Juan J Nunez

Farm Advisor, Emeritus (Retired)

Cooperative Extension Kern County
1031 South Mount Vernon Avenue
Bakersfield, CA 93307
jnunez@ucanr.edu

http://cekern.ucanr.edu

Education

M.S. Plant Science, California State University, Fresno. 1991

B.S. Biology, California Polytechnic University, San Luis Obispo. 1982

A.S. Life Science, Bakersfield College. 1978

Specialty

Areas of Expertise (click to see all ANR academics with this expertise)

• Carrots
• Potatoes, Irish
• Tomatoes - Processing
• Onions
• Plants and Their Systems
• Plant Management Systems
• Pathogens and Nematodes Affecting Plants

Bibliography

Peer Reviewed

• Simon, P.; Navazio, J., et al.; Colley, M.; Hoagland, L.; Roberts, P.; Du Toit, L.; Waters, T.; Silva, E.; Colquhoun, J.; Nunez, J.; McCluskey, C.; Zystro, J. (2013). Location, Cropping System, and Genetic Background Influence Carrot Performance Including Top Height and Flavor in the Cioa (Carrot Improvement for Organic Agriculture) Project. 2013 ASHS Annual Conference.
• Simon, P.; Navazio, J., et al.; Colley, M.; Hoagland, L.; Roberts, P.; Du Toit, L.; Waters, T.; Silva, E.; Colquhoun, J.; Nunez, J.; McCluskey, C.; Zystro, J. (2013). Location, Cropping System, and Genetic Background Influence Carrot Performance Including Top Height and Flavor in the Cioa (Carrot Improvement for Organic Agriculture) Project, Abstract. ASHS Annual Conference.
• Becker, J.; Ploeg, A., et al.; Nunez, J. (2012). Evaluation of novel products for root knot nematode management in tomato, 2011. Plant Diseases Management Report. 6, N016.
• Lu, X.; Davis, R., et al.; Livingston, R.; Nunez, J.; Hao, J. (2012). "Fungicide sensitivity of Pythium species associated with cavity spot of carrot in California and Michigan." Plant Disease 96: 384-388.
• Nunez, J. (2012). Management of Important Soilborne Diseases. Tomato Health Management.R. Davis, K. Pernezny and J. Bromme. St. Paul, Minnesota, APS Press.
• Farrar, J.; Nunez, J., et al.; Davis, R. (2009). "Losses due to lenticel rot are an increasing concern for Kern County potato growers." California Agriculture 63(3): 127-130.
• Miller, J.; Hirnyck, R., et al.; Downey-Blecker, L.; Nunez, J. (2008). Organic Potato Pest Management Strategic Plan (PMSP).D. Clarke. http://www.ipmcenters.org/pmsp/pdf/CA-CO-ID-OR-WAOrganicPotatoPMSP.pdf
• Davis, R.; Hao, J., et al.; Romberg, M.; Nunez, J.; Smith, R. (2007). "Efficacy of germination stimulants of sclerotia of Sclerotium cepivorum for management of white rot of garlic." Plant Disease 91: 204-208.
• Davis, R.; Nunez, J. (2007). Integrated Approach for Carrot Pest and Disease Management. General Concepts in Integrated Pest and Disease Management.A. Ciancio and K. Mukerji. Netherlands, Springer.: 149-188.
• Zheng, W.; Yates, S., et al.; Papiernik, S.; Nunez, J. (2006). "Conversion of metam sodium and emission of fumigant from soil columns." Atmospheric Environment 40: 7046-7056.
