Specie. | Average symptoms (%).^{z} (treated minus control) Time after the first year's spraying ende | Survival of treated plants (expressed as % survival of control plants).^{y} Time after the first year's spraying ende | |||||
---|---|---|---|---|---|---|---|

2 weeks | 4 weeks | 17 weeks | 17 weeks | 1 year | 2 years | 2½ years | |

P. thunbergii | 0 a | 0 a | 3 a | 100 | 100 | 89 | 89 |

P. ponderosa | 1 ab | 2 ab | 6 ab | 100 | 95 | 95 | 95 |

P. nigra | 5 bc | 3 abc | 5 ab | 95 | 85 | 89 | 89 |

P. strobiformis | 6 bcd | 6 bcd | 37 bc | 90 | 80 | 75 | 65 |

P. cembra | 6 bcd | 5 bcd | 24 abc | 80 | 59* | 47* | 6* |

P. densiflora | 7 cd | 11 cde | 27 abc | 57* | 46* | 32* | 32* |

P. aristata | 7 cd | 21 e | 43 c | 50* | 43* | 38* | 17* |

P. parviflora | 11 cde | 25 e | 46 c | 63 | 71 | 73 | 40* |

P. peuce | 12 cde | 22 e | 28 abc | 67 | 50* | 33* | 17* |

P. resinosa | 14 de | 17 de | 42 c | 47* | 42* | 37* | 26* |

P. sylvestris | 14 de | 23 e | 33 bc | 90 | 80 | 70* | 60* |

P. banksiana | 18 ef | 17 de | 44 c | 68 | 44* | 22* | 11* |

P. strobus | 27 f | 45 f | 85 d | 40* | 40* | 25* | 15* |

↵z Mean separation within columns by Duncan’s New Multiple Range Test, 5% level. Numbers followed by the same letter within columns not considered significantly different.

↵y An asterisk indicates a significant decrease at the 5% level in the number of seedlings surviving the salt spray compared to those surviving the water spray treatment.