Neonectria ditissima conidium production and release in planta

  • Monika Walter Plant & Food Research
  • Charles E. Chevalier Ecole Nationale Supérieure d'Agronomie et des Industries Agroalimentaires
  • Lauren Turner Plant & Food Research
  • Rebecca E. Campbell Plant & Food Research
Keywords: spore production, spore release, Nectria galligena

Abstract

Neonectria ditissima, the causal agent of European canker in apples, conidia are available year-round in the Tasman region of New Zealand. Spore production and release in apple trees were quantified during natural and artificial rain events. Rain traps captured spores over 18 rain events (July–August 2017) from European canker lesions (excised and in planta) derived from ‘Royal Gala’ picking wound and rasp wound infections. Rain traps were monitored regularly to determine spore release over time. Differences in the number of conidia produced from lesions on the tree and excised lesions re-mounted in the tree were not significant. Lesions arising from picking wounds produced 7.2 times more spores on average than lesions arising from rasp wounds. Most spores were released within the first hour of rain and total spore release followed a logarithmic curve. Rain duration × volume of water determined the rate of conidia release. Excised lesions are suitable to study the effect of biotic and abiotic drivers on spore production. 

References

Alves SAM, Nunes CC 2017. Seasonal susceptibility of apple trees to Neonectria ditissima wound infections. New Zealand Plant Protection 70: 73–77. https://doi.org/10.30843/nzpp.2017.70.30

Amponsah NT, Walter M, Beresford RM, Scheper RWA 2015. Seasonal wound presence and susceptibility to Neonectria ditissima infection in New Zealand apple trees. New Zealand Plant Protection 68: 250–256.

Amponsah NT, Walter M, Scheper RWA 2017. Factors affection European canker spore release and availability in New Zealand apple orchards. New Zealand Plant Protection 70: 78–86. https://doi.org/10.30843/nzpp.2017.70.32

Butt DJ, Gunn ND, Xu XM 1994. Release of Nectria galligena spores from apple cankers. Norwegian Journal of Agricultural Sciences. No 15 Supplement, 309–316.

Campbell RE, Roy S, Curnow T, Walter M 2016. Monitoring methods and spatial patterns of European canker disease in commercial orchards. New Zealand Plant Protection 69: 213–220.

Dan LJ, Doust JL, Eaton GW 1982. The effect of European canker and its spatial pattern on four apple cultivars in British Columbia. Journal of Applied Ecology 19: 603–609. https://doi.org/10.2307/2403492

Swinburne TR 1975. European canker of apple. Review of Plant Pathology 54: 787–799.

Walter M, Campbell RE, Amponsah NT, Scheper RWA, Butler RC 2017. Evaluation of biological and agrichemical products for control of Neoncectria ditissima conidia production. New Zealand Plant Protection 70: 87–96. https://doi.org/10.30843/nzpp.2017.70.33

Walter M, Roy S, Fisher BM, Mackle L, Amponsah NT, Curnow T, Campbell RE, Braun P, Reinecke A, Scheper RWA 2016. How many conidia are required for wound infection of apple plants by Neonectria ditissima? New Zealand Plant Protection 69: 238–245.

Walter M, Stevenson OD, Amponsah NT, Scheper RWA, Rainham D, Hornblow C, Kerer U, Dryden G, Latter I, Butler RC 2015. Control of Neonectria ditissima with copper based products in New Zealand. New Zealand Plant Protection 68: 241–249.

Weber RWS 2014. Biology and control of the apple fungus canker Neonectria ditissima (syn. N. galligena) from a Northwestern European perspective. Ewerbs-Obstbau: https://doi.org/10.1007/s10341-014-0210-x. https://doi.org/10.1007/s10341-014-0210-x
Published
2018-07-29
How to Cite
Walter, M., Chevalier, C., Turner, L., & Campbell, R. (2018). Neonectria ditissima conidium production and release in planta. New Zealand Plant Protection, 71, 174-179. https://doi.org/10.30843/nzpp.2018.71.131
Section
Vol 71 Apple Pathogens 2018