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Assessment of quality control parameters during mass rearing of a pupal colour genetic sexing strain of the Mediterranean fruit fly

Quality control charts were employed to monitor the quality of several parameters during mass rearing of the T: Y(WP +)30C strain of Ceratitis capitata (Wiedemann), in which male and female flies emerge from brown and white puparia, respectively. Egg hatch and pupal recovery in this genetic sexing strain were below that reported for a wild‐type ‘Sohag’ strain, whereas pupal size, adult emergence and flight ability were higher. The overall recovery from eggs to adult flies capable of flight was similar in the two strains but egg production in T: Y(wp +)30C was reduced to about 56% of that of ‘Sohag’. The quality control charts showed an acceptable level of variation within sets of data but the level between data sets was occasionally out of control. This indicated the presence of uncontrolled conditions during the rearing process, possibly arising from variations in the quality of the larval diet. It is concluded that the quality of T: Y(wp +)30C renders this strain suitable for mass rearing in sterile insect technique (SIT) programmes requiring the elimination of the female flies prior to the release of sterilized males. The next step should involve further quality assessments both under field cage and under field release conditions. The importance of optimal and standardized dietary conditions is stressed in relation to the quality of mass reared medflies.