• Johnstone, P.; Hartz, T., et al.; LeStrange, M.; Nunez, J.; Miyao, E. (2005). "Managing Fruit Soluble Solids with Late-Season Deficit Irrigation in Drip-irrigated Processing Tomato Production." HortScience 40(6)
• Romberg, M.; Nunez, J., et al.; Farrar, J. (2004). "First report of powdery mildew on potato caused by Golovinomyces cichoracearum in California." Plant Disease 88: 309.
• Hartz, T.; Johnstone, P., et al.; Nunez, J. (2004). "Production environment and nitrogen fertility affect carrot cracking." HortScience 40: 611-615.
• Ogbuchiekwe, E.; McGiffen, M., et al.; Nunez, J.; Fennimore, S. (2004). "Tolerance of carrot to low-rate pre-emergent and post-emergent herbicides." HortScience 39(2)
• Aegerter, B.; Nunez, J., et al.; Davis, R. (2003). "Environmental factors affecting rose downy mildew and development of a forecasting model for nursery production system." Plant Disease 87: 732-738.
• Koike, S.; Nunez, J., et al.; Falk, B. (2002). Carrot Motley Dwarf. Compendium of Umbelliferous Crop Disease.R. Davis. St. Paul, Minnesota, APS Press.: 51-52.
• Nunez, J.; Falk, B. (2002). Carrot Thin Leaf. Compendium of Umbelliferous Crop Disease.R. Davis. St. Paul, Minnesota, APS Press.: 52.
• Nunez, J.; Westphal, A. (2002). Damping-Off. Compendium of Umbelliferous Crop Disease.R. Davis. St. Paul, Minnesota, APS Press.: 31-33.
• Aegerter, B.; Nunez, J., et al.; Davis, R. (2002). "Detection and management of downy mildew in rose rootstock." Plant Disease 86: 1363-1368.
• Nunez, J.; Gilbertson, R., et al.; Meng, X.; Davis, R. (2002). "First report of Xanthomonas leaf blight of onion in California." Plant Disease 86: 330.
• Nunez, J. (2002). Iron Deficiency. Compendium of Umbelliferous Crop Disease.R. Davis. St. Paul, Minnesota, APS Press.: 64.
• Farrar, J.; Nunez, J., et al.; Davis, R. (2002). "Repeated soil applications of fungicide reduce activity against cavity spot in carrots." California Agriculture 56: 76-79.
• Pryor, B.; Strandberg, J., et al.; Davis, R.; Nunez, J.; Gilbertson, R. (2002). "Survival and persistence of Alternaria dauci in carrot cropping systems." Plant Disease 86(1115-1122)
• Koike, S.; Smith, R., et al.; Davis, R.; Nunez, J.; Voss, R. (2001). "Characterization and control of garlic rust in California." Plant Disease 85: 585-591.
• Koike, S.; Smith, R., et al.; Davis, R.; Nunez, J.; Voss, R. (2001). "Rust disease continues to threaten California garlic crop." California Agriculture 55(5)
• Santos, P.; Nunez, J., et al.; Davis, R. (2000). "Influence of gibberillic acid on carrot growth and severity of Alternaria leaf blight." Plant Disease 84: 555-558.
• Farrar, J.; Nunez, J., et al.; Davis, R. (2000). "Influence of soil saturation and temperature on Erwinia chrysanthemi soft rot of carrots." Plant Disease 84: 665-668.
