抄録
In order to establish measures to control houseflies (Musca domestica L.) which break out from organic fertilizers applied in horticulture, a series of basic studies on their physiology and/or ecology was carried out. From these studies, it was found that their reactions to chemicals were different depending on the developmental stage. One finding was that, while eggs were deposited preferably, the growths of the larvae were inhibited in each media containing sucrose. Furthermore, sucrose caused repellent reaction to the larvae at early to middle stage and exhibited a tendency of lethal action to the larvae at the middle to prepupal stage. Based on these results, the effects of sucrose on the larvae of houseflies were further investigated. The results indicated that the larvae at the middle stage which were contact-treated with 2 M sucrose for 2 hours suffered 96.0±5.2% mortality before pupation. While 93.8% of the tested population died between 24 and 60 hours after treatment, the timing was almost coincident with that of normal pupation for the untreated population. On the other hand, when the applied sucrose was washed off from the body surface immediately after the contact treatment, the larvae grew normally as untreated larvae did. The observed growth-inhibitory effects of sucrose were considered to be due to its contact with the body surface of the larvae. It was also considered that sucrose might influence the physiological activities of pupation induced by internal materials such as molting hormone at their prepupal stage.
