Timothy F Vandervoet, D. Bellamy, Diane Anderson, R. MacLellan
{"title":"Trapping for early detection of the brown marmorated stink bug, Halyomorpha halys, in New Zealand","authors":"Timothy F Vandervoet, D. Bellamy, Diane Anderson, R. MacLellan","doi":"10.30843/NZPP.2019.72.316","DOIUrl":"https://doi.org/10.30843/NZPP.2019.72.316","url":null,"abstract":"The brown marmorated stink bug (BMSB) would have wide-ranging and likely devastating effects on New Zealand’s horticultural industries if it were to establish here. This insect has spread rapidly around the world, becoming pestiferous only a few years after detection; therefore, there will be limited time to develop management strategies to prevent damage if viable BMSB populations were to establish in New Zealand. Lures containing BMSB pheromone paired with 92 sticky panels were deployed near transitional facilities and other potentially high-risk entry points in the Auckland, Hawke’s Bay and Nelson regions. Traps were monitored fortnightly from November 2018 to April 2019 and all pentatomid species identified and enumerated. No BMSB were captured, but seven other pentatomid species were caught. Numbers and species varied among site, region and date. The phenology of the pentatomids captured supports reports of one to two generations occurring in pipfruitproduction regions depending on growing-degree days. The phenologies of the pentatomid species caught suggest that any control measures for prevention of fruit damage by BMSB would be limited to late summer. A number of recommendations for a BMSB monitoring programme are provided.","PeriodicalId":19180,"journal":{"name":"New Zealand Plant Protection","volume":"176 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76462337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Scheper, B. M. Fisher, J. K. Bowen, N. T. Amponsah, D. Hedderley
{"title":"Successive passaging through an apple host of six low-virulent Neonectria ditissima isolates increased virulence in one of them","authors":"R. Scheper, B. M. Fisher, J. K. Bowen, N. T. Amponsah, D. Hedderley","doi":"10.30843/NZPP.2019.72.300","DOIUrl":"https://doi.org/10.30843/NZPP.2019.72.300","url":null,"abstract":"Neonectria ditissima is a serious pathogen of apple. Low-virulent cultures of this fungus have been isolated from cankers, but how and why low-virulent isolates can infect apple is unknown. Rasp wounds on ‘Royal Gala’ trees were inoculated with agar plugs from six low-virulent N. ditissima isolates in a glasshouse. Neonectria ditissima was re-isolated 10 weeks after inoculation. Agar plugs from the re-isolated cultures were used to inoculate ‘Royal Gala’ trees again. After the second re-isolation, conidial suspensions of the original cultures and the 2 x 6 re-isolates were used to determine the virulence on ‘Royal Gala’ compared with field-collected conidia. Three cultures did not cause any lesions; neither did their re-isolates. The re-isolates of two cultures did not differ in virulence compared with the originals. However, the virulence of one isolate increased with each re-isolation, with the second re-isolation causing significantly more lesions, lesion development occurring faster and the lesions being larger than those caused by the original isolate. Therefore, the virulence of N. ditissima isolates can change over time, with loss or gain possibly being attributed to epigenetic and/or genetic changes in the genome.","PeriodicalId":19180,"journal":{"name":"New Zealand Plant Protection","volume":"118 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78246713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The current outbreak of stemphylium leaf blight of onion in New Zealand – identification of cause and review of possible risk factors associated with the disease","authors":"P. Wright, B. Searle, J. Tyson, K. Mellow","doi":"10.30843/NZPP.2019.72.254","DOIUrl":"https://doi.org/10.30843/NZPP.2019.72.254","url":null,"abstract":"During the 2017–18 growing season, significant outbreaks of leaf blight occurred in Pukekohe, Hawke’s Bay and Canterbury commercial onion fields. It was unknown if the causal agent was Stemphylium vesicarium, a pathogen already present in New Zealand that causes stemphylium leaf blight (SLB), or a new introduction of another Stemphylium species. Morphological and molecular characterisation methods were used to identify the pathogen present on diseased onion leaves. The possibility that climate may have been a contributor to the outbreak was evaluated using hourly temperature and relative humidity data, and comparing the 2017–18 growing season with the previous four seasons in these regions when no disease was observed. Our research indicates that the recent leaf blight outbreak in New Zealand was caused by S. vesicarium, and not the introduction of a novel species of Stemphylium. The warm, and wet summer of 2017–18 possibly contributed to the SLB outbreak.","PeriodicalId":19180,"journal":{"name":"New Zealand Plant Protection","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90348585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Factors affecting germination of great bindweed (Calystegia silvatica) seeds","authors":"K. Harrington, T. Gawn, C. Matthew, H. Ghanizadeh","doi":"10.30843/NZPP.2019.72.243","DOIUrl":"https://doi.org/10.30843/NZPP.2019.72.243","url":null,"abstract":"Great bindweed (Calystegia silvatica) invades riparian plantings in New Zealand but little is known about the factors influencing seed germination of this species, the number of seeds produced per flower or whether seed