Abu-Irmaileh, B.E. and J.R. Qasem, 1986. Aqueous extract effects of Salvia syriaca L. in various lines of four crops. Dirasat, 13: 147-170.

Al-Abed, A.S., J.R. Qasem and H.A. Abu-Blan, 1993. Antifungal effect of some common wild plant species on certain plant pathogenic fungi. Dirasat, 20: 149-158.

Al-Jebury, I.S. and J.R. Qasem, 2001. Weed competition in marjoram (Origanum syriacum). Dirasat, 28: 184-193.

Biftu, K.N. and J.R. Qasem, 2007. Competition between cowpea and redroot pigweed in response to phosphorus and planting density under field conditions. J. Hortic. Sci. Biotechnol., 82: 893-899.
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Biftu, K.N.and J.R. Qasem, 2003. Root and shoot competition between cowpea (Vigna sinensis L.) and redroot pigweed (Amaranthus retroflexus L.) at different levels of phosphorus. Dirasat, 30: 338-348.
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Issa, N.N. and J.R. Qasem, 2008. Allelopathic activity of cauliflower (Brassica oleracea var. botrytis) on certain common weed species. Proceedings of 5th World Congress on Allelopathy, September 21-25, 2008, Saratoga Springs, New York, USA -.

Mustafa, T. and J.R. Qasem, 1984. Host range of the bean aphid, Aphis fabae Scopoli in Jordan (Homoptera, Aphididae). Entomol. Basiliensia, 9: 48-53.
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Mustafa, T. and J.R. Qasem, 1984. Host range of the bean aphid, Aphis fabae Scopoli in Jordan (Homoptera, Aphididae). Entomol. Basiliensia, 9: 48-53.
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Obaid, K.A. and J.R. Qasem, 2002. Inhibitory effects of Cardaria draba and Salvia syriaca extracts to certain vegetable crops. Dirasat, 29: 247-259.
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Obaid, K.A. and J.R. Qasem, 2005. Allelopathic activity of common weed species on vegetable crops grown in Jordan. Allelopathy J., 15: 221-236.
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Obaid, K.A. and J.R. Qasem, 2005. Phytotoxicity of some common weed species to certain vegetable crops grown in Jordan. Dirasat, 32: 10-20.

Qasem J.R. and C.L. Foy, 2007. Screening studies on the host range of branched broomrape (Orobanche ramosa). J. Hortic. Sci. Biotechnol., 82: 885-892.
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Qasem, J. R. and T.A. Hill, 1995. Growth, development and nutrient accumulation in groundsel (Senecio vulgaris L.) and fat-hen (Chenopodium album L.). Weed Res., 35: 187-196.
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Qasem, J.R. and A.A. Hassan, 2003. Herbicidal properties of some medicinal plants against Malva sylvestris and Portulaca oleracea. Dirasat, 30: 84-100.
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Qasem, J.R. and A.M. Tell, 1993. Response of some wheat cultivars to weeding and fertilizer treatments. Dirasat, 20: 63-74.
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Qasem, J.R. and B.E. Abu-Irmaileh, 1983. The competitive effect and chemical control of syrian sage (Salvia syriaca L.) in wheat. Dirasat, 10: 123-128.

Qasem, J.R. and B.E. Abu-Irmaileh, 1985. Allelopathic effect of Salvia syriaca L. (Syrian sage) in wheat. Weed Res., 25: 47-52.
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Qasem, J.R. and C.L. Foy, 2001. Weed Allelopathy, its Ecological Impact and Future Prospects. In: Allelopathy in Agroecosystem, Kohli, R.K. and H.P. Singh, (Eds.)., Haworth Press, USA, pp: 43-119..

Qasem, J.R. and C.L. Foy, 2001. Weed allelopathy, its ecological impact and future prospects. J. Crop Product., 4: 43-119.
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Qasem, J.R. and C.L. Foy, 2004. Host range of branched broomrape (Orobanche ramosa L.) among some cultivated and wild grown plant species. Proceeding of the 4th International Weed Science Congress, June 20-24 2004, Durban, South Africa, pp: 97-97.

