摘要
芽梢斑螟是马尾松二年生球果的重要害虫。根据种子园雄花发生特点，研究了芽梢斑螟越冬幼虫转移危害及其在树冠和林中的分布规律。结果表明，７轮生枝的马尾松树冠上，芽梢斑螟越冬幼虫集中侵害第六、七轮生枝上的二年生球果，球果被害率达５３．６％，幼虫数量占总数的５８．８％。种子园内不同无性系有少雄（花）、中雄和多雄树之别，芽梢斑螟越冬幼虫转移后的危害率及其数量分布，随马尾松雄梢率的增加呈递增的趋势。危害率（ｙ１）和幼虫数量（ｙ２）与雄梢率（Ｘ）的回归方程式分别为ｙ１＝０．６６０＋０．４７３Ｘ，ｙ２＝－０．８２９＋０．
Dioryctria yiai Mutura et Munroe is an important insect pest damaging 2 -year-old cone of Pinus massoniana Lamb in China. The transfer damage of the overwintered larvae of the pest and its density estimate were studied on the basis of the reproductive charcteristics of the male flower of Pinus massoniana in seed or-chard.The results showed that on the 7 whorls crown of host trees,the overwintered larvae distributed principally to 2 - year - old cone of the 6th and 7th whorls, the rate of the cone damaged reached 53.6%, the percentage of the larvae reached 58.8% The larval damaged rate and the number of larvae increase with the increase of the inflorescence rate. The relationship between the darnaged rate of 2 - year - old cone (y1) , number of larvae (y2) and the male inflorescence rate (X) were estimated as y1=0.660+0.473X,y2=0.829+0.303X, respectively.
出处
《林业科学》
EI
CAS
CSCD
北大核心
1997年第3期247-251,共5页
Scientia Silvae Sinicae
关键词
芽梢斑螟
马尾松
雄梢率
危害率
幼虫分布
Dioryctria yiai Mutura et Munroe, Pinus massoniana Lamb., Male inflorescence rate , Damaged rate , Larval distribution
