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对８１个以尾叶桉为母本的种间控制授粉家系和３个母本的自由授粉家系进行苗期青枯病菌接种试验表明，接种后母本家系抗病性都较差，种间控制授粉家系间发病指数和死亡率有差异，初步筛选出１个特抗家系和４９个抗性家系。以家系抗病性评价父本树种，细叶桉、赤桉、窿缘桉、雷林一号桉和粗皮桉选育潜力较好，巨桉、巨尾桉和柳桉则较差。对抗性、易感和高感抗病水平各３个种间控制授粉家系进行接种前和接种后过氧化氢酶活性测定表明，家系苗期青枯病抗性与接种前的酶活性相关不显著，但与接种后酶活性上升的幅度呈强正相关，抗性家系在接种病菌后酶活性上升幅度最大，易感家系较小，而高感家系则更小。苗期接种青枯病菌后，杂种桉过氧化氢酶活性上升的幅度可作为早期抗病选育的一个重要的辅助依据。
Inoculation of 81 bacterial wilt pathogens in interspecific pollination pedigrees and 3 pollination families with interspecific pollination of 81 Eucalyptus urophylla as the female parent showed that the resistance of the parents was poor after inoculation, Pedigree incidence index and mortality were different, initially screened a special anti-pedigree and 49 resistant pedigrees. Eucalyptus globulus, Eucalyptus urophylla, Eucalyptus urophylla, Eucalyptus globulus and Eucryptopus pumilum were the best candidates for the evaluation of disease resistance in family lines. The potential of Eucalyptus grandis, Eucalyptus grandis and Eucalyptus globulus was poor. The results of catalase activity test before and after inoculation showed that there was no significant correlation between resistance to bacterial wilt and resistance to bacterial wilt in inbred lines before inoculation , But there was a strong positive correlation between the increase of enzyme activity after inoculation. The resistant strains showed the largest increase in enzyme activity, the susceptible pedigree and the susceptible pedigree. Seedling inoculation of bacterial wilt, the hybrid eucalyptus catalase activity increased amplitude as early resistance breeding an important ancillary basis.