Effect of yellow light to the oviposition of jasmine flower borer, Hendecasis duplifascialis Hampson

Effect of yellow light to the oviposition of jasmine flower borer, Hendecasis duplifascialis Hampson was conducted in a farmer field located in Amphoe Nakhon Chaisi, Nakhon Pathom province during 1999 to 2000. In 1999, a yellow fluorescence light was set up about 1 metre high above jasmine plants. Illumination was done overnight during 6 p.m. to 6 a.m. in order to check the number of eggs, larvae, damaged and undamaged flowers found on jasmine plants located at different distances : 2, 4, 8, 16 and 40 metres far from the light source. The plants located in area 40 metres far from the post were the plants in the dark areas. The young jasmine flowers were collected from the fixed 8 jasmine plants located at each distance. The number of eggs collected from the locations 2, 4 and 8 metres far from the light source were 0.17+-0.23, 0.19+-0.33 and 0.09+-0.12 eggs per plant and had no significantly difference compared with the number of eggs collected from the plants in the dark which was 0.12+-0.11 eggs per plant. The number of eggs found on the flowers collected from the location 16 metres far from the light post was 0.06+-0.09 eggs per plant and was significantly different compared with the one collected from the dark. The sampling method studied in this experiment have to be improved because the sample plants were fixed and caused some plant samples had small number of flowers and could not get enough samples for study. In 2000, the trials had been repeated the year 1999. Total 50 young jasmine flowers were collected from the areas 4, 8, 12, 16 and 40 metres far from the light bulb, and observing the number of eggs, larvae, damaged and undamaged flowers had been done. The result showed that no significant difference for the number of eggs and larvae and the percentage of damaged flowers compared among different distances and areas in the dark. It should be concluded that the yellow light did not have any effect on the oviposition of jasmine flower borers.