›› 1997, Vol. 40 ›› Issue (1): 58-61.

• RESEARCH PAPERS •

A STUDY ON THE RHYTHMIC CHANGES OF PHOTOTACTIC BEHAVIOUR AND COMPOUND EYE STRUCTURE OF ADULT CORN BORER

Guo Bingqun Li Shiwen

• Online:1997-02-20 Published:1997-02-20

Abstract: Comparative studies of phototactic behaviour and ommatidium fine structure are made with behaviour test and microscopy on adult corn borer, Ostrinia furnacalis(Guen6e). The moths were disposed of dark adaptation in the darkroom in different time, in the night or in the day. The results are as follows. (1)The percentage of phototactic reaction of the moths which are disposed of dark adaptation in the night is much higher than that disposed in the daytime. From 5 behaviour tests with different illuminance, the percentage of the highest phototactic response is 80%, the lowest 23%, and the average 48% for the former, and 35 %, 10%and 21% respectively for the latter. (2)The distribution of the screeningpigment in the compound eye is nearly the same between the night dark adaptation and the day dark adaptation; however, the distribution area of nuclei of retinula cells is obviously different, which implies the natural rhythm of structure changes in the ommatidia of adult cornborer. The relationship between the rhythmic changes of the structure of compound eye andphototactic responses is discussed.