• Davis, R.; Sorensen, E., et al.; Nunez, J. (1999). Importance of Pesticides and Other Pest Management Practices in U.S. Carrot Production. UCD Cooperative Extension Plant Pathology. National Agricultural Pesticide Impact Assessment Program. Document 99-007.
• Davis, R.; Nunez, J. (1999). "Influence of crop rotation on the incidence of Pythium and Rhizoctonia induced root dieback." Plant Disease 83: 148-149.
• Voss, R.; Phillips, H., et al.; Brittan, K.; Carlson, H.; Garrison, N.; Gaskell, M.; Jimenez, M.; Kirby, D.; Molinar, R.; Nunez, J.; Smith, R.; Valencia, J.; VeerKamp, G. (1999). "New specialty potato varieties give farmers growing and marketing options." California Agriculture 53(6)
• Nunez, J. (1999). Potato Crop Profile for California. http://ipmwww.ncsu.edu/opmpniap/subcrp.htm
• Davis, R.; Wang, H., et al.; Falk, B.; Nunez, J. (1998). "Curly top virus found in perennial shrubs in foothills." California Agriculture 52: 38-40.
• Davis, R.; Nunez, J., et al.; Sorensen, E. (1998). U.S. Carrot Crop Profile. http://pestdata.ncsu.edu/cropprofiles/docs/uscarrots.html
• Davis, R.; Nunez, J., et al.; Subbarao, K. (1997). "Benefits of cotton seed treatments for the control of seedling diseases in relation to inoculum densities of Pythium species and Rhizoctonia solani." Plant Disease 81: 766-768.
• McGiffen, M.; Suslow, T., et al.; Nunez, J.; Mayberry, K. (1997). Carrot Production in California. UC ANR. Publication 7226.
• Santos, P.; Davis, R., et al.; Nunez, J. (1997). "Use of gibberillic acid for the control of Alternaria leaf blight of carrot." Phytopathology 87: S85.
• Davis, R.; Nunez, J., et al.; Vargas, R.; Weir, B.; Wright, S.; Munier, D. (1996). "Metam-sodium kills beneficial soil fungi as well as cotton pests." California Agriculture 50: 42-44.
• Schrandt, J.; Davis, R., et al.; Nunez, J. (1994). "Host range and influence of nutrition, temperature, and pH on growth of Pythium violae from carrot." Plant Disease 78: 335-338.
• Davis, R.; Nunez, J. (1994). "Influence of soil temperature and microflors on the incidence of Pythium-induced root dieback of carrot." Phytopathology 84: 1345.
• Nunez, J.; Davis, R. (1993). "Carrot cultivar screening for the control of cavity spot and black rot." Biological and Cultural Tests for Control of Plant Diseases 8: 18.
• Schrandt, J.; Nunez, J., et al.; Davis, R. (1992). "Host range and nutritional requirements of Pythium violae, the cause of cavity spot of carrot." Phytopathology 82: 1092.
• Davis, R.; Nunez, J., et al.; Guerard, J.; Vivoda, E. (1991). "If registered, fungicide could reduce cavity spot of carrots." California Agriculture 45: 29-30.
• Vivoda, E.; Davis, R., et al.; Nunez, J.; Guerard, J. (1990). "Factors effecting the development of cavity spot of carrots." Plant Disease 75: 519-522.
• Liddel, C.; Davis, R., et al.; Nunez, J.; Guerard, J. (1989). "Association of Pythium spp. with carrot root dieback in the San Joaquin Valley of California." Plant Disease 73: 246-249.

