摘 要：
小麦红吸浆虫的生活圈是大家都知道的,它分为地上和地下两个部分。其中在地上部分所经历的时间很短促,主要是它的幼虫在麦穗上成长的一段时间。正是由于幼虫在麦粒上成长,因而造成小麦生产上的损失。 研究这种害虫,除了解它的发生时期以外,必然要注意到这样几个问题:一是成虫发生的数量,二是幼虫在麦穗上的数量,三是幼虫对麦粒的为害。其中有关于成虫发生数
译 名：
STUDIES ON THE ORANGE WHEAT BLOSSOM MIDGE,SITODIPLOSIS MOSELLANA GEHIN. Ⅱ. THE LARVAL LIFE IN THE EARS OF WHEAT
作 者：
YOUNG BAINLEY;LEE CHEN-CHANG;Woo SHEH-MING Institute of Entomology, Academia Sinica
摘 要：
The larvae of orange wheat blossom midge inflict damage on the kernels of wheat. However,owing to their habitats being concealed under glumes, our knowledges about their development andtheir behaviour are vague and meager. The present paper deals with their larval life on the kernelsof wheat in the suburbs of Shanghai. The results may be briefly enumerated as follows: 1. Three instars are definitely known in the larval stage of the orange wheat blossom midge,and they may be easily distinguished by their caudal processes. The first instar is metapneustic inrespiratory system, while the second and the third instars are peripneustic. The sternal spatula, thecharacteristic thoracic armament in the larvae of the family Cecidomyidae, appears in the last instar. 2. The first two instars are active in feeding and growing: the first lasts 4--5 days and thesecond, 5--8 days. The third instar rests upon the kernel within the exuvium of the second andtakes no nourishment from the kernel. 3. The occurrences of larva on a single kernel in the suburbs of Shanghai are most solitary indistribution, just as those already observed by Barnes in England and by Wallengren in Sweden.The frequencies of occurrence in 1954--1957 were analyzed with respect to the levels of population.The higher the level of population in the field, the greater the number of kernels will be injured. 4. The damages to wheat grains are so profoundly manifested that even a single larva woulddestroy the entire grain. Indeed, we have encountered a high percentage of devastated grains(66.2%) each with a single larva in 1954. It is evident that the degree of damage is not primarilydetermined by the number of larvae feeding thereupon. The time of invasion may be of primeimportance. Histological sections of the attacked kernels give valuable hints about the type of injurymanoeuvered by the larvae of this midge, and the position of attack is also vital when it comes nearthe ventral furrow of the grain.
