Population ecology of green peach aphid, Myzus persicae (Sulzer) n radish and cabbage
| Autor: | Kuo, Mei-Hwa, 郭美華 |
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| Rok vydání: | 1994 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 83 Occurrence and emergence rate of alate of the green peach aphid, Myzus persicae (Sulzer), were influenced by temperature and initial apterous female density. Nutrition, high and low temperatures might suppress occurrence of alate individuals. The emergence rate of alate aphids was highest at 15℃.The population growth time was always shortest at high initial density of 16 aphids/leaf when tested with various temperatures. Usually the highest peak occurred at about 20 days after starting the population growth, however, peaks took longer time at low temperatures and reached earlier at high temperatures. The intraspecific competition was a scramble one. The protein content in the body of the green peach aphid was measured to be 4%∼8%, and raised with increase of temperature and declined with aphid age. The protein content was affected by temperature and population growth of aphid. The aphid population growth was hampered by high temperature at 30℃, the body weight of adult reduced to the lightest. Both M. persicae and the turnip aphid, Lipaphis erysimi (Kalt.), were found coexisted and clumped distribution in the fields. The peaks of population of both species appeared in November. Following the high population density, the field populations of aphids were heavily parasitized by parasitoids in December. The developmental time of immature stage of Aphidius gifuensis Ashmead decreased with rise of temperature. The rates of pupation and adult emergence were highest at 20℃. In field population, the emergence rate was 57∼65%. The female sex ratio was 77.2∼78.1%. The developmental duration of the immature stage of Pachyneuron aphidis (Bouche) required as long as 22.67 days at 15℃ and as shortest as 7.20 days at 30℃. The Tb of the hyperparasite was significantly higher than the parasitoid, whereas the parasitoid Tb value was higher than that of its host aphid. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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