Non-Peer Reviewed

• Nunez, J. (2014). Flea Beetings in Carrots. Vegetables West. 18. February 2014.
• Nunez, J. (2014). Foliar Diseases of Carrots. Vegetables West. 18. September/October 2014.
• Nunez, J. (2014). Irrigating Vegetables in a Drought. Vegetables West. 18. May 2014.
• Nunez, J. (2014). New Nematicide Field Test. Vegetables West. 18. November/December 2014.
• Nunez, J. (2012). Cavity Spot. Vegetable Growers News. 46:3. March.
• Nunez, J. (2012). Kern County Potato Field Day. Vegetables West. 16:6.
• Nunez, J. (2012). Soft Rot of Potatoes. Vegetables West. 16:8.
• Nunez, J. (2011). Air Pollution. Western Farm Press. June 18.
• Nunez, J.; Hatz, et al.; Suslow, T.; McGiffen, M.; Natwick (2011). Carrot Production in California. Carrot Country. Fall.
• Nunez, J.; Liberman, L. (2011). Colored Mulches Have Their Advantages (Interview). Vegetable Growers News. February.
• Davis, R.; Nunez, J. (2011). Development of Suppressive Soils for Cavity Spot. Vegetables West. April.
• Henderson; Natwick, et al.; Aegerter, B.; Nunez, J. (2011). Iris Yellow Spot in Onions. Vegetables West. March.
• Nunez, J. (2011). Mulch Repel Pests. American Vegetable Grower. January.
• Nunez, J. (2011). Preventing Carrot Diseases Should Start with Clean Soil. Ag Alert. February 2.
• Nunez, J. (2011). Southern Blight of Tomatoes. American Vegetable Grower. September.
• Nunez, J. (2010). Bacterial Early Dying of Potatoes. American Vegetable Grower. April.
• Nunez, J. (2010). Bacterial Onion Diseases. Western Farm Press. February 20.
• Nunez, J. (2010). Carrot/Potato Research. Vegetables West. 14:4.
• Nunez, J. (2010). Foliar Diseases of Carrots. Vegetables West. November/December.
• Henderson; Natwick, et al.; Aegerter, B.; Nunez, J. (2010). Iris Yellow Spot in Onions. CAPCA Adviser. December.
• Nunez, J. (2010). Kern County Carrot Variety Trial. Vegetables West. 14:1.
• Nunez, J. (2010). Lenticel Rot of Potatoes. Vegetables West. 14:1.
• Nunez, J. (2010). Nematode Control with Alternative Materials. Carrot Country. Fall.
• Nunez, J. (2010). Southern Blight of Tomatoes. Western Farm Press. August 21.
• Nunez, J. (2010). Use of Gibberillic Acid for Control of Alternaria Leaf Blight. Carrot Country. Summer.
• Nunez, J. (2009). Biological Soil Disinfestation: New Method for Control of Soil Borne Pathogens. Vegetables West. 13:3. March.
• Nunez, J. (2009). Blackmold of Tomatoes. American Vegetable Grower. March.
• Nunez, J. (2009). Blackmold of Tomatoes. Vegetables West. 13:5. May.
• Nunez, J. (2009). Control of CMV of Peppers with Insect Repellents. Vegetables West. 13:2. February.
• Nunez, J. (2009). Nematode Control with Alternative Materials. Carrot Country. Summer.
• Nunez, J. (2009). Nematodes in the Vegetable Garden. Bakersfield Californian. October 17.
• Nunez, J. (2009). Scab Diseases of Potato. Vegetables West. 13:1. January.
• Nunez, J. (2009). Weather Impact on Diseases of Vegetables. Vegetables West. 13:9.
• Nunez, J. (2008). Control of CMV of Peppers with Insect Repellents. American Vegetable Grower. November.
• Nunez, J. (2008). Development and Evaluation of New Carrot Cultivars for California at Winter Nursery. Carrot Country. Summer.
• Nunez, J. (2008). White Rot Research. Vegetables West. 12:4.
• Nunez, J. (2007). Asparagus Purple Spot. American Vegetable Grower. 55:3. March.
• Nunez, J. (2007). Kern County Potato Variety Trial. Vegetables West. 11:6. June.
• Nunez, J. (2007). Potato Scab. Vegetables West. 11:6. June.
• Nunez, J. (2007). Seed Corn and Onion Maggot Control. Vegetables West. 11:6. June.
• Nunez, J. (2007). Use of Anti-Microbial Agents to Control Potato Infections. Vegetables West. 11:8. September/October.
