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Abstract Hassan Ahmed Hassan: Impact of Climate Changes on some Pests and Diseases Infesting Faba bean Plant under Egyptian Conditions. Unpublished MSc. Thesis, Department of Plant Protection, Faculty of Agriculture, Ain Shams University, 2016. Faba bean (Vicia faba L.) is one of the most important legume crops cultivated in Egypt. Which are liable to attack by many insects and foliar diseases cause severe losses in yield and quality in the crop under Egyptian conditions. The present study was carried throughout two successive seasons 2011/2012 & 2012/2013 at three governorates (Bani sweif - Behira - Gharbia). Two insect pests; aphids (Aphis Craccivora Koch), leafminer (liriomyza trifolii) species, two natural enemies (predator); green lacewing (Chrysopa vulgaris) and Ladybird (Coccinella septempunctata L.) and four foliar diseases; Brown spot disease, Rust diseases, Bean Yellow Moscia virus and Leaf Curl Virus were recorded. The population dynamics of key pests infesting and natural enemies of faba bean showed that, the seasonal abundance of the insects and natural enemies were higher during 2012/2013 than 2011/2012. The population of aphids was increased gradually to reach its peak on February at Beni sweif and Behria governorates and reach its peak on March at Gharbia governorate . The population of leaf miner was increased gradually to reach its peak on March at Beni sweif, Behria and Gharbia governorates . The population of predators were increased gradually to reach its peak on February at Beni sweif, Behria and Gharbia governorates. The highest value of aphids and leaf miner was recorded in Beni sweif governorate and lowest values were observed in Gharbia governorates. The highest prevalence value of Brown spot disease and Rust diseases was recorded in Behira governorate and The minimum prevalence was recorded in Beni sweif. The highest prevalence value of Bean Yellow Mosaic virus and Leaf Roll Virus was recorded in Beni sweif and The minimum prevalence was recorded in Gharbia governorates. The seasonal fluctuation of the investigated insects, associated natural enemies and severity of foliar diseases in relation to certain 10 days mean of the weather factors (Maximum temperature, Minimum temperature, Mean relative humidity (R.H %) and Mean wind speed in addition to age of plant, were tested to clarify their simulation effects on population of insects, associated natural enemies and severity of foliar diseases infesting faba bean during two successive seasons 2011/2012 & 202/2013 at Behira, Gharbia and Beni sweif governorate. the seasonal fluctuation of the Aphids in relation to certain two biotic factors chrysopa vulgaris and Coccinella septempunctata L., the results showed had highly significant positive on the seasonal fluctuations of aphids infesting faba bean during two successive seasons 2011/2012 & 2012/2013, under the study areas. Influence of climate change on severity of insects and foliar diseases infesting faba bean during growing seasons from 2000 to 2011, the highest value of prevalence of insect and diseases of recorded the aphids and rust diseases at Bani sweif governorate and aphids and brown spot disease at Behira and Gharbia governorate. Forecasting of severity of diseases and degree-days units days number per generate and generations number of insect faba bean during growing seasons 2050s and 2100s compared with 2013s season in tested governorates there was considerable differences of severity of brown spot during growing seasons 2050s and 2100s compared with 2013s and no considerable differences severity of rust disease and virus diseases during growing seasons 2050s and 2100s compared with 2013s.there was considerable differences of degree-days units days number per generate and generations number of insect faba bean during growing seasons 2050s and 2100s compared with 2012s an2013s season in tested governorate. Key words: Vicia faba L., Faba bean, Liriomyza trifolii, Aphis carccivora, predator, Coccinella septempunctata L., Chrysopa vulgaris, Foliar diseases, Brown spot disease, Rust diseases, Bean Yellow Moscia virus. Leaf Roll Virus, Weather factors, Climate change, Forecasting, Degree day unit. |