Effect of weather conditions of temperature and relative humidity on infestation levels of Spodoptera littoralis Boisd., Pectinophora gossypxella and Earias insulana on okra and cotton plants

Document Type : Original Article

Author

Plant Protection Department. Fac. of Agric. Suez Canal Univ. , Egypt

10.21608/jpces.1993.460814

Abstract

These studies were. Conducted during two successive seasons 1991 & 1992 on cotton and okra plants. In 1991 season studies were concerned with the population activity of cotton bollworms only (P. qossypiella and E. insulana). The heaviest infestation was recorded on okra while gossypiella attacked okra and cotton with higher numbers than E. insulana through two successive years. The relationship between weekly counts of P. qossypiella and E. insulana in cotton bolls and okra pods and their influence by max. temperature (°c) was negative while relative humidity (max. & min.) gave positive correlation on both of cotton and okra. Positive correlations were existed between weekly counts of cotton leafworm S. littoral is and both of RH%& °c.
Journal of Pest Control and Environmental Sciences
Volume 5, Issue 2
December 1993
Pages 23-36

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