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Title of Thesis: USES OF SOME ENVIRONMENTALLY SAFETY TREATMENTS TO CONTROL NET BLOTCH DISEASE IN BARLEY TO IMPROVE IT’S TECHNOLOGICAL QUALITY
Net blotch caused by Pyrenophora teres is one of the most destructive foliar diseases of barley (Hordeum vulgare) in Egypt . In this study two experiments were conducted in strip-plot block design during 2012/ 13 growing season at two locations ; Itay El-Baroud and Sakha stations Behaira and Kafr Elsheikh Governorates , Egypt .
Barley adult plants of two rowed hulled Giza 127, Giza 128 and six rowed hulls Giza 129,Giza130 were grown under open field conditions at growing season were sprayed Epoxiconazole (Opus ( in different growth stages .The objective of this experiment was to study net blotch epidemiology and management and to suggest the future net blotch control strategy. Disease epidemic was significantly influenced by leaf positions, being high in the lower leaves and low in the upper leaves. Net blotch severity was associated negatively with grain yield and 1000-kernel weight . In the present study Epoxiconazole (Opus ( foliar applications at GS30&39 provided greater TKW and grain yield total protein , total lipids ,total fiber , crude ash and total carbohydrates . over non-fungicide treatment.
The antifungal activity of resistance inducers ; Mono potassium phosphate ( KH2PO4) , Chitosan clay Nano composite (CCNC), Humic acid (HA) , Sodium meta silicate) Si( were tested in controlling Pyrenophora tere Ana morph : Drechslera teres the causal organism of net blotch of barley . The evaluation was carried out at barley adult plant stages using two rowed hulled Giza 127, Giza 128 and six rowed hulls Giza 129 Giza and 130 under green house and open field conditions at two locations ; Etay El-Baroud and Sakha stations Behaira and Kafr Elsheikh Governorates , in 2013/ 2014 growing season in Egypt. All concentrations of the four tested inducers were significantly and negatively correlated with each of the biochemical traits . The highest correlation was observed between disease severity (DS) and 1,3- glucanase after 15 days . Spraying barley plants of the two studied cultivars with the tested inducers showed significantly correlation between disease severity and each of one thousand kernel weight (TKW) , plot weight , total protein , total lipids , total fiber , crude ash and total carbohydrates .
The highest increase was detected when plants were sprayed with KH2PO4 followed by Chitosan clay Nano composite (CCNC), Humic acid (HA) and Sodium meta silicate )Si(
It is worth mentioning that decreased disease severity resulted significant increase in 1000 kernel weight (g) compared to the control.
After harvesting, barley cultivars were used in this experiment to determine total protein , total lipids , total fiber , crude ash and total carbohydrates .
On the other hand, biological assay revealed that Giza 130 highly significant decreased LDL and triglyceride .
On the other hand the effect of barley flour on consumer preference on crepes was evaluated and Giza 130 was more consumer acceptable .
key words : barley (Hordeum vulgare) , Drechslera teres, AUDP, antifungal activity, biological control , inducers , net blotch, Mono potassium phosphate (KH2PO4 ) , Chitosan clay Nano composite (ccnc) , Humic acid (HA) , Si