Relations Between Sexual Maturation and Field Distribution of Female Oriental Fruit Fly Bactrocera dorsalis (Hendel)

• Main Authors: Guang-Zu Wang, 王光祖
• Other Authors: Chiou-Nan Chen
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/70480493562361892629

碩士 === 國立臺灣大學 === 昆蟲學研究所 === 87 === Methyl eugenol poison bait as male attractant and protein hydrolysate in the McPhail trap as female attractant were used to trap the oriental fruit fly Bactrocera dorsalis (Hendel) in the field in order to study the distribution of both sexes. Male flies tended to distribute more diversely than female flies. Many male flies were trapped in wild bushes away from the orchard; while female flies were highly concentrated in the guava orchard area, and seldom found outside the orchard. Immature female flies in the orchard were much less than the mature ones. But at the edge of the orchard immature females were more abundant than the mature ones. This phenomenon is due to the host-searching activity of the egg-bearing females and the less attractiveness of the fruits to the immature females, as evident from laboratory experiment, which proved that both mature and immature females were attracted by protein hydrolysate, especially immature females; but only mature females were attracted by the fresh guava. Ovary maturation began earlier and developed faster at higher environmental temperature. The ovary ceased to develop below 15℃, and the beginning of ovary maturation was 15 days at 20℃, 8 days at 25℃, 5 days at 28℃and 3 days at 30℃. Newly emerged females would not proceed ovary development without protein source. After protein was provided, the speed of egg formation was not different between the test group and control group with constant protein supply after emergence.