Flight range of the moth of the cotton leaf worm Spodoptera littoralis (Bois.).
About 3000 dye-marked laboratory-reared adults of Spodoptera littoralis (Boisd.) were released in fields of cotton and groundnut near Cairo, Egypt, on four dates in the period June-August 1971. Releases were made at dusk, and illuminated white screens were used to collect moths during a period of 4 h in the ensuing night at various points in the area. The total numbers of marked moths recaptured at distances of 250, 500, 1000 and 1500 m were 21, 28, 7 and 2, respectively. These results are discussed in relation to the need for the moths to obtain nectar if normal egg-production is to take place.