SIMULTANEOUS EFFECT OF FOUR WEATHER FAC- TORS ON THE FIELD INFESTATION OF THE COTTON LEAFWORM SPODOPTERA LITTORAL'S (BOISD.) IN SIX SUCCESSIVE YEARS. | ||
| Egyptian Journal of Agricultural Research | ||
| Article 8, Volume 72, Issue 1, March 1994, Pages 813-89 PDF (1.79 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejar.1994.444803 | ||
| Author | ||
| SAWSAN M. ABDEL-HALIM | ||
| Plant Protection Research Institute, Agricultural Research Centre, Dokki, Giza, Egypt. | ||
| Abstract | ||
| Infestation percentage of the cotton leafworm Spodoptera firtoralis (Boisd) was studied at beheira governorate during May and July for the six successive years 1984-1989. Infestation with the cotton leaf-worm increased gradually and reached its maximum at the beginning of July in all examined seasons. The climatic conditions prevailing in the same period were recorded. Statistical regression analysis was applied to determine significant correlations. When the four climatic factors; daily mean temperature, daily mean relative humidity, daily mean barometric pressure and daily mean net solar radiation were computed simultaneously, the results showed high significant correlation of infestation in May, June and July, (59%, 38% and 26%, respectively). In July however, the effect of the two factors; daily mean temperature and daily mean net solar radiation showed high significant reverse relation during the six successive years. The results confirm the importance of weather parameters as limiting factors for the infestation levels of the cotton leafworm under field conditions. Thus, climatic parameters can be used in setting mathematical modelling for the prediction of field infestation by the cotton leafworm. Such prediction is essential for the development of IPM strategies. | ||
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