Pupae of the Mediterranean fruit fly, Ceratitis capitata Wied., 2–3 days before emergence were irradiated with doses of 1000, 2000, 3000, 4000, 6000 and 8000 r. At intervals of 1, 2, 4, 6 and 8 days after emergence, 10 males were collected, dissected and testes were mounted. Measurements of the maximum length and width of the testes were carried out at those intervals.
At the lower tested doses (1000 and 2000 r), irradiated males showed some morphological aberrations which were clearly noticed in the reduction of the size of the testes on 8th day. This reduction was clearly detected on 6th day in 3000 and 4000 r‐irradiated testes. Greater response of the testes to irradiation was clearly observed at 6000 and 8000 r, as indicated by a noticeable decrease in their size beginning from the 4th day and reaching its maximum reduction at 8000 r on the 8th day when the testes were about 2/3 the size of the corresponding controls.
Zusammenfassung
Anatomische Wirkungen von γ‐Bestrahlung auf die männlichen Reproduktionsorgane der Mittelmeerfruchtfliege Ceratitis capitata Wied.
Puppen von C. cipitata wurden 2–3 Tage vor dem Schlüpfen mit γ‐Strahlen in Dosen von 1000, 2000, 3000, 4000, 6000 und 8000 rad bestrahlt und 1, 2, 4, 6 und 8 Tage später getötet und seziert. Insbesondere wurden die Testes auf ihre Länge und Breite hin untersucht. Bei geringerer Strahlendosis (1000 und 2000 rad) zeigten die Männchen 8 Tage nach der Bestrahlung eine Verringerung der Größe der Testes. Eine ähnliche Verkleinerung zeigte sich am 6. Tag, wenn mit 3000 und 4000 rad bestrahlt wurde. Stellenveränderungen der Testes traten nach Applikation von 6000 und 8000 rad auf. Sie erreichten ihr Maximum (Verkleinerung auf etwa 2/3 der Normalgröße) bei 8000 rad am 8. Tag nach Behandlung.
Pupae of the olive fruit fly, Dacus oleae (Gmelin) 1 to 2 days before adult emergence were irradiated with the suitable sterilizing dose of 80 Gy gamma rays. At intervals of 5, 10, 15, 20, 25 and 30 days after adult emergence, anatomical and biometrical studies were performed to determine the extent of recovery of D. oleae gonads during one month of adult life. There were some indications of gonad recovery after two weeks. This recovery was observed as a decrease in the percentage deviation from the corresponding controls of 20-day-old adult gonad (especially those of males). Generally, female gonads are more sensitive to gamma-rays than those of males.
The relative activity of three concentrations of Spodoptera Uttoralis nuclear polyhedrosis virus (SLNPV) against Ceratitis capitata were determined by (a) submerging two egg age groups, freshly laid eggs (0-2.5 hr) and more older ones (0-24 hr) in viral concentrations, and (b) feeding newly hatched larvae on viral contaminated media. Pupations that resulted from all viral treatments were decreased with increase of virus dose. Hatchability showed the same relation, but hatchability of treated old eggs were not significantly influenced by increases in viral concentration. Adult emergence was significantly reduced due to viral treatments to eggs, however, it was increased in the case of feeding the larvae on contaminated diet. The most hypothetical probability of this deleterious effect may be attributed to an activation of an indigenous virus already present in C. capitata. More research is required to understand the basis for the deleterious effect of SLNPV on the fruit fly.Resume-L'activite relative de trois concentrations de la polyedrose nucleaire de Spodoptera Uttoralis (SLNPV) contre in mouche de fruits Ceratitis capitata a ete determine. Les essais ont ete effectues par la contamination des coplaques successivement pondues (0, 2.5 et 24 heures), et ralimentation des larves neonates sur milieu contamine par la suspension virale. La pupaison, pour tous les traitements viraux, diminue avec l'augmentation des doses virales. Le taux d'eclosion des oeufs montre la meme relation mais si le traitement est effectue sur des vieux oeufs il n'y a pas d'influence significative selon les augmentations des doses virales. La sortie des adultes est reduite d'une facon significative par le traitement des oeufs, mais surtout dans le cas ou les larves sont nourries sur du milieu contamine. II est suggere comme hypothese que l'effet deletere est attribue a une activation d'un virus deja present dans Ceratitis capitata. D'autres recherches sont necessaires pour comprendre l'effet deletere de SLNPV sur la mouche des fruits.
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