Qasem, J.R. and C.L. Foy, 2006. Selective weed control in Syrian marjoram (Origanum syriacum L.) with oxadiazon and oxyfluorfen herbicides. Weed Technol., 20: 670-676.
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Qasem, J.R. and H.A. Aau-Blan, 1996. Fungicidal activity of some common weed extracts against different plant pathogenic fungi. J. Phytopathol., 144: 157-161.
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Qasem, J.R. and H.A. Abu-Blan, 1995. Antifungal activity of aqueous extracts from some common weed species. Ann. Applied Biol., 127: 215-219.

Qasem, J.R. and I.S. Al-Jebury, 2001. Weed control in marjoram (Origanum syriacum L.) under field conditions. Dirasat, 28: 194-207.

Qasem, J.R. and K.N. Biftu, 2010. Growth analysis and responses of cowpea [Vigna sinensis (L.) Savi Ex Hassk.] and Redroot Pigweed (Amaranthus retroflexus L.), grown in pure and mixed stands, to density and water stresses. Open Hortic. J., 3: 21-30.

Qasem, J.R. and M. Kasrawi, 1995. Variation of resistant to broomrape (Orobanche ramosa) in tomatoes. Euphytica, 81: 109-114.
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Qasem, J.R. and N.N. Issa, 2005. Allelopathic effects of squash (Cucurbita pepo, L. cv. Scarlette) on certain common weed species in Jordan. Proceedings of the Fourth Congress on Allelopathy, August 21-26, 2005, Charls Strurt University, Wagga Wagga, NSW, Austuralia, -.

Qasem, J.R. and N.N. Issa, 2008. Possible role of cucumber (Cucumis sativus l. cv. Iba) in management of certain common weed species. Dirasat, 35: 103-119.

Qasem, J.R. and S.K. Khattari, 1993. Competition on nutrients between weeds and their associated vegetable crops. Dirasat, 20: 18-32.
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Qasem, J.R. and T.A. Hill, 1986. On difficulties with allelopathy methodology. Weed Res., 29: 345-347.

Qasem, J.R. and T.A. Hill, 1989. Possible role of allelopathy in the competition between tomato, Senecio vulgaris L. and Chenopodium album L. Weed Res., 29: 349-356.
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Qasem, J.R. and T.A. Hill, 1993. A comparison of the competitive effects and nutrient accumulation of fat-hen and groundsel. J. Plant Nutrit., 16: 679-698.
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Qasem, J.R. and T.A. Hill, 1993. Effects of the form of nitrogen on the growth and nutrient uptake of tomato, groundsel and fat-hen. J. Hortic. Sci., 68: 161-170.
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Qasem, J.R. and T.A. Hill, 1993. Nutrient accumulation of tomato (Lycopersicon esculentum), fat-hen (Chenopodium album) and groundsel (Senecio vulgaris) in relation to root characteristics. Dirasat, 20: 195-207.
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Qasem, J.R. and T.A. Hill, 1994. Inter and Intraspecific competition of fat-hen and groundsel. Weed Res., 34: 109-118.
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Qasem, J.R. and T.A. Hill, 1995. The effect of pot volume and potassium levels on growth of tomato, fat-hen and groundsel. Dirasat, 22: 499-520.
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Qasem, J.R. and T.A. Hill, 2003. Competition effects of fat-hen (Chenopodium album L.) and groundsel (Senecio vulgaris L.) on cabbage and lettuce. Dirasat, 30: 178-185.
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Qasem, J.R. and T.A. Hill, 2003. Shoot/root competition of fat-hen (Chenopodium album) and groundsel (Senecio vulgaris) with tomato and cabbage. Dirasat, 30: 211-219.
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Qasem, J.R., 1987. Fat-hen (Chenopodium album L.) and groundsel (Senecio vulgaris L.) interference with certain vegetable crops, with special reference to nutrition. Ph.D. Thesis, University of London..

Qasem, J.R., 1990. Aqueous extract effect of nettle-leaved goosefoot (Chenopodium murale) on wheat and barley. Res. J. Aleppo Univ., 14: 37-53.

Qasem, J.R., 1991. Growth, development and nutrient uptake of tomato (Lycopersicon esculentum) and fat-hen (Chenopodium album). Proceedings of the 4th Arab Congress of Plant Protection, December 1-5, 1991, Cairo, Egypt. -.

