Morphological Differentiation Of Carposina Sasakii Matsumura And C. Coreana Kim(Lepidoptera: Carposinidae)

The peach fruit moth, Carposina sasakii Matsumura, is an economically majorpest in East Asia, with its larvae boring in the fruits of plants, frequently causingserious loss. It form host races due to its significantly seasonal difference of lifehistory from various plant. In the literature review part, several species concepts,speciation mechanisms, and methods of geometric morphometrics were introduced;the research progress of C. sasakii was presented. Diversity of larval chaetotaxybetween host races of C. sasakii and C. coreana were analyzed throughmorphometrics. The eggshells of different host races of C. sasakii, and sensilla ofantenna from both genders were compared by using scanning electron microscopy.The results of morphometrics analysis showed that procrustes distances weresignificant between C. sasakii and C. coreana in A1, A7, A8, and A9. But in A8, C.coreana was distinguished from the apple (Malus pumila) and peach (Prunus persica)host races of C. sasakii by scatted plot of principal component analysis. In centroidsize analysis, C. sasakii from apple was the largest on average, the peach host raceswas the second, C. coreana was the smallest. Sizes of the apple and peach host raceswere significantly different from other host races, but not significant between them.The sizes among C. coreana and the host races of C. sasakii were significant expect inA8of midget crabapple (Malus micromalus).The results of eggshells using scanning electron microscopy displayed that theupper part has four micropyles, surrounded by lotus-like decoration, shaped like afunnel. The eggshell of apple host race was different from apricot (P. armeniaca) andmidget crabapple host race mainly on Y-shaped protuberances and granular process.Y-shaped protuberances of apple host race are short and its terminal area has rarevillus. Granular processes of apricot and midget crabapple host race are arrangedregularly. Its marginal small granule has blunt end and range closely together.Granular processes of midget crabapple host race were the intermediate between theapple and apricot host races. It clearly indicated that the three host races of C. sasakii have differentiated morphologically in their eggs.There are B hm’s bristles, sensilla styloconica, sensilla auricillica, sensillacoeloconica, sensilla chaetica, sensilla basiconca, sensilla squamiformia, sensillatrichodea in the antennae of C. sasakii. The number and distribution of sensillabetween male and female were different.In the discussion part, larval chaetotaxy is compared with other carposinid moths,and the morphology and function of egg are discussed. Morphological differentiationof C. sasakii in different host races is in the initial stage.