بررسي زيست شناسي مگس SPHAEROPHORIA SCRIPTA )DIP: SYRPHIDAE(

Biology of Sphaerophoria scripta (Dip.: Syrphidae) in Laboratory Conditions

Biology of Sphaerophoria scripta (Linnaeus) was studied in the following laboratory conditions: 22+2 °C, 70-75% R.H and 14:10 L. D. The adults were collected from Rostam Abad of Guilan province and transferred to laboratory.The oviposition mean for each female was 195.2+56.08 eggs in cage (60x60x 100 cm). The maximum oviposition was in 4th and 5th days. The mean duration of development time (egg to adult) of S. scripta were 16.25+1.06 days while fed on Aphis craccivora in petri dishes (6 x 1.5 cm). The mean longevity of adult males and females were 3.5+0.53 and 3.6+0.51 days without feeding, 9.8 + 1.6 and 10.2 ± 1.16 days feeding on rape seed flower, 14.62 ± 1.06 and 14.87 + 1.12 feeding on suger solution with water (4:1), respectively. The maximum longevity was related to those fed on suger solution with water. Nutritional diet had no effects on male and female. Feeding capacity increased with age of larvae and mean total larval feeding was 284 ± 21.69 aphids.