Qasem, J.R., 1992. Allelopathy- A natural mechanism of the relationship between weeds and cultivated crops. Proceedings of the 1st Arab Symposium for Weed Control in Orchards and Vegetable Fields, October 11-13, 1992, Federation of the Arab Scientific Research Councils, Amman, Jordan. -.

Qasem, J.R., 1992. Herbs and medicinal plants as a possible sources of natural pesticides. Proceedings of the First Arab Congress on Medicinal Plants as Clinical Drugs Based on the Recent Scientific Methods, October 5-8, 1992, Damascus, Syria. -.

Qasem, J.R., 1992. Nutrient accumulation by weeds and their associated vegetable crops (II). Damascus Univ. J., 7: 33-54.

Qasem, J.R., 1992. Nutrient accumulation by weeds and their associated vegetable crops. J. Hortic. Sci., 67: 189-195.

Qasem, J.R., 1992. Pigweed (Amaranthus spp.) interference in transplanted tomato (Lycopersicon esculentum). J. Horti. Sci., 67: 421-427.
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Qasem, J.R., 1992. Suggested strategy for weed control. Proceedings of the 1st Arab Symposium for Weed Control in Orchards and Vegetable Fields, October 11-13, 1992, Federation of the Arab Scientific Research Councils, Amman, Jordan. -.

Qasem, J.R., 1992. Suggested strategy for weed control. Proceedings of the 1st Arab Symposium for Weed Control in Orchards and Vegetable Fields, October 11-13, 1992, Federation of the Arab Scientific Research Councils, Amman, Jordan. -.

Qasem, J.R., 1993. Allelopathic effect of nettle leaved goosefoot (Chenopodium murale) on wheat and barley. Dirasat, 20: 80-94.

Qasem, J.R., 1993. Allelopathic effects of some arable land weeds on wheat. Pak. J. Weed Sci. Res., 5: 46-55.

Qasem, J.R., 1993. Aqueous extract effect of hoary pepperwort (Cardaria draba (L) Desv.) on wheat (Triticum durum L.) and barley (Hordeum vulgare L.). Mu'tah J. Res. Stud., 8: 63-79.
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Qasem, J.R., 1993. Methods of weed control in wheat crop. Proceedings of the 2nd Arab Symposium on Weed Control in Field Crops. October 18-20, 1993, Khartoum, Sudan. -.

Qasem, J.R., 1993. Plant Science. Al-Quds Open University Publications, Amman, Jordan, Pages: 860.

Qasem, J.R., 1993. Root growth, development and nutrient uptake of tomato (Lycopersicon esculentum) and Chenopodium album. Weed Res., 33: 35-42.
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Qasem, J.R., 1993. Weed control in wheat. Proceedings of the 2nd Arab Scientific Symposium on Weed Control in Field Crops, October 19-20, 1993, Khartoum, Sudan. -.

Qasem, J.R., 1994. Allelopathic effects of pigweed (Amaranthus spp.) on barley (Hordeum vulgare). Dirasat, 21: 101-120.

Qasem, J.R., 1994. Allelopathic effects of white top (Lepidium draba) on wheat and barley. Allelopathy J., 1: 29-40.

Qasem, J.R., 1994. Competition effect and nutrient accumulation of cabbage (Brassica oleracea var. Capitata) and fat-hen (Chenopodium album). Proceedings of the 5th Arab Congress of Plant Protection, November 27-December 2, 1994, Fes, Marocco. -.

Qasem, J.R., 1994. Competition effect and nutrient accumulation of cabbage (Brassica oleracea var. Capitata) and fat-hen (Chenopodium album). Advances Horti. Sci., 8: 191-194.

Qasem, J.R., 1995. Allelopathic effect of Amaranthus retroflexus and Chenopodium murale on vegetable crops. Allelopathy J., 2: 49-66.

Qasem, J.R., 1995. Critical period of weed interference in snap bean (Phaseolus vulgaris). Advances Hortic. Sci., 9: 23-26.

Qasem, J.R., 1995. The allelopathic effects of three Amaranthus spp. (pigweeds) on wheat (Triticum durum). Weed Res., 35: 41-49.
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Qasem, J.R., 1996. Aqueous extract effects of some common weed species against certain plant pathogenic fungi. ACTES, 16: 11-19.

