ECOLOGICAL STUDIES ON THE IMMATURE STAGES OF THE COTTON LEAFWORM SPODOPTERA LITTARALIS (BOISD.) IN SHARKIA GOVERNORATE

EL-ZOHAIRY, MANSOUR M.; METWALLY, EL-SAYED M.; NASR, EL-SAYED A.; EL-SEBAY, YOUSRY; RADWAN, SAMER M. E.; DESUKY, WAHED M. H.

doi:10.21608/ejar.1994.454526

ECOLOGICAL STUDIES ON THE IMMATURE STAGES OF THE COTTON LEAFWORM SPODOPTERA LITTARALIS (BOISD.) IN SHARKIA GOVERNORATE

Document Type : Original Article

Authors

¹ Plant Protection Department, Faculty of Agriculture, Zagazig University, Egypt

² Plant Protection Research Institute, Agricultural, Research Centre, Dokki, Giza, Egypt

10.21608/ejar.1994.454526

Abstract

The present work was carried out to study the population density of the imature stages of the cotton leafworm Spodoptera littoralis Boisd. in Berseem fields . Samples of egg-masses taken from 15 locations over 4 years had shown that the pest had 3 generations. The first started in the third week of May, the second in the third week of June and the third in the first week of August. The second generation was the largest as indicated by the number of egg-masses collected. The second generation came next followed by the first. No significant differences were found between the immature stages collected from the several localities. The least number of immatures occurred during March, and the highest during May.