Abstract
Leafrollers (Lepidoptera: Tortricidae) are major pests of pipfruit, largely because of the zero tolerance of their presence in, and damage to export fruit. A field trial was carried out in an apple orchard in Canterbury, New Zealand, to determine the influence of planting coriander (Coriandrum sativum L.) and buckwheat (Fagopyrum esculentum Moench.) on parasitism rates of leafrollers by Dolichogenidea tasmanica (Hymenoptera: Braconidae). Coriander (mean = 0.36 cocoons/shelter sites) significantly enhanced the parasitism rate compared with the herbicide-treated control (0.13). Buckwheat (0.21) had a similar but non-significant effect. The influence of floral resources on parasitoid longevity was evaluated in the laboratory. Parasitoids reared on a honey/water solution had the greatest longevity. A combination of buckwheat and coriander resulted in greater parasitoid longevity compared with either plant species alone. Incorporating flowering plants, such as coriander and buckwheat in the orchard understorey as part of an Integrated Fruit Production programme, may contribute to leafroller biocontrol by enhancing the abundance and longevity of their parasitoids.
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