Analysis of Economic Losses for Sugar Apple (Annona Squnmosa L.) by Oriental Fruit Fly (Bactrocera dorsalis Hendel)

• Main Authors: Cho-Ying Lee, 李卓穎
• Other Authors: Rebecca H. W. Chung
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/09077867789145532761

碩士 === 國立屏東科技大學 === 熱帶農業暨國際合作研究所 === 93 === The Oriental fruit fly (Bactrocera dorsalis Hendel) is the most important insect pest of fruit production in Taiwan. The pest is not only affected the yield and quality of fruits but also caused the quarantine barrier for fruits exporting. Without adequate control, the infestation rate could reach about 10-30%, which cause to a loss of approximate 4 billion dollars per year. This study utilized a stochastic simultaneous equation system to estimate the effect of a change in the amount of pesticides and other productive inputs on pest populations and on the yields of fruit produced. According to previous studies, physiological factors and the environment of the host plants would determine insect populations and fruit yield of hosts simultaneously. Beside, the physical and climatic characteristics of the tree’s site, pesticide and fertilizer should be applied in the operation management. Cultivating operations in orchard could suppress the pest population in temporarily, but the number of flies would increase again in a short period. The regular routine works for orchard management include the application of pesticides in the orchards, such human control variables had no significant effect on the fly populations. The normal fly population density was always high in the forest, and it served as a suitable habitat for the adult flies to hide from the weather extremes and human interferences. Based on this study, would applied the 2 stage least square equation model to identify the inter-relationship between the changing of population of Oriental Fruits flies and the production of host fruit. The study showed that, there was a high correlation between the size of orchard and production yield. With the increasing of orchard capacity and raise bagging application would somewhat increased fruit yield. Moreover, when the planting orchard close to another orchard or abandoned orchards would indeed increase the infestation rate and then directly affected the fruit production. Hence, cleaning up the prematurely dropped fruits and abandoned orchards would effectively reduced the density of pest population and improve the pest management control system.