Record of the beet fly pegomyiah yoscyami (diptera: anthomyidae)‎ and relation with its larval – pupal parasitoid opius nitidulator (hymenoptera: braconidae)‎ in Kafr EL-Sheikh governorate

الملخص EN

All previous researches since 1981 (where sugar beet cultivation began in Egypt) till now - mentioned that the beet fly is Pegomyia mixta Vill.

(Diptera: Anthomyidae) infested sugar beet fields at Kafr El-Sheikh Governorate.

But, this work demonstrates that there is another sibling species of beet fly Pegomyia hyoscyami (Panzer) (Diptera: Anthomyidae).

It was reared on sugar beet plants.

The current study was carried out at Al-Nataf Village, Kafr El-Sheikh Governorate during two successive seasons 2017 / 2018 and 2018/ 2019 to assessment the role of the parasitoid; Opius nitidulator Nees (Hymenoptera: Braconidae) attacking larval stage of P.

hyoscyami by collected 15 blotches (one blotch contain 2 to 5 larvae ) per sample/ month and the correlation coefficient values between P.

hyoscyami populations and its larval – pupal parasitoid O.

nitidulator was carried out.The obtained data showed that the individuals of P.

hyoscyami form 98.25% and 98.08% out of the total number of flies in both seasons, respectively.

Whereas, the larval-pupal parasitoid, O.

nitidulator constitute 100 and 100% out of the total populations in the two seasons.

Statistical analysis indicated that a highly positive significant correlation between P.

hyoscyami and its parasitoid.

Values of "r" were 0.993 and 0.937 in both seasons, respectively.