banks build up in the soil below infested sites. Dormancy-breaking treatments involving scarification and/or pre-chilling of seeds were evaluated. The effect of temperature on germination was also studied. The presence of viable seeds in capsules on vines and in the soil beneath established stands was quantified. Great bindweed seeds needed scarification but not a period of cold temperature to germinate. Germination occurred from 5oC to 25oC but germination was greater and more rapid at higher temperatures. Seed capsules contained an average of only 2.3 seeds, and the soil beneath plants had, on average, only 21.9 seeds/m2. Seeds were large with one thousand seeds weighing 43.4 g. Once the hard seed coat is broken, seeds will germinate readily at warmer times of the year, but seed production is not prolific so seeds might not be that important for spread of the species.","PeriodicalId":19180,"journal":{"name":"New Zealand Plant Protection","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75364158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Preferences of the wheat bug (Nysius huttoni) for particular growth stages of the potential trap crop, alyssum (Lobularia maritima)","authors":"S. Tiwari, D. Saville, S. Wratten","doi":"10.30843/NZPP.2019.72.269","DOIUrl":"https://doi.org/10.30843/NZPP.2019.72.269","url":null,"abstract":"The New Zealand endemic wheat bug, Nysius huttoni (Hemiptera: Lygaeidae), is a pest of brassica seedlings. However, it has a wide host range comprising almost all cultivated brassicas, cereals and many other cultivated crops, as well as weeds. The brassica alyssum (Lobularia maritima) is a potential trap crop of N. huttoni, having the potential to keep the bugs away from seedlings. Laboratory no-choice and choice tests evaluated the relative preference of N. huttoni for two major growth stages of alyssum – vegetative and flowering. In both bioassays, N. huttoni adults settled significantly more promptly on the flowering than on the vegetative stage. The same preference was evident for adult numbers settling. Survival was higher on the flowering (38%) than on the vegetative stage (28%), although this was not significant. The implications of these findings are important in the design of trap cropping protocols for N. huttoni management. Flowering alyssum in brassica fields can also potentially improve pest biological control and provide other ecosystem services that can contribute to mitigating diminished ecosystem functions in agriculture.","PeriodicalId":19180,"journal":{"name":"New Zealand Plant Protection","volume":"98 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77649480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Roadside mowing spreads yellow bristle grass (Setaria pumila) seeds further than by natural dispersal","authors":"T. James, Michael R. Trolove, C. A. Dowsett","doi":"10.30843/NZPP.2019.72.246","DOIUrl":"https://doi.org/10.30843/NZPP.2019.72.246","url":null,"abstract":"Yellow bristle grass is a highly invasive annual C4 pasture weed that has spread rapidly through many New Zealand dairying regions via seed dispersal. Seven trials were conducted on roadsides infested with yellow bristle grass to evaluate natural and mower-assisted dispersal. To trap seeds, yellow sticky traps were laid out at various intervals both perpendicular to and parallel to the road. Traps were in place for 24 h in the four natural dispersal trials but only for the event in the mowing trials. Seeds on the retrieved traps were counted and the seeds caught in the mower estimated. For natural dispersal, 90% of seeds fell within 0.5 m. When mown, 90% of the seeds fell within 2 metres in the direction of mowing and 80% within 20 cm in the perpendicular direction. More importantly, a small percentage of dispersed seeds were caught in the mower and presumably could subsequently fall off anywhere. Mowing mature yellow bristle grass on the roadside will result in accelerating seed dispersal along the roadside for many metres and potentially many kilometres.","PeriodicalId":19180,"journal":{"name":"New Zealand Plant Protection","volume":"223 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89161570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Williamson, P. Hulme, David A. Condor, H. Chapman
{"title":"Local adaptation in a New Zealand invader, Mimulus guttatus","authors":"M. Williamson, P. Hulme, David A. Condor, H. Chapman","doi":"10.30843/NZPP.2018.71.217","DOIUrl":"https://doi.org/10.30843/NZPP.2018.71.217","url":null,"abstract":"The New Zealand flora comprises proportionately more alien species than anywhere else on Earth. Many of these species are ‘sleeper’ species, currently not invasive but with the potential to become so. Understanding what traits lead to sleepers becoming invasive is a key question in invasion biology. One hypothesis is local adaptation — that is, selection pressures in an alien habitat select for certain genetic traits favouring species spread. In New Zealand, the semi-aquatic herb Mimulus gutattus, ‘monkey flower’, is already showing signs of becoming invasive and is widespread across the South Island, blocking waterways and ditches. A common garden experiment was used to test for local adaptation in 37 populations of monkey flower from 8 regions across the North and South Islands of New Zealand. Possible adaptations in plant physiology (including, fresh vs dry weight, flower size, and photosynthetic rate) were examined. Observable differences include significant differences in biomass and leaf morphology. Results to date indicate significant