Qasem, J.R., 1996. Biological activity of buttercup (Ranunculus arvensis). Proceedings of the 1st World Congress on Allelopathy, a Science for the Future, September 16-20, 1996, Cadiz, Spain. -.

Qasem, J.R., 1996. Chemical weed control in garlic (Allium sativum L.) in Jordan. Crop Protect., 15: 21-26.
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Qasem, J.R., 1996. Fungicidal activity of extracts of Ranunculus asiaticus and other weeds against Fusarium oxysporum f. sp. lycopersici. Ann. Applied Biol., 128: 533-540.
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Qasem, J.R., 1996. Fungitoxicity of weed extracts to tomato wilt pathogen (Fusarium oxysporum f. sp. lycopersici). Emirates J. Agric. Sci., 8: 103-112.

Qasem, J.R., 1996. Plants as natural sources of herbicides against broomrape (Orobanche ramosa L) parasitic weed. Proceedings of the 4th Jordanian Scientific Week. August 28-September 4, 1996, Amman, Jordan. -.

Qasem, J.R., 1996. Weed competition in garlic (Allium sativum L.). J. Hortic. Sci., 71: 41-48.

Qasem, J.R., 1997. Common herbs in the capital amman, their ecological importance and coservation. Proceedings of the Department of Gardens Workshop on Wild Flowers and Herbs, June 16, 1997, Amman, Jordan. -.

Qasem, J.R., 1997. Competitive ability of Amaranthus retroflexus and Chenopodium murale and its effect on tomato growth. Dirasat, 24: 96-112.
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Qasem, J.R., 1997. Medicinal herbs of Jordan, Species and Their Medicinal use. Proceedings of the 2nd Arab Congress on Plants and Medicinal Herbs in the Arab World, November 25-27, 1997, Khartoum, Sudan. -.

Qasem, J.R., 1997. Medicinal herbs of jordan, species and their medicinal use. Proceedings of the 2nd Arab Congress on Plants and Medicinal Herbs in the Arab World. November 25-27, 1997, Khartoum, Sudan. -.

Qasem, J.R., 1998. Chemical control of branched broomrape (Orobanche ramosa) in glasshouse grown tomato. Crop Prot., 17: 625-630.

Qasem, J.R., 1999. Research on Allelopathy in Jordan. In: Allelopathy Update, Narwal, S.S., (Ed.)., Science Publishers, Inc., New Hampshire, USA, pp: 221-246..

Qasem, J.R., 2000. Chemical control of mesquite (Prosopis fracta) in Jordan Valley. Proceedings of 7th Arab Congress of Plant Protection, October 22-26, 2000, Amman, Jordan -.

Qasem, J.R., 2001. Allelopathic potential of White top and Syrian sage on vegetable crops. Agron. J., 93: 64-71.
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Qasem, J.R., 2002. Allelopathic effects of selected medicinal plants on Amaranthus retroflexus and Chenopodium murale. Allelopathy J., 10: 105-122.

Qasem, J.R., 2002. Plants as Sources of Natural Herbicides against Branched Broomrape (Orobanche ramosa L.). In: Alleopathy, From Molecule to Ecosystem, Reigosa, M.J. and N. Pedrol (Eds.)., Science Publisher, Inc., Enfield, USA, pp: 153-182.

Qasem, J.R., 2003. Weeds and Their Control (Laboratory Part). University of Jordan Publications, Amman, Jordan, Pages: 66.

Qasem, J.R., 2003. Weeds and Their Control. University of Jordan Publications, Amman, Jordan, Pages: 628.

Qasem, J.R., 2004. Osyris alba occurrence in Jordan, new hosts and importance. Proceeding of the 4th International Weed Science Congress, June 20-24, 2004, Durban, South Africa, pp: 98-98.

Qasem, J.R., 2004. Allelopathic effects of cucumber (Cucumis sativus L. cv. Iba') on certain common weed species in Jordan. Proceeding of the 4th International Weed Science Congress, June 20-24, 2004, Durban, South Africa, pp: 95-95.

