New Zealand Plant Protection 66 (2013): 162-169
Analysis of kiwifruit industry pest monitoring and spray diary data showed increases in the incidence of leafroller larvae on fruit during crop monitoring in the 2011/12 season in regions with the virulent strain of the disease Pseudomonas syringae pv. actinidiae (Psa-V). Four factors were considered as explanations: Psa-V infection and its effects on plant defences, leafroller sprays, Psa-V sprays and leafroller sampling. The most plausible cause of the increased leafroller incidence is Psa-V infection. A putative mechanism is hormonal 'cross-talk' resulting in a trade-off between pest and pathogen resistance. The susceptibility of vines to leafrollers in Psa-V-infected regions appears to persist for several weeks longer after fruit set than in uninfected vines. The paper discusses the need to develop a better understanding of the interactions of biotic and abiotic stressors on plant defence responses to pests and diseases and to incorporate these into a plant-defence-centred approach to Integrated Pest Management.
Keywords: kiwifruit, Psa, leafrollers, plant resistance, IPM, cross-talk.
|A comparison of lepidopteran damage to 'Hort16A' and 'Hayward' kiwifruit|
C.E. McKenna and P.S. Stevens (2007)
New Zealand Plant Protection 60: 254-258
Copyright © 2013 New Zealand Plant Protection Society (Inc.).