genetic differences among New Zealand monkey flower populations. This is indicative of invasive potential.","PeriodicalId":19180,"journal":{"name":"New Zealand Plant Protection","volume":"11 1","pages":"349-349"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81996705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Developing apple leafcurling midge rearing techniques","authors":"A. Hawthorne, D. E. Hartnett","doi":"10.30843/NZPP.2018.71.201","DOIUrl":"https://doi.org/10.30843/NZPP.2018.71.201","url":null,"abstract":"Apple leafcurling midge (Dasineura mali; ALCM) is considered a quarantine pest in some of New Zealand’s valuable export markets. Research into alternatives to methyl bromide as a fumigant requires a mass rearing programme to provide large numbers of all life stages. Our aim was to focus on developing an understanding of the environmental conditions that break ALCM diapause and facilitate ALCM oviposition. A trial was conducted comparing ALCM oviposition rates on apple seedlings in a controlled temperature room versus a shade house in ambient conditions over the summer months. Additionally, long day length and high humidity conditions were tested to break the diapause of ALCM cocooning larvae. Oviposition rates on young apple seedlings were similar in the controlled environment room and the shade house; however, apple seedlings grew better in the shade house due to lower incidence of powdery mildew. Adults emerged from ALCM cocoons that had been in diapause for five months and then held at 20.9°C for seven days. Conditions to break ALCM diapause have been determined. Seedlings at the six- to eight-leaf stage have the potential to provide an oviposition substrate. Further investigations are required into artificial oviposition substrates and the development of a larval diet to mass rear ALCM larvae.","PeriodicalId":19180,"journal":{"name":"New Zealand Plant Protection","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89624771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Bullians, D. Teulon, R. Laws, S. Perry, Gary Hill
{"title":"Biosecurity partnership and collaboration: key similarities and differences between the Australia and New Zealand plant-biosecurity government-industry agreements","authors":"M. Bullians, D. Teulon, R. Laws, S. Perry, Gary Hill","doi":"10.30843/NZPP.2018.71.212","DOIUrl":"https://doi.org/10.30843/NZPP.2018.71.212","url":null,"abstract":"New Zealand and Australia have each established legal partnerships between government and industry to improve biosecurity outcomes. Both partnerships take a collaborative approach to build capability and capacity to manage biosecurity risk across the biosecurity system. Key differences between the New Zealand and Australian systems include: the scope of responsibilities and accountability for management of biosecurity pests; governance arrangements; and cost sharing. Key similarities include: a shared role in response decision making; shared costs for pest eradication; advanced agreement on the potential liabilities surrounding pest eradication; provision for compensation to growers for direct costs incurred during an eradication response; minimum commitments to maintain capability and capacity; and an established basis for a transparent, consistent and equitable partnership. The approach taken by both countries encompasses the view that biosecurity outcomes will be improved by building genuine industry—government partnerships. In New Zealand, successes include development of operational agreements, strategies for fruit fly and brown marmorated stink bug, and completion of readiness activities for future incursions of these pests.","PeriodicalId":19180,"journal":{"name":"New Zealand Plant Protection","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90052530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. V. Marroni, K. Boyd-Wilson, R. Campbell, M. McNeill, D. Teulon
{"title":"Location of overseas botanic gardens with New Zealand Myrtaceae in relation to myrtle rust occurence","authors":"M. V. Marroni, K. Boyd-Wilson, R. Campbell, M. McNeill, D. Teulon","doi":"10.30843/NZPP.2018.71.215","DOIUrl":"https://doi.org/10.30843/NZPP.2018.71.215","url":null,"abstract":"New Zealand’s productive systems and natural ecosystems depend on a robust biosecurity framework to exclude invasive pests, diseases and weeds. Risk assessment is an important component of this biosecurity framework identifying potential threats posed by invasive organisms to specific plants and plant systems before they arrive in New Zealand. A major challenge in risk assessment is determining the potential impact of a pest or disease when it is not present in New Zealand. The International Plant Sentinel Network (IPSN), a network of botanic gardens and arboreta, aims to provide early warning of new and emerging tree and plant pests and diseases. The utility of the IPSN in providing information on the potential impact of myrtle rust for New Zealand’s indigenous Myrtaceae. Botanic gardens were identified around the world with New Zealand Myrtaceae and where myrtle rust is present. This is a first step in an ex-post study on the use of sentinel or expatriate plants as a biosecurity risk-assessment tool. The approach could be extended to other plant pathogens or pests to explore their impact on New Zealand indigenous or cultivated plant species overseas.","PeriodicalId":19180,"journal":{"name":"New Zealand Plant Protection","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82760967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}