Qasem, J.R., 2004. Allelopathic plants, Cardaria draba (L.) Desv. Allelopathy J., 13: 165-172.

Qasem, J.R., 2004. Phytotoxic activity of some common weed species on certain vegetable crops grown in Jordan. Proceeding of the 15th International Plant Protection Congress, May 11-16, 2004, The First Gathering for Plant Protection in the 21st Century, Beijing, China, -.

Qasem, J.R., 2005. Chemical control of weeds in onion (Allium cepa L.). J. Hortic. Sci. Biotechnol., 80: 721-726.

Qasem, J.R., 2005. Critical period of weed competition in onion (Allium cepa L.) in Jordan. Jordan J. Agric. Sci., 1: 32-42.

Qasem, J.R., 2006. Chemical weed control in seedbed sown onion (Allium cepa L.). Crop Prot., 25: 618-622.
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Qasem, J.R., 2006. Host range of the parasitic weed Osyris alba L. in Jordan. Weed Biol. Manage., 6: 74-78.
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Qasem, J.R., 2006. Parasitic Weeds and Allelopathy, from the Hypothesis to the Proof. In: Allelopathy, A Physiological Process with Ecological Implications, Reigosa, M.J. and N. Pedrol and L. Gonzalez (Eds.)., Springer, The Netherlands, pp: 565-637.

Qasem, J.R., 2006. The response of onion (Allium cepa L.) plants to fertilizers, weed competition duration and planting times in the central Jordan Valley. Weed Biol. Manage., 6: 212-220.
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Qasem, J.R., 2007. Allelopathic Activity of White Rocket (Diplotaxis erucoides). In: Allelopathy: New Concepts and Methodology, Fujii, Y. and S. Hiradate (Eds.)., Science Publishers, NH, USA, pp: 139-163.

Qasem, J.R., 2007. Allelopathy in plant protection: A review of the last two decades research achievements under field conditions. Proceding of the International Conference on Role of Allelopathy in Sustainable Agriculture, March 22-24, 2007, University of Arid Agriculture, Rawalpindi, Pakistan, pp: 25-26.

Qasem, J.R., 2007. Chemical control of Prosopis farcta (Banks and Sol.) Macbirde in the Jordan Valley. Crop Protect., 26: 572-575.
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Qasem, J.R., 2007. Chemical control of wild-oat (Avena sterilis L.) and other weeds in wheat (Triticum durum Desf.) in Jordan. Crop Protect., 26: 1315-1324.
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Qasem, J.R., 2007. On the differences in allelopathy results between laboratory and glasshouse experiments. Proceeding of the International Workshop on Allelopathy-Current Trends and Future Applications, March 18-21, 2007, University of Agriculture, Faisalabad, Pakistan, pp: 42-42.

Qasem, J.R., 2007. Poisnous wild plants in Jordan: species and their economical and ecological importance. Proceeding of the Regional and Scientific Exhibition on the Medicinal, Aromatic and Poisnous Plants, April 16-18, 2007, Sana'a University, Republic of Yemen, pp: 34-34.

Qasem, J.R., 2007. Weed control in cauliflower (Brassica oleracea var. Botrytis L.) with herbicides. Crop Protect., 26: 1013-1020.
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Qasem, J.R., 2008. Allelopathy: From field observation to laboratory and glasshouse experiments. Proceedings of 5th World Congress on Allelopathy, September 21-25, 2008, Saratoga Springs, New York, USA -.

Qasem, J.R., 2008. Dodder (Cuscuta spp.) Occurrence and natural hosts in Jordan. Korean J. Weed Sci., 28: 343-359.
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Qasem, J.R., 2008. Joint-pine (Ephedra alata Decne), an invasive weed and a real threat to certain forest and fruit trees in Jordan. Proceedings of 5th IWSS Congress, June 23-27, 2008, Vancouver, Canada, pp: 85-85.

Qasem, J.R., 2008. Mistletoes (Viscum cruciatum Siebr. ex Boiss. and Loranthus acaciae Zucc) and their hosts in Jordan. Proceedings of 5th IWSS Congress, June 23-27, 2008, Vancouver, Canada, pp: 75-75.

