Ahmed, A., Radi, A., Tolba, E. (2019). Efficiency of Phenolic Contents and some Field Factors on the Population Abundance of Aphid Species and Onion Thrips Infesting Bread Wheat Cultivars under Irrigation Conditions. Journal of Plant Protection and Pathology, 10(1), 69-75. doi: 10.21608/jppp.2019.40590
A. M. M. Ahmed; Abeer A. Radi; Eman F. M. Tolba. "Efficiency of Phenolic Contents and some Field Factors on the Population Abundance of Aphid Species and Onion Thrips Infesting Bread Wheat Cultivars under Irrigation Conditions". Journal of Plant Protection and Pathology, 10, 1, 2019, 69-75. doi: 10.21608/jppp.2019.40590
Ahmed, A., Radi, A., Tolba, E. (2019). 'Efficiency of Phenolic Contents and some Field Factors on the Population Abundance of Aphid Species and Onion Thrips Infesting Bread Wheat Cultivars under Irrigation Conditions', Journal of Plant Protection and Pathology, 10(1), pp. 69-75. doi: 10.21608/jppp.2019.40590
Ahmed, A., Radi, A., Tolba, E. Efficiency of Phenolic Contents and some Field Factors on the Population Abundance of Aphid Species and Onion Thrips Infesting Bread Wheat Cultivars under Irrigation Conditions. Journal of Plant Protection and Pathology, 2019; 10(1): 69-75. doi: 10.21608/jppp.2019.40590
Efficiency of Phenolic Contents and some Field Factors on the Population Abundance of Aphid Species and Onion Thrips Infesting Bread Wheat Cultivars under Irrigation Conditions
1Department of Plant Protection, Faculty of Agriculture, Assiut University (71526), Assiut, Egypt
2Department of Botany, Faculty of Science, Assiut University (71526), Assiut, Egypt
3Plant Prot. Dept., Faculty of Agric, New valley University, New valley, Egypt.
Abstract
The study was conducted during (2015/ 2016 and 2016/ 2017) at the farm of Plant Protection Department, Faculty of Agriculture, Assiut University, Assiut, Egypt on five wheat cultivars: Sahel 1, Seds 4, Gemaza 9, Giza 168, and Misr 2). To study the effects of phenolic contents (free and bound phenols), climatic factors (daily maximum (DMxT) and minimum temperatures (°C) (DMnT), soil maximum and minimum temperatures (°C) (SMxT and SMnT) at 5 cm depth, and the natural enemies (N. E.) on the population density of onion thrips, Thrips tabaci Lindeman and aphid species (Mayzus persicae Sulz., Brivecoryne brassicae Linnaeus, and Rhopalosiphum padi Linnaeus) infesting bread wheat cultivars under irrigation conditions, with references to the yields of wheat cultivars. The invasions started in February during the 1st season and in January for the 2nd season on all of wheat cultivars. The invasions of thrips individuals were higher than aphids in almost of wheat cultivars during the two seasons of the study. In the 1st season, aphid’s populations showed three peaks on all cultivars in the 31th of March, 15th of April, and in the 30th of April. Meanwhile, thrips individuals registered two peaks: the 1st peak was in the 15th of March and the second were occurred in the 31th of March. Respect to the 2nd season, aphids recorded three peaks in 15th, 28th of February and 15th of March on all wheat cultivars and thrips recorded two peaks of fluctuations in the 28th and 15th of March. All of the considered factors were contributed together in forming the patterns of the population density (R2) by 53.62, 60.44, and 71.65%; respectively for aphids, thrips and the grand total of pests during the two seasons of the study. In case of Aphids, (DMnT) was the highest participated factor in regulating the population (16.906 out of 53.62%), the free phenol contents showed that the only negative correlation and ranked the second efficient factor by (16.62 out of 53.62%), afterwards the third efficient factor was (DMxT) which shared with (11.073 out of 53.62%), and finally the natural enemies showed the least efficient factor by (0.026 out of 53.62%) on all wheat cultivars. The population for both thrips and grand total were mostly under controlled by the same factors,(DMnT) was the highest efficient factor (18.614 out of 60.48% and 24.525 out of 71.65%; respectively for thrips and the grand total of pests). Then, (N. E.) played the second role with (13.337 out of 60.44%) for thrips and (15.032 out of 71.65%) for the grand total. Afterwards, (DMnT) ranked the third factor (12.794 out of 60.44% and 14.800 out of 71.65%; respectively for thrips and the grand total of pests). The least efficient factor for thrips was (SMxT) which participated by (0.240 out of 60.44%) and for the grand total of pests were bound phenol contents (0.129 out of 71.65%). Top yields were gained from Giza 186 and Misr 2 (218.0, 213.4 and 207.3, 198.8 GY/10 plants; respectively during the 1st and 2nd seasons. Afterwards, Gemeza 9 ranked the third cultivar in the 1st season (182.7 GY/10 plants) and Sahel 1 for the 2nd season (192.8 GY/10 plants)
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