赣南桉树品种(系)对桉树枝瘿姬小蜂的抗性研究

Study on Resistance of Different Eucalyptus Varieties to Leptocybeinvasain Southern Jiangxi

桉树枝瘿姬小蜂已成为危害赣南桉树枝叶的主要害虫,已进入爆发阶段,严重威胁着赣南桉树产业的发展,选育优良的桉树抗性品种(系)是防治该蜂的最有效方法之一。以目前江西赣南推广面积较大的7个桉树品种(系)为试材,采用野外调查和室内幼苗接虫抗性鉴定等方法,选取样枝平均虫瘿数、有虫瘿株率、丛枝率等指标进行综合评价,研究这些品种(系)对桉树枝瘿姖小蜂的抗性。结果表明:不同桉树品种(系)对桉树枝瘿姬小蜂的抗性不同,7个桉树品种(系)对桉树枝瘿姬小蜂的抗性从高到低顺序为:柠檬桉>巨尾桉GL9>赤桉>大叶桉≥巨桉>窿缘桉>巨园桉DH201-2,其中柠檬桉为高抗虫品种,林间调查未发现有虫瘿,巨尾桉GL9属中抗品系,受害较轻,而巨园桉DH201-2为高感虫品系,受害严重。

Leptocybe invasa has become a major pest that damage the eucalypt branches and leaves in Gannan （South of Jiangxi Province）,and has entered the stage of the outbreak, and has become a serious threat to the development of Gannan eucalypt industry. Breeding of Eucalyptus resistant varieties （lines） is one of the most effective methods of preventing this pest. Taking seven major commercial Eucalyptus spp. varieties （lines） in South Jiangxi province as test material ,and based on these varieties （lines） of field investigation and indoor seedling insect resistance identification, comprehensive evaluation with these index of average amount of branch galls, rate of gall plants and rate of fascicled symptom,these varieties （lines） resistance to Leptocybe invasa was researched. The results showed that the pest resistance of different Eucalyptus varieties （lines） to L. invasa was significant difference. Resistance of these varieties （lines） from high to low order,E, citriodora 〉E. grandis ×E. uroph ylla GL9〉E. carnaldulensis 〉 E. robusta ≥E. grarutis 〉 E. exserta 〉 E. grandis × E. tereticornis DH201-2. Among them,E, citriodora was high resistant varieties, no gall; GL9 was resistant strains, suffer a lighter 〉 but,DH201-2 was a highly susceptible strains, be serious damage.