Qasem, J.R., 2008. Parasitic weeds of the Orobanchaceae family and their natural hosts in Jordan. Proceedings of 5th IWSS Congress, June 23-27, 2008, Vancouver, Canada, pp: 75-75.

Qasem, J.R., 2009. Allelopathy field application and potential role in pest management. Proceedings of 1st Conference of Asian Allelopathy Society, December 18-22, 2009, South China University, Guangzhou, China -.

Qasem, J.R., 2009. An updated inventory of mistletoe (Plicosepalus acaciae and Viscum cruciatum) distribution in Jordon, hosts and severity of infestation. Weed Technol., 23: 465-469.
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Qasem, J.R., 2009. Parasitic weeds of the orobanchaceae family and their natural hosts in Jordan. Weed Biol. Manage., 9: 112-122.
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Qasem, J.R., 2009. Parasitic weeds, a possible threat to fruit and forest trees in Jordan. Proceedings of 10th World Congress on Parasitic Weeds, June 8-12, 2009, Kusadasi, Turkey -.

Qasem, J.R., 2009. Weed competition in cauliflower (Brassica oleracea L. var. botrytis) in the Jordan Valley. Sci. Hortic., 121: 255-259.
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Qasem, J.R., 2010. Allelopathy importance, field application and potential role in pest management: A review. J. Agric. Sci. Technol., 4: 104-120.

Qasem, J.R., 2010. Competitive relationship of cauliflower (Brassica oleracea L. var. Botrytis) and nettle-leaved goosefoot (Chenopodium murale L.) and their differential responses to potassium level. J. Plant Nutrit., 33: 2135-2147.
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Qasem, J.R., 2010. Differences in the allelopathy results from field observation to laboratory and glasshouse experiments. Allelopathy J., 26: 45-58.
Direct Link  |  

Qasem, J.R., 2010. Parasitic flowering plants in Jordan, the present status and possible management. Proceedings of 22nd Asian-Pacific weed Science Society Conference, March 8-12, 2010, Lahore, Pakistan -.

Qasem, J.R., 2010. Parasitic flowering plants on cultivated plants in Jordan-the present status and possible management. Pak. J. Weed Sci., 16: 227-239.
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Qasem, J.R., 2010. Weed control in field crops. Proceedings of National Center for Research and Technology Transfer, March 17, 2010, Training Course, Amma, Jordan -.

Qasem, J.R., 2011. Fungitoxic properties of scarlet pimpernel (Anagallis arvensis) against Helminthosporium sativum and Fusarium oxysporum. Allelopathy J., 28: 251-258.
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Qasem, J.R., 2011. Parasitic flowering plants of woody species in Jordan. Eur. J. Plant Pathol., 131: 143-155.
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Qasem, J.R., 2011. Weed Management in Wheat. Wheat: Genetics, Crops and Food Production. In: Agriculture Issues and Policies, Almeida, M.T. (Ed.)., Nova Science Publishers, USA, pp: 1-79.

Qasem, J.R., A.S. Al-Abed and H.A. Abu-Blan, 1995. Antifungal activity of Clammy inula (Inula viscosa L.) on Helminthosporium sativum and Fusarium oxysporum. Phytopathol. Mediterr., 34: 7-14.

Qasemk, J.R., 2000. Chemical control of wild oat (Avena sterilis) in wheat. Proceedings of 7th Arab Congress of Plant Protection, October 22-26, 2000, Amman, Jordan -.

Qasim, J.R., 1982. The competitive and allelopathic effects and chemical control of Syrian sage (Salvia syriaca L.) in wheat. M.Sc. Thesis, University of Jordan, Amman, Jordan..

Sadaqa E.A., A.A. Bawazir and J.R. Qasem, 2010. Allelopathic activity of some common weeds species in onion fields. Allelopathy J., 26: 175-184.
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Sadaqa, E.A., A.A. Bawazir and J.R. Qasem, 2008. Weed management in onion (Allium cepa L.) grown from seeds. Yemen J. Agric. Res., 25: 51-67.

Sadaqa, E.A., A.A. Bawazir and J.R. Qasem, 2008. Weed management in transplanted onion (Allium cepa L.) by soil solarization, herbicides and hoeing. Yemen J. Agric. Res., 27: 7-33.