NASSEF, M., EL-FESHAWI, A., ABO-SHOLOA, M., WATSON, W. (1996). SEASONAL ABUNDANCE OF CERTAIN PREDATORS AS INFLUENCED BY COTTON PLANTING DATES AND WEATHER FACTORS. Egyptian Journal of Agricultural Research, 74(3), 585-597. doi: 10.21608/ejar.1996.428721
MOHAMED A. NASSEF; ADEL A. EL-FESHAWI; MOHAMED K. A. ABO-SHOLOA; WATSON M. WATSON. "SEASONAL ABUNDANCE OF CERTAIN PREDATORS AS INFLUENCED BY COTTON PLANTING DATES AND WEATHER FACTORS". Egyptian Journal of Agricultural Research, 74, 3, 1996, 585-597. doi: 10.21608/ejar.1996.428721
NASSEF, M., EL-FESHAWI, A., ABO-SHOLOA, M., WATSON, W. (1996). 'SEASONAL ABUNDANCE OF CERTAIN PREDATORS AS INFLUENCED BY COTTON PLANTING DATES AND WEATHER FACTORS', Egyptian Journal of Agricultural Research, 74(3), pp. 585-597. doi: 10.21608/ejar.1996.428721
NASSEF, M., EL-FESHAWI, A., ABO-SHOLOA, M., WATSON, W. SEASONAL ABUNDANCE OF CERTAIN PREDATORS AS INFLUENCED BY COTTON PLANTING DATES AND WEATHER FACTORS. Egyptian Journal of Agricultural Research, 1996; 74(3): 585-597. doi: 10.21608/ejar.1996.428721
SEASONAL ABUNDANCE OF CERTAIN PREDATORS AS INFLUENCED BY COTTON PLANTING DATES AND WEATHER FACTORS
1Sakha Agricultural Research Station, Kafr El-Sheikh, Egypt
2Faculty of Agriculture, Zagazig University, Egypt
Abstract
The present study was carried out at Sakha Agric. Res. Station to evaluate the effect of four cotton planting dates (March 16, April 2, April 16 & May 1 during 1990 and March 11, March 26, April 8 & April 22 during 1991 season), on the population density of certain predators as well as the effect of three prevailing weather factors (temperature, relative humidity and wind speed) on the population changes of such predators. Results obtained could be summarized in the following points : - Three peaks of abundance were observed for C.undecimpunctata, Ch.carnea, Scymnus spp and Onus spp. during the period of study from May to October. -P.alfierii was the dominant predator and its population occurred throughout the whole period of cotton season recording two peaks of abundance during July and August. -The seasonal abundance of true spiders showed two peaks during June and July. -The total population of predators fluctuated and recorded three peaks of abundance during June, July & August (1990) and July, August & September (1991 season). - The population of C.undecimpunctata (1990 season), Ch.carnea, P.alfierii, Scyrnnus spp., true spiders (1991 season) were insignificantly affected by planting dateS. Meanwhile, the population density of C.undecimpunctata (1991 season) and Onus spp. were affected significantly by sowing dates. - Temperature and wind speed were the main weather factors affecting the population changes of C.undecimpunctata, Ch.carnea ,Orius spp. and Scymnus spp. Meanwhile, temperature and relative humidity played an important role in the population changes of true spiders. Also, temperature factor was positively highly significant on the population changes of P.alfierii and the total population of predators.
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