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Root rot caused by soil borne pathogenic fungi is the most sever disease attacks lupine plants. Isolation trials from diseased plants in some areas of Dakahlia Province (Egypt) was carried out. Rhizoctonia solani and Fusarium solani proved to be the most dominant isolates. Meanwhile, Fusarium oxysporum and Sclerotium rolfsii were less frequent. Efficacies of some plant resistance elicitors viz.: chitosan (CHI), Salicylic Acid (SA) and hydroquinone (HQ) in comparing to the fungicide Rhizolex T-50 as seed treatments showed significant reduction in the fungal growth in vitro. Chitosan at 8 g L(-1) and fungicide completely inhibited the growth of all isolated fungi, while SA at 1.4 g L(-1) and HQ at 1.2 g L(-1) inhibited the growth of Fusarium solani and F. oxysporum, respectively. The greenhouse experiments showed that S. rolfesii (No. 6) and R. solani (No. 2) followed by F. solani (No. 5) and F. oxysporum (No. 9) were the most aggressive root rot fungi. Soaking susceptible lupine seeds (Giza 1) in each one of the three selected elicitors showed a significant reduction in seedlings mortality. CHI at 8 g L(-1) was superior in increasing the percentage of healthy plants to record 72.5, 80.9, 62.7and 64.3%, when seeds were grown in soil infested with of F. solani, F. oxysporum, R. solani and S. rolfesii, respectively. These results were confirmed under field conditions in two different locations i.e., Tag El-Ezz and El-Serow Research Stations. CHI 8 g L(-1) proved to be the best elicitor after fungicide, in reducing lupine root rot disease. It showed 41 and 60% reduction in the plants mortality comparing to 56.37 and 69.13% in case of Rhizolex-T in Tag El-Ezz and El-Serow locations, respectively. The treatments were accompanied with a significant increase in lupine growth parameters, yield components and physiological aspects. Application of CHI at 8 g L(-1) or HQ at 1.2 g L(-1) was the most potent in this respect as compared to check treatment.

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Our present study was designed to investigate the role of both Trichoderma harzianum and chamomile (Matricaria chamomilla L.) flower extract in mutual reaction against growth of Pythium ultimum. In vitro, the activity of chamomile extract was found to reduce the radial growth of Pythium ultimum up to 30% compared to the control. Whereas, the radial growth reduction effect of T. harzianum against P. ultimum reached 81.6% after 120 h. Data also showed the productivity of total phenolics and total flavonoids by T. harzianum, was 12.18 and 6.33 mg QE/100 mL culture filtrate, respectively. However, these compounds were determined in chamomile flower extract at concentrations of 75.33 and 24.29 mg QE/100 mL, respectively. The fractionation of aqueous extract of chamomile flower using HPLC provided several polyphenolic compounds such as pyrogallol, myricetin, rosemarinic acid, catechol, p-coumaric acid, benzoic acid, chlorogenic acid and other minor compounds. In vivo, the potentiality of T. harzianum with chamomile flower extract against Pythium pathogen of bean was investigated. Data obtained showed a reduction in the percentage of rotted seed and infected seedling up to 28 and 8%, respectively. Whereas, the survival increased up to 64% compared to other ones. There was also a significant promotion in growth features, total chlorophyll, carotenoids, total polyphenols and flavonoids, polyphenol-oxidase and peroxidase enzymes compared to other ones. To the best of our knowledge, there are no reported studies that included the mutual association of fungus, T. harzianum with the extract taken from the chamomile flower against P. ultimum, either in vitro or in vivo. In conclusion, the application of both T. harzianum and/or M. chamomilla extracts in the control of bean Pythium pathogen showed significant results.

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Damping-off and root rot diseases caused by several soil-borne pathogenic fungi are the most responsible for high reduction in lentil yield. The aim of the present study is to evaluate the efficiency of kinetin and Trichoderma for controlling these diseases and lentil productivity compared with Rizolex-T50 fungicide. Rhizoctonia solani and Fusarium oxysporum are the common causal pathogens which isolated from infected lentil collected from different fields of Dakahlia Governorate, Egypt. In greenhouse: both tested fungi were pathogenic and caused pre-and post-emergence damping-off. Lentil cultivar Giza 9 was more susceptible for infected with both pathogenic fungi. F. oxysporum was most aggressive in post-emergence damping-off. On the other side, Rizolex-T50 recorded the highest reduction in emergence damping-off in both lentil cultivars, Trichoderma harzianum come next. Anatomically, R. solani caused complete disruption of the epidermal and cortical cells in both cultivars of lentil roots, Giza 9 was very affective. In field: Lentil; Giza 4 cultivar was more tolerant for infected with dampingoff and root rot diseases under natural infection. The application of both Trichoderma species and two concentrate of kinetin led to significant reduction in damping-off and dead plants. T. harzianum was more effective. Giza 4 was the best cultivar in photosynthetic pigments as compared with Giza 9. Except Rizolex-T50, all treatments increased significantly photosynthetic pigments. Kinetin at 100 ppm was more effective. Meanwhile, T. harzianum gave the highest values of total phenols content. Kinetin at level 100 ppm gave the highest average of growth parameters (plant height and branches number plant-1)and yield components (pods number plant-1 , 1000 seed weight and seed yield (kg/fed)). Giza 4 cultivar recorded the highest yield, while Giza 9 was the best in seed quality. The highest seed protein% occurred under the application of T. viride. Meanwhile, kinetin at 100 ppm gave the high phosphorus percentage in the seed of lentil. Therefore, application of kinetin at 100 ppm as well as T. harzianum as seed soaking could be recommended for controlling soil-borne diseases in addition to improving growth and productivity of lentil.