• Nunez, J. (2007). Varnish Spot of Lettuce. Vegetables West. 11:4. April.
• Nunez, J. (2006). Blossom-end Rot. Western Farm Press. April 1.
• Nunez, J. (2006). Carrot Production. Carrot Country. Summer.
• Nunez, J. (2006). Metam Sodium Degradation. Vegetables West. 10:1. January.
• Nunez, J. (2006). Mustard Cover Crop. Vegetables West. 10:1. January.
• Nunez, J. (2006). Pepper Stip. Ag Alert. June 21.
• Nunez, J. (2006). Seedling Disease II. Western Farm Press. January 21.
• Nunez, J. (2006). Seedling Disease II. American Vegetable Grower. 24. March.
• Nunez, J. (2006). Seedling Disease II. Vegetables West. 10:3. March.
• Nunez, J. (2006). Viruses of Cucurbits. Vegetables West. 10:5. May.
• Nunez, J. (2005). Grower Tip of the Month. American Vegetable Grower. 25. November 3.
• Nunez, J. (2005). Keep Onions Disease Free. American Vegetable Grower. August.
• Nunez, J. (2005). Kern County Potato Variety Selection and Development. Vegetables West. 9:5.
• Westerdahl, R.; Nunez, J., et al.; Radewald, J. (2005). Management of Root-knot Nematode on Carrots. Vegetables West. 9:4. April.
• Nunez, J. (2005). Pythium, Rhizoctonia, Usual Veggie Fungi. Western Farm Press. March 12.
• Nunez, J.; Davis, R., et al.; Farrar, J. (2004). Erwinia Early Dying of Potato. Vegetables West. 8:8. August.
• Nunez, J. (2004). Identificacion de la Sarna de la Papa. Productores de Hortalizas. 13:5. May.
• Hartz, T.; Cahn, M., et al.; LeStrange, M.; Nunez, J. (2004). Managing soluble solids with drip irrigation. California Tomato Grower.
• Nunez, J. (2004). Onion Diseases. Ag Alert. March 10.
• Nunez, J. (2004). Potato Scab. American Vegetable Grower. 40-41. March 2004.
• Nunez, J. (2004). Seeding Diseases. Vegetables West. 8:8. August.
• Nunez, J. (2004). Tomato Late Blight Control. The Farm Press. February 21.
• Nunez, J. (2003). Potato Bacterial Early Dying. Vegetables West. 7:3. March.
• Nunez, J. (2002). Mustard as a Green Manure Crop. Western Farm Press. March 15.
• Nunez, J. (2002). Staying on Top of Late Blight. Western Farm Press. 24:4. February.
• Nunez, J. (2001). 29th International Carrot Conference Coming to California in 2002. November.
• Nunez, J. (2001). Charcoal Rot Noticed in Kern County Potato Fields. June.
• Nunez, J. (2001). History of Late Blight. Western Farm Press. February 3.
• Nunez, J. (2001). Onions in Antelope Valley Suffer from Unknown Blight. Western Farm Press. August.
• Nunez, J. (2001). Seedling Disease of Onion and Garlic. Vegetables West. 5:4.
• Nunez, J. (2001). Seedling Diseases of Vegetables. Vegetables West. 5:5. February.
• Nunez, J. (2000). Bulb mites. Bakersfield Californian. August 6.
• Nunez, J.; Davis, R. (2000). Fighting Leaf Blight with Plant Hormones. Carrot Country. Fall.
• Nunez, J. (2000). Iron Deficiency in Vegetables. Western Farm Press. November 4.
• Nunez, J. (2000). Postharvest Chloroination of Potatoes. Western Farm Press. February 19.
• Nunez, J. (2000). Purple Spot of Asparagus. Vegetables West. 4:2.
• Nunez, J. (2000). Soft Rot of Carrots. May.
• Nunez, J. (2000). Spider Mites of Carrots. Bakersfield Californian. August 6.
• Nunez, J. (2000). Spider Mites of Carrots. Western Farm Press. September 16.
• Nunez, J. (1999). Alternaria Leaf Blight in Carrots. Vegetables West. 3:11. November.
• Nunez, J. (1999). Alternaria Leaf Blight in Carrots. California Vegetable. 5:3.
• Nunez, J. (1999). Bacterial disease of onion. California-Arizona Farm Press. 21:10. March.
• Nunez, J. (1999). Crop rotations as a method of disease control. Bakersfield Californian. July.
