Abstract

Red needle cast (RNC) is the current and major needle disease of Pinus radiata D. Don (radiata pine) in New Zealand, caused by Phytophthora pluvialis. The effects of the disease on forest productivity are likely to be large and the loss of volume could be as high as 20%. We used a tactical desired gains approach in which strict control of predicted progeny mean RNC was imposed in an otherwise normal implementation of optimal contributions selection through mate selection. This was tested in a simulated population of radiata pine. The two trait objective included diameter at breast height as an indication of volume growth and modulus of elasticity measuring wood stiffness as an important selection criterion for wood quality. The simulation population consisted of 50 females and 50 males where the long-term response for 50 years on the two trait objective was investigated while reducing RNC on a defined trajectory, and conserving genetic diversity. Keywords: Genetic gains, genetic diversity, optimal contribution, red needle cast, radiata pine

Mari Suontama, Brian Kinghorn, Wallace Cowling, Heidi Dungey

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Electronic Poster Session - Biology - Disease Resistance 3, , 375, 2018
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