刺桐姬小蜂虫瘿密度与刺桐受害肿大程度关系

Relationship between the gall density of erythrina gall wasp and swelling degree of infested parts of Erythrina variegata var. orientalis

采用采样测定的方法,研究了金脉刺桐Erythrina variegata var. orientalis(L.)Merr.上刺桐姬小蜂Quadrastichus erythrinae Kim虫瘿密度与受害部位肿大程度的关系。结果表明:刺桐姬小蜂危害后刺桐受害部位明显肿大,叶柄、枝条断面面积可增大到5～9倍;刺桐不同受害部位的肿大程度与虫瘿密度之间存在明确关系,建立了描述叶片上虫瘿总体积或枝条、叶柄肿大面积与虫瘿密度之间关系的幂方程;随着虫瘿密度增大,单个虫瘿对器官肿大程度的贡献越来越小,两者间关系也可用幂方程描述。

The study was made with sampling and determination methods. The result showed the infested parts of Erythrina variegata var. orientalis swelled obviously and the cross section area of petioles and new branches was 5-9 times larger. The relationships between the gall density of erythrina gall wasp and swelling degree of the infested parts were definite and the power equation describing the relationship between the swelling area of petioles and new branches or total volume of galls in leaves and gall density was constructed. The contribution of single gall to the swelling went down with the increase of the gall density and their relationships could be described with power equation, too.