 5.5 a 16.7 ± 4.1 a 21.6 ± 6.6 a 6.0 ± 3.0 a 11.1 ± 4.6 a 4.4 ± 2.0 a Dead 3.8 ± 1.4 a 1.1 ± 0.8 a 0.2 ± 0.2 a 13.7 ± 2.7 b 5.5 ± 2.4 a 0 ± 0 a Parasitized Honey-water was provided and most females would be expected to survive for at least the first week of the study, assuming that they could find this food, as females of all four parasitoid species survived for means of at least 20 days in laboratory trials (Cossentine et al, 2004b(Cossentine et al, , 2005(Cossentine et al, , 2007. Conditions would be less amiable in the orchard environment and it is acknowledged that laboratoryreared parasitoids may have modified intrinsic foraging behaviour and may not respond as effectively to hosts on leaves as they do to hosts on artificial diet (Vet, 2001).…”
Section: Discussionmentioning
confidence: 99%
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