Activity of Two Photosensitizer Compounds for Sustainable Control of the Egyptian Cotton Leafworm, Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae)

Activity of two photosensitizer compounds were studied on different stages of Spodoptera littoralis under laboratoryconditions. Copper chlorophylline and magnesium chlorophylline as a photosensitizer compounds with differentconcentrations were tested on S. littoralis immature stages, egg, larvae and pupae. Data showed that copper chlorophyllinehas a slight effect while magnesium chlorophylline has no effect on egg stage of S. littoralis. The copper chlorophyllinewas more toxic on 2nd and 4th instar larvae than magnesium chlorophylline under both dark and photo conditions.Therefore, both compounds were more toxic under sunlight than dark conditions when pupae were immersed at differentconcentrations of the both photosensitizers’ compounds. These results reflected that photosensitizers could be a potentiallyeffective for S. littoralis control in Egypt.