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Effect of Light on the Development of the Angoumois Grain Moth, Sitotroga Cerealella Olivier (Lepidoptera: Gelechiidae)

  • I. I. Ismail (a1), A. K. M. El-Nahal (a1), A. H. Kamel (a2) and T. S. Mostafa (a2)

Abstract

The effect of light on the development of the angoumois grain moth, Sitotroga cerealella, was studied. Three different light conditions, i.e. continuous light (LL), continuous darkness (DD) and antural illumination (LD), were used.

Eggs bred under LL system showed the shortest mean incubation period, 3.27 and 4.66 days after one and four generations, respectively. The light had no effect on egg hatchability. The number of larvae that reached the adult stage under LL was less (33–36%) than under LD (37–40%) or DD (38%). The fertile females begin egg laying within 0.9 to 2.3 days after mating under all light systems. The shortest period (0.9) was shown under continuous light. The least oviposition period 4.4 and 4.5 was obtained under LL, while the longest period (6.4 and 5.7 days) was obtained under LD, after one and four generations, respectively. The light has no effect on the post-oviposition period. The longest life span of adults was recorded under LD and the shortest under LL. The females bred under LL, laid the least number of eggs (85–87 eggs), while those bred under LD and DD laid the highest number (128–130 for LD and 113–146 for DD, respectively).

L'effet du lumière sur le developpement de S. cerealella a été etudie. Trois systèmes des conditions de lumière ont été experimenté: Lumière continue (LL), obscurité totale (DD) et lumière naturèlle (LD).

Les oeufs conservés sous système LL ont montre la periode d'incubation la plus courte, 3.27 jours apres une génération et 4.66 jours après 4 générations. Le lumière n'a pas eu d'effet sur l'eclosion. Le pourcentage des larves arrivées au stade adulte est inferieur sous système LL que sous système LD ou DD, 33–36, 37–40 et 38 respéctivement. La mise d'oeufs par des femèlles fertiles est effectuée apartir de 0.9 a 2.3 jours après L'accouplement sous toutes les conditions de lumières. La période de la mise d'oeufs la plus courte (4.4 et 4.5) jours est obtenue sous système LL, par contre, la période la plus longue (4.6 et 5.7 jours) est obtenue sous système LD. Le lumière n'a pas eu d'effet sur la durée après la mise d'oeufs. La durée de vie la plus longue de l'adulte a été obtenue sous système LD et la plus courte sous LL. La femelle élevée sous système LL a produit le plus petit nombre d'oeufs (85–87), tandis que celles élevées sous systèmes LD et DD ont produit le nombre le plus grand (128–130 pour LD et 113–146 pour DD).

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References

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Effect of Light on the Development of the Angoumois Grain Moth, Sitotroga Cerealella Olivier (Lepidoptera: Gelechiidae)

  • I. I. Ismail (a1), A. K. M. El-Nahal (a1), A. H. Kamel (a2) and T. S. Mostafa (a2)

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