• Nunez, J. (1999). Crop rotations as a method of disease control. California Vegetables. 4:5. October.
• Nunez, J. (1999). New methods of combating white rot being investigated. California-Arizona Farm Press. 21:8. January.
• Nunez, J. (1999). Once again growers need to be on the lookout for late blight. California-Arizona Farm Press. February.
• Nunez, J. (1999). Producing and shipping quality potatoes. Vegetables West. February.
• Nunez, J. (1999). Summer planting of potatoes. Bakersfield Californian. September.
• Nunez, J. (1999). Summer planting of potatoes. Western Farm Press. September 4.
• Nunez, J. (1998). Bacterial soft rot of onions. March.
• Nunez, J. (1998). Garlic rust. California-Arizona Farm Press. 20:17. May.
• Nunez, J. (1998). Garlic rust. The Farm News. 4:6.
• Koike, S.; Smith, R., et al.; Davis, R.; Nunez, J. (1998). Garlic rust outbreak in California. http://vric.ucdavis.edu
• Nunez, J.; Davis, R., et al.; Teviotdale, B.; Goodell, N. (1998). Garlic seed piece treatments for the control of Penicillium decay. National Onion (and other Allium) Research Conference.
• Nunez, J. (1998). Models may help with disease control. California-Arizona Farm Press. March 14.
• Nunez, J. (1998). Steamed veggies not always good. October.
• Nunez, J. (1998). Varnish spot of crisphead lettuce. The Farm News. 44:9. September.
• Nunez, J. (1997). Cultural control of late blight. The Farm News. 43:2. January.
• Nunez, J. (1997). Cultural control of late blight. Ag Alert. February.
• Nunez, J. (1997). Cultural control of late blight. California-Arizona Farm Press. March.
• Nunez, J. (1997). Effects of weather on vegetable disease development. The Fresno Bee. November.
• Nunez, J. (1997). Kern carrots affected by virus. California-Arizona Farm Press. 19:20. July.
• Nunez, J. (1997). Kern carrots affected by virus. The Farm News. 43:8. July.
• Nunez, J. (1997). Late blight prevention begins early. The Farm News. 44:12. September.
• Nunez, J. (1997). Potato wilt syndrome. California-Arizona Farm Press. 19:12. May.
• Nunez, J. (1997). Producing and shipping quality potatoes. California-Arizona Farm Press. 19:8. March.
• Nunez, J. (1997). Proper Applications of Metam-Sodium. California Vegetable Journal. 3:1. December.
• Nunez, J. (1997). Root dieback of carrots. Ag Alert. February.
• Nunez, J. (1996). Cultural practices can help reduce early and late blight of problems. California-Arizona Farm Press. 19:2. November.
• Nunez, J. (1996). Foliar diseases of carrots. California Farmer. May.
• Nunez, J. (1996). Foliar diseases of carrots. California-Arizona Farm Press. 18:14.
• Nunez, J. (1996). Foliar diseases of carrots. American Vegetable Grower. October.
• Nunez, J.; Voss, R. (1996). Late Blight. Vegetable Research and Information Center. http://vric.ucdavis.edu
• Nunez, J. (1996). Looking out for cucurbit viruses. California-Arizona Farm Press. 18:16. May.
• Nunez, J. (1996). Reducing Sclerotina lettuce drop. California-Arizona Farm Press. 18:16. August.
• Nunez, J. (1996). Reducing Sclerotina lettuce drop. California Farmer.
• Nunez, J. (1996). Root dieback of carrots. California-Arizona Farm Press. 18:23. October.
• Nunez, J. (1996). Second late blight chemical gets section 18 permit. Central Valley Farmer. March 21.
• Nunez, J. (1996). Second late blight chemical gets section 18 permit. Ag Alert. July 24.
• Nunez, J. (1996). White rot found in Kern County onion fields. California-Arizona Farm Press. 18:16. July.

ANR Workgroup Associations

• Pest Management in ANR - Member
• Plant Pathology - Member
• Vegetable Crops - Member
• Warm